CVE-2026-53633

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-15. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Elevated

Also known asEUVD-2026-44403 (ENISA EUVD) · GHSA-g8mr-85jm-7xhm (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.9%CVSS: 9.8Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Vitest is a testing framework powered by Vite. From 3.0.0 until 3.2.5, 4.1.8, and 5.0.0-beta.4, Vitest Browser Mode exposed a cdp() API that forwarded raw Chrome DevTools Protocol methods without being gated by allowWrite or allowExec, allowing a remote client with exposed browser API metadata to use CDP Page.setDownloadBehavior and Runtime.evaluate to overwrite vite.config.ts and execute attacker-controlled Node.js code. This issue is fixed in versions 3.2.5, 4.1.8, and 5.0.0-beta.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.9%
EPSS %ILE
60th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.9% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 15, 2026

Last Modified

October 24, 2026

Advisory Details (10)

Auto-updated Nov 9, 2026
Patch available. Sources: github_commit, github_pr, github_release.
GitHub release Patch Available

v5.0.0-beta.4

Patch available: vitest-dev/vitest v5.0.0-beta.4 (pre-release)

https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-beta.4
GitHub release Patch Available

v4.1.8

Patch available: vitest-dev/vitest v4.1.8

https://github.com/vitest-dev/vitest/releases/tag/v4.1.8
GitHub release Patch Available

v3.2.5

Patch available: vitest-dev/vitest v3.2.5

https://github.com/vitest-dev/vitest/releases/tag/v3.2.5
GitHub pull request Patch Available

fix(browser): disable client `cdp` API when `allowWrite/allowExec: false` [backport to v3]

Patch available: vitest-dev/vitest v3.2.5 (PR #10456 merged 2026-05-28)

https://github.com/vitest-dev/vitest/pull/10456
GitHub pull request Patch Available

fix(browser): disable client `cdp` API when `allowWrite/allowExec: false` [backport to v4]

Patch available: vitest-dev/vitest v4.1.8 (PR #10450 merged 2026-05-28)

https://github.com/vitest-dev/vitest/pull/10450
GitHub pull request Patch Available

fix(browser): disable client `cdp` API when `allowWrite/allowExec: false`

Patch available: vitest-dev/vitest v5.0.0-beta.4 (PR #10444 merged 2026-05-28)

https://github.com/vitest-dev/vitest/pull/10444
GitHub commit Patch Available

commit e4067b3b1500 (vitest-dev/vitest)

Patch available: vitest-dev/vitest v4.1.8 (contains commit e4067b3b1500)

https://github.com/vitest-dev/vitest/commit/e4067b3b150005fd42cf75f994300119245806b9
GitHub commit Patch Available

commit 63e3b2eee4d5 (vitest-dev/vitest)

Patch available: vitest-dev/vitest v5.0.0-beta.4 (contains commit 63e3b2eee4d5)

https://github.com/vitest-dev/vitest/commit/63e3b2eee4d58da56786a6333f517b9b492528c7
GitHub commit Patch Available

commit 385a1aefd4c2 (vitest-dev/vitest)

Patch available: vitest-dev/vitest v3.2.5 (contains commit 385a1aefd4c2)

https://github.com/vitest-dev/vitest/commit/385a1aefd4c2bfa5e7d58bf7c6834c929969f2c7
GitHub advisoryMentions a patch (unverified)🟡 PoC Available

