CVE-2026-54573

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (43rd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source

Also known asEUVD-2026-39466 (ENISA EUVD)Source: ENISA EUVD

5.3EG
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: 0.5%CVSS: 5.3Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

Outline is a service that allows for collaborative documentation. Prior to 1.8.0, the AuthenticationHelper.canAccess function uses ctx.originalUrl to verify if an API key or OAuth token has the required scopes for a request. It extracts the resource by splitting the URL by / and taking the last segment. However, it fails to strip the URL fragment (#). Because Koa's router uses ctx.path (which strips the fragment) for routing, an attacker can append a fragment containing a permitted path (e.g., #foo/api/documents.info) to a restricted endpoint (e.g., /api/documents.create). The router will route the request to the restricted endpoint, but canAccess will evaluate the permitted path in the fragment, bypassing the API key scope restrictions and allowing privilege escalation. This vulnerability is fixed in 1.8.0.

CVSS
5.3
EG Score
5.3MEDIUMmedium 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)
Severity53% × 45%
Impact severity (EG Severity): CVSS 5.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 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: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
43rd
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 (5.3): severity, escalated by confirmed exploitation. This CVE's 5.3 is its impact severity (EG Severity), not escalated.

EG Severity
5.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). 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.

The CVE record names the fixed release. 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

June 25, 2026

Last Modified

June 26, 2026

Advisory Details (1)

Auto-updated Jun 25, 2026
Fix named in the CVE record. Sources: github.
GitHub advisoryMentions a patch (unverified)

Authorization Bypass in API Key/OAuth Scopes via Path Parsing Discrepancy · Advisory · outline/outline · GitHub

https://github.com/outline/outline/security/advisories/GHSA-5x79-rj4g-qrh8

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 → 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 180 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 80 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:53 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  2. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  3. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  4. 2026-11-10 16:44 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  5. 2026-11-09 16:35 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  6. 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  7. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  8. 2026-11-06 16:38 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  9. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  10. 2026-11-04 16:35 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  11. 2026-11-03 16:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  12. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  13. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  14. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  15. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  16. 2026-10-30 11:25 UTCOSV refresh
  17. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  18. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  19. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  20. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  21. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  22. 2026-10-25 14:19 UTCEchelonGraph re-scored
  23. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  24. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  25. 2026-10-22 21:20 UTCEchelonGraph re-scored
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  1. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  2. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  3. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  4. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  5. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  6. 2026-10-18 03:30 UTCEchelonGraph re-scored
  7. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  8. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  9. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  10. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  11. 2026-10-13 22:54 UTCOSV refresh
  12. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  13. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  14. 2026-10-12 15:56 UTCEchelonGraph re-scored
  15. 2026-10-11 19:39 UTCEchelonGraph re-scored
  16. 2026-10-11 16:54 UTCEchelonGraph re-scored
  17. 2026-10-11 14:17 UTCEchelonGraph re-scored
  18. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  19. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  20. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  21. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  22. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  23. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  24. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  25. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  26. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  27. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  28. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  29. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  30. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  31. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  32. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  33. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  34. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  35. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  36. 2026-09-23 08:45 UTCEchelonGraph re-scored
  37. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  38. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  39. 2026-09-18 07:22 UTCEchelonGraph re-scored
  40. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  41. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  42. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  43. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  44. 2026-09-14 01:18 UTCEchelonGraph re-scored
  45. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  46. 2026-09-12 15:47 UTCEchelonGraph re-scored
  47. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  48. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  49. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  50. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  51. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  52. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  53. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  54. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  55. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  56. 2026-08-30 19:33 UTCEchelonGraph re-scored
  57. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  58. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  59. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  60. 2026-08-27 23:21 UTCEchelonGraph re-scored
  61. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  62. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  63. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  64. 2026-08-24 13:10 UTCEchelonGraph re-scored
  65. 2026-08-23 11:48 UTCEchelonGraph re-scored
  66. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  67. 2026-08-22 10:27 UTCEchelonGraph re-scored
  68. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  69. 2026-08-21 08:25 UTCEchelonGraph re-scored
  70. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  71. 2026-08-20 07:03 UTCEchelonGraph re-scored
  72. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  73. 2026-08-19 01:23 UTCEchelonGraph re-scored
  74. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  75. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-54573?
CVE-2026-54573 is a medium-severity vulnerability; its CVE record was published on June 25, 2026. Outline is a service that allows for collaborative documentation. Prior to 1.8.0, the AuthenticationHelper.canAccess function uses ctx.originalUrl to verify if an API key or OAuth token has the required scopes for a request. It extracts the resource by splitting the URL by / and taking the last…
When was the CVE record for CVE-2026-54573 published?
The CVE record for CVE-2026-54573 was published on June 25, 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 June 26, 2026; the record at its source may have been updated since.
Is CVE-2026-54573 actively exploited?
CVE-2026-54573 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54573?
CVE-2026-54573 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54573?
The CVE record for CVE-2026-54573 names the fix: "This vulnerability is fixed in 1.8.0."

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