CVE-2026-75834

MEDIUMPre-NVD 5.45.4
EchelonGraph scoreMEDIUM confidence

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

Score 5.4 from GitHub Security Advisory (severity: MODERATE) published 2026-09-17. A secondary CVSS source baseline 5.4; sources differ by 0.0.

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

Also known asEUVD-2026-60598 (ENISA EUVD) · GHSA-993v-76jg-67xr (GitHub Security Advisories) · GHSA-q2j8-x8hf-63ch (GitHub Security Advisories)Source: ENISA EUVD

5.4EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Grav before 2.0.14 contains a stored cross-site scripting vulnerability in the Security::detectXss() function (system/src/Grav/Common/Security.php). All XSS detection patterns use the PCRE /u (UTF-8) modifier, so a single invalid UTF-8 byte anywhere in page content causes preg_match() to return false for every pattern, silently bypassing the save-time XSS safety gate (Validation::checkSafety()). An authenticated attacker with page-edit permissions (without the security.xss_whitelist privilege) can store malicious JavaScript that executes in the browser of a visitor who views the affected page.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

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)
Severity54% × 45%
Impact severity (EG Severity): CVSS 5.4 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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.
EPSS PROB
0.3%
EPSS %ILE
17th
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 (5.4): severity, escalated by confirmed exploitation. This CVE's 5.4 is its impact severity (EG Severity), not escalated.

EG Severity
5.4 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). 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 every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade 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 every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (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

August 18, 2026

Last Modified

October 22, 2026

Advisory Details (2)

Auto-updated Aug 18, 2026
Patch available. Sources: github.
Web page

Grav before 2.0.14 Stored XSS via Invalid UTF-8 Byte | Advisories | VulnCheck

https://www.vulncheck.com/advisories/grav-before-stored-xss-via-invalid-utf-8-byte
GitHub advisoryMentions a patch (unverified)

Single invalid UTF-8 byte disables every rule in Security::detectXss(), bypassing the page-content XSS safety gate · Advisory · getgrav/grav · GitHub

https://github.com/getgrav/grav/security/advisories/GHSA-q2j8-x8hf-63ch

Vendor Advisories for CVE-2026-75834(1)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
composergetgrav/grav @ 2.0.14 (fixes < 2.0.14)—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

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
getgrav/grav0.8.0 ... 2.0.9 (348 versions)
  • every version up to 2.0.14: fixed in 2.0.14
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 31× 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 167 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 67 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  2. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  3. 2026-11-10 16:45 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  4. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  5. 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  6. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  7. 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  8. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  9. 2026-11-04 16:36 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  10. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  11. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  12. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  13. 2026-11-01 07:39 UTCEchelonGraph re-scored
  14. 2026-11-01 07:39 UTCGHSA enrichmentGHSA-q2j8-x8hf-63ch · GitHub severity MODERATE · GitHub CVSS 5.4
  15. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  16. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  17. 2026-10-29 17:02 UTCEchelonGraph re-scored
  18. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  19. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  20. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  21. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  22. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  23. 2026-10-25 14:02 UTCEchelonGraph re-scored
  24. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  25. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.3% · 16th percentile
Show 75 more
  1. 2026-10-22 18:55 UTCEchelonGraph re-scored
  2. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  3. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  4. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  5. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  6. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  7. 2026-10-18 03:13 UTCEchelonGraph re-scored
  8. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  9. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  10. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  11. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  12. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  13. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  14. 2026-10-12 15:39 UTCEchelonGraph re-scored
  15. 2026-10-11 19:24 UTCEchelonGraph re-scored
  16. 2026-10-11 16:40 UTCEchelonGraph re-scored
  17. 2026-10-11 13:59 UTCEchelonGraph re-scored
  18. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  19. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  20. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  21. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  22. 2026-10-08 16:36 UTCEchelonGraph re-scored
  23. 2026-10-08 15:42 UTCEchelonGraph re-scored
  24. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  25. 2026-10-07 11:17 UTCEchelonGraph re-scored
  26. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  27. 2026-10-06 08:51 UTCEchelonGraph re-scored
  28. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  29. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  30. 2026-10-03 17:44 UTCEchelonGraph re-scored
  31. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  32. 2026-10-02 15:43 UTCEchelonGraph re-scored
  33. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  34. 2026-10-01 10:26 UTCEchelonGraph re-scored
  35. 2026-09-30 09:55 UTCEchelonGraph re-scored
  36. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  37. 2026-09-28 08:34 UTCEchelonGraph re-scored
  38. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  39. 2026-09-27 08:03 UTCEchelonGraph re-scored
  40. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  41. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  42. 2026-09-25 12:25 UTCEchelonGraph re-scored
  43. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  44. 2026-09-24 11:47 UTCEchelonGraph re-scored
  45. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  46. 2026-09-23 11:16 UTCEchelonGraph re-scored
  47. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  48. 2026-09-22 10:45 UTCEchelonGraph re-scored
  49. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  50. 2026-09-21 10:14 UTCEchelonGraph re-scored
  51. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  52. 2026-09-20 09:43 UTCEchelonGraph re-scored
  53. 2026-09-19 06:30 UTCEchelonGraph re-scored
  54. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  55. 2026-09-18 05:57 UTCEchelonGraph re-scored
  56. 2026-09-17 05:24 UTCEchelonGraph re-scored
  57. 2026-09-17 05:24 UTCGHSA enrichmentGHSA-993v-76jg-67xr · GitHub CVSS 5.4
  58. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  59. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  60. 2026-09-16 04:53 UTCGHSA enrichmentGHSA-993v-76jg-67xr · GitHub CVSS 5.4
  61. 2026-09-15 03:48 UTCEchelonGraph re-scored
  62. 2026-09-15 03:48 UTCGHSA enrichmentGHSA-993v-76jg-67xr · GitHub CVSS 5.4
  63. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  64. 2026-09-14 03:17 UTCEchelonGraph re-scored
  65. 2026-09-14 03:17 UTCGHSA enrichmentGHSA-993v-76jg-67xr · GitHub CVSS 5.4
  66. 2026-09-13 02:47 UTCEchelonGraph re-scored
  67. 2026-09-13 02:47 UTCGHSA enrichmentGHSA-993v-76jg-67xr · GitHub CVSS 5.4
  68. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  69. 2026-09-12 02:15 UTCEchelonGraph re-scored
  70. 2026-09-12 02:15 UTCGHSA enrichmentGHSA-993v-76jg-67xr · GitHub CVSS 5.4
  71. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  72. 2026-09-11 01:42 UTCEchelonGraph re-scored
  73. 2026-09-11 01:42 UTCGHSA enrichmentGHSA-993v-76jg-67xr · GitHub CVSS 5.4
  74. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  75. 2026-09-10 01:11 UTCEchelonGraph re-scored

Frequently asked(5)

What is CVE-2026-75834?
CVE-2026-75834 is a medium-severity vulnerability; its CVE record was published on August 18, 2026. Grav before 2.0.14 contains a stored cross-site scripting vulnerability in the Security::detectXss() function (system/src/Grav/Common/Security.php). All XSS detection patterns use the PCRE /u (UTF-8) modifier, so a single invalid UTF-8 byte anywhere in page content causes preg_match() to return…
When was CVE-2026-75834 made public?
CVE-2026-75834 was made public on August 3, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on August 18, 2026. EchelonGraph's copy of the record carries a last-modified date of October 22, 2026; the record at its source may have been updated since.
Is CVE-2026-75834 actively exploited?
CVE-2026-75834 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (17th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-75834?
CVE-2026-75834 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-75834?
A fix for CVE-2026-75834 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-75834 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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