Exposed Browser Mode API Can Proxy CDP and Overwrite Config Files, Leading to RCE · Advisory · vitest-dev/vitest · GitHub

https://github.com/vitest-dev/vitest/security/advisories/GHSA-g8mr-85jm-7xhm

Vendor Advisories for CVE-2026-53633(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
npmvite-plus @ 0.1.24 (fixes <= 0.1.23)—ghsa
npm@vitest/browser @ 5.0.0-beta.4 (fixes >= 5.0.0-beta.0, <= 5.0.0-beta.3)—ghsa
npm@vitest/browser @ 4.1.8 (fixes >= 4.0.0, <= 4.1.7)—ghsa
npm@vitest/browser @ 3.2.5 (fixes >= 3.0.0, <= 3.2.4)—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(2 across 1 ecosystem)
npm(2)
PackageVulnerable rangeFix by version rangeDependents
vite-plus—
  • every version up to 0.1.24: fixed in 0.1.24
—
@vitest/browser—
  • 5.0.0-beta.0 up to 5.0.0-beta.4: fixed in 5.0.0-beta.4
  • 4.0.0 up to 4.1.8: fixed in 4.1.8
  • 3.0.0 up to 3.2.5: fixed in 3.2.5
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 44× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 193 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 93 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 16:35 UTCEchelonGraph re-scored
  2. 2026-11-12 16:35 UTCGHSA enrichmentGHSA-g8mr-85jm-7xhm · GitHub severity CRITICAL · GitHub CVSS 9.8
  3. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.9% · 60th percentile
  4. 2026-11-11 17:01 UTCEchelonGraph re-scored
  5. 2026-11-11 17:01 UTCGHSA enrichmentGHSA-g8mr-85jm-7xhm · GitHub severity CRITICAL · GitHub CVSS 9.8
  6. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  7. 2026-11-10 17:28 UTCEchelonGraph re-scored
  8. 2026-11-10 17:28 UTCGHSA enrichmentGHSA-g8mr-85jm-7xhm · GitHub severity CRITICAL · GitHub CVSS 9.8
  9. 2026-11-10 16:44 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  10. 2026-11-09 17:54 UTCEchelonGraph re-scored
  11. 2026-11-09 17:54 UTCGHSA enrichmentGHSA-g8mr-85jm-7xhm · GitHub severity CRITICAL · GitHub CVSS 9.8
  12. 2026-11-09 16:35 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  13. 2026-11-08 18:22 UTCEchelonGraph re-scored
  14. 2026-11-08 18:22 UTCGHSA enrichmentGHSA-g8mr-85jm-7xhm · GitHub severity CRITICAL · GitHub CVSS 9.8
  15. 2026-11-08 16:39 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  16. 2026-11-07 18:49 UTCEchelonGraph re-scored
  17. 2026-11-07 18:49 UTCGHSA enrichmentGHSA-g8mr-85jm-7xhm · GitHub severity CRITICAL · GitHub CVSS 9.8
  18. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  19. 2026-11-06 19:16 UTCEchelonGraph re-scored
  20. 2026-11-06 19:16 UTCGHSA enrichmentGHSA-g8mr-85jm-7xhm · GitHub severity CRITICAL · GitHub CVSS 9.8
  21. 2026-11-06 16:38 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  22. 2026-11-06 11:55 UTCOSV refresh
  23. 2026-11-05 19:40 UTCEchelonGraph re-scored
  24. 2026-11-05 19:40 UTCGHSA enrichmentGHSA-g8mr-85jm-7xhm · GitHub severity CRITICAL · GitHub CVSS 9.8
  25. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.9% · 59th percentile
Show 75 more
  1. 2026-11-04 20:07 UTCEchelonGraph re-scored
  2. 2026-11-04 20:07 UTCGHSA enrichmentGHSA-g8mr-85jm-7xhm · GitHub severity CRITICAL · GitHub CVSS 9.8
  3. 2026-11-04 16:35 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  4. 2026-11-03 20:33 UTCEchelonGraph re-scored
  5. 2026-11-03 20:33 UTCGHSA enrichmentGHSA-g8mr-85jm-7xhm · GitHub severity CRITICAL · GitHub CVSS 9.8
  6. 2026-11-03 16:48 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  7. 2026-11-02 21:00 UTCEchelonGraph re-scored
  8. 2026-11-02 21:00 UTCGHSA enrichmentGHSA-g8mr-85jm-7xhm · GitHub severity CRITICAL · GitHub CVSS 9.8
  9. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  10. 2026-11-01 21:27 UTCEchelonGraph re-scored
  11. 2026-11-01 21:27 UTCGHSA enrichmentGHSA-g8mr-85jm-7xhm · GitHub severity CRITICAL · GitHub CVSS 9.8
  12. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  13. 2026-11-01 07:45 UTCGHSA enrichmentGHSA-g8mr-85jm-7xhm · GitHub severity CRITICAL · GitHub CVSS 9.8
  14. 2026-11-01 07:45 UTCEchelonGraph re-scored
  15. 2026-10-31 21:55 UTCEchelonGraph re-scored
  16. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  17. 2026-10-30 22:22 UTCEchelonGraph re-scored
  18. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  19. 2026-10-29 22:50 UTCEchelonGraph re-scored
  20. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  21. 2026-10-28 23:18 UTCEchelonGraph re-scored
  22. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  23. 2026-10-27 23:42 UTCEchelonGraph re-scored
  24. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  25. 2026-10-27 00:07 UTCEchelonGraph re-scored
  26. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  27. 2026-10-25 20:58 UTCEchelonGraph re-scored
  28. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  29. 2026-10-25 14:20 UTCEchelonGraph re-scored
  30. 2026-10-24 21:26 UTCEchelonGraph re-scored
  31. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  32. 2026-10-24 13:12 UTCEchelonGraph re-scored
  33. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  34. 2026-10-23 13:32 UTCEchelonGraph re-scored
  35. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  36. 2026-10-22 13:59 UTCEchelonGraph re-scored
  37. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  38. 2026-10-21 14:26 UTCEchelonGraph re-scored
  39. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  40. 2026-10-20 14:34 UTCEchelonGraph re-scored
  41. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  42. 2026-10-19 13:39 UTCEchelonGraph re-scored
  43. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  44. 2026-10-18 03:31 UTCEchelonGraph re-scored
  45. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  46. 2026-10-17 14:00 UTCEchelonGraph re-scored
  47. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  48. 2026-10-16 14:26 UTCEchelonGraph re-scored
  49. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  50. 2026-10-15 14:46 UTCEchelonGraph re-scored
  51. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  52. 2026-10-14 09:18 UTCEchelonGraph re-scored
  53. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  54. 2026-10-13 06:37 UTCEchelonGraph re-scored
  55. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  56. 2026-10-12 15:57 UTCEchelonGraph re-scored
  57. 2026-10-11 19:40 UTCEchelonGraph re-scored
  58. 2026-10-11 16:55 UTCEchelonGraph re-scored
  59. 2026-10-11 14:18 UTCEchelonGraph re-scored
  60. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  61. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  62. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  63. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  64. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  65. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  66. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  67. 2026-10-03 16:48 UTCOSV refresh
  68. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  69. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  70. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  71. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  72. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  73. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  74. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  75. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.9% · 57th percentile

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Frequently asked(5)

What is CVE-2026-53633?
CVE-2026-53633 is a critical-severity vulnerability; its CVE record was published on June 15, 2026. Vitest is a testing framework powered by Vite. From 3.0.0 until 3.2.5, 4.1.8, and 5.0.0-beta.4, Vitest Browser Mode exposed a cdp() API that forwarded raw Chrome DevTools Protocol methods without being gated by allowWrite or allowExec, allowing a remote client with exposed browser API metadata to…
When was the CVE record for CVE-2026-53633 published?
The CVE record for CVE-2026-53633 was published on June 15, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 24, 2026; the record at its source may have been updated since.
Is CVE-2026-53633 actively exploited?
CVE-2026-53633 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.9% probability of exploitation in the next 30 days (60th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53633?
CVE-2026-53633 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-53633?
A fix for CVE-2026-53633 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-53633 are linked in the Vendor Advisories panel on this page.

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