CVE-2026-74909

HIGHPre-NVD 8.18.1
EchelonGraph scoreMEDIUM confidence

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

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-09-16. A secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 4 sources updated this week

Also known asEUVD-2026-80829 (ENISA EUVD) · GHSA-5639-qg9x-rw29 (GitHub Security Advisories)Source: ENISA EUVD

8.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 8.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Keycloak provides a policy enforcer to protect applications by matching incoming web requests against defined security policies. A flaw was found where the enforcer fails to correctly normalize web addresses that contain special encoded characters, such as those representing semicolons or directory traversal segments. An authenticated user can use these encoded characters to trick the enforcer into applying a less restrictive security policy than intended, potentially gaining unauthorized access to sensitive administrative or private application endpoints.

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
37
EG Risk 37/100

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)
Severity81% × 45%
Impact severity (EG Severity): CVSS 8.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.9% × 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 low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (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.
EPSS PROB
0.8%
EPSS %ILE
58th
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 (8.1): severity, escalated by confirmed exploitation. This CVE's 8.1 is its impact severity (EG Severity), not escalated.

EG Severity
8.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.8% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-29). 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 or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 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 low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation none (CISA Vulnrichment) · Automatable no (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)14 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 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

September 16, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Sep 16, 2026
Patch available. Sources: redhat.
Red Hat

2517354 – (CVE-2026-74909) CVE-2026-74909 keycloak-services: keycloak-services: Incomplete fix for CVE-2026-15573 allows policy enforcer bypass via percent-encoded URI segments

https://bugzilla.redhat.com/show_bug.cgi?id=2517354
Red HatMentions a patch (unverified)

CVE-2026-74909 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-74909

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhbk/keycloak-rhel9-operator:26.6-202026-09-16redhat
redhatkeycloak-services2026-09-16redhat
redhatrhbk/keycloak-rhel9-operator:26.4-262026-09-16redhat

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 90× 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 it from the CNA feed. 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). Most recent first.

Showing the most recent 100 of 200 refreshes 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 100 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.8% · 58th percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.8% · 58th percentile
  3. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.8% · 58th percentile
  4. 2026-10-30 14:05 UTCEG score recompute
  5. 2026-10-30 14:05 UTCVendor advisory
  6. 2026-10-30 14:05 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  7. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  8. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  9. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  10. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  11. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  12. 2026-10-25 14:03 UTCEG score recompute
  13. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  14. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  15. 2026-10-23 16:23 UTCEG score recompute
  16. 2026-10-23 16:23 UTCVendor advisory
  17. 2026-10-23 16:23 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  18. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  19. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  20. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  21. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  22. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  23. 2026-10-18 03:13 UTCEG score recompute
  24. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  25. 2026-10-16 18:20 UTCEG score recompute
Show 75 more
  1. 2026-10-16 18:20 UTCVendor advisory
  2. 2026-10-16 18:19 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  3. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  4. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  5. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  6. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  7. 2026-10-13 07:24 UTCEG score recompute
  8. 2026-10-13 07:24 UTCVendor advisory
  9. 2026-10-13 07:24 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  10. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  11. 2026-10-12 15:39 UTCEG score recompute
  12. 2026-10-11 19:25 UTCEG score recompute
  13. 2026-10-11 18:55 UTCVendor advisory
  14. 2026-10-11 18:55 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  15. 2026-10-11 16:41 UTCEG score recompute
  16. 2026-10-11 14:00 UTCEG score recompute
  17. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  18. 2026-10-11 07:07 UTCEG score recompute
  19. 2026-10-11 07:07 UTCVendor advisory
  20. 2026-10-11 07:07 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  21. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  22. 2026-10-10 19:33 UTCVendor advisory
  23. 2026-10-10 19:33 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  24. 2026-10-10 07:37 UTCEG score recompute
  25. 2026-10-10 07:37 UTCVendor advisory
  26. 2026-10-10 07:37 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  27. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  28. 2026-10-09 19:42 UTCVendor advisory
  29. 2026-10-09 19:42 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  30. 2026-10-09 08:08 UTCVendor advisory
  31. 2026-10-09 08:08 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  32. 2026-10-08 20:33 UTCEG score recompute
  33. 2026-10-08 20:33 UTCVendor advisory
  34. 2026-10-08 20:33 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  35. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  36. 2026-10-08 07:45 UTCEG score recompute
  37. 2026-10-08 07:45 UTCVendor advisory
  38. 2026-10-08 07:45 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  39. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  40. 2026-10-07 20:11 UTCVendor advisory
  41. 2026-10-07 20:11 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  42. 2026-10-07 08:37 UTCVendor advisory
  43. 2026-10-07 08:37 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  44. 2026-10-06 21:03 UTCEG score recompute
  45. 2026-10-06 21:03 UTCVendor advisory
  46. 2026-10-06 21:02 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  47. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  48. 2026-10-06 09:21 UTCVendor advisory
  49. 2026-10-06 09:21 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  50. 2026-10-05 21:48 UTCEG score recompute
  51. 2026-10-05 21:48 UTCVendor advisory
  52. 2026-10-05 21:47 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  53. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  54. 2026-10-05 10:11 UTCVendor advisory
  55. 2026-10-05 10:10 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  56. 2026-10-04 22:37 UTCVendor advisory
  57. 2026-10-04 22:37 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  58. 2026-10-04 11:03 UTCVendor advisory
  59. 2026-10-04 11:03 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  60. 2026-10-03 23:30 UTCEG score recompute
  61. 2026-10-03 23:30 UTCVendor advisory
  62. 2026-10-03 23:30 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  63. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  64. 2026-10-03 11:54 UTCVendor advisory
  65. 2026-10-03 11:54 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  66. 2026-10-02 23:59 UTCEG score recompute
  67. 2026-10-02 23:59 UTCVendor advisory
  68. 2026-10-02 23:59 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  69. 2026-10-02 12:21 UTCVendor advisory
  70. 2026-10-02 12:20 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  71. 2026-10-02 00:11 UTCEG score recompute
  72. 2026-10-02 00:11 UTCVendor advisory
  73. 2026-10-02 00:11 UTCGHSA enrichmentGHSA-5639-qg9x-rw29 · GitHub severity HIGH · GitHub CVSS 8.1
  74. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  75. 2026-10-01 12:11 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-74909?
CVE-2026-74909 is a high-severity vulnerability; its CVE record was published on September 16, 2026. Keycloak provides a policy enforcer to protect applications by matching incoming web requests against defined security policies. A flaw was found where the enforcer fails to correctly normalize web addresses that contain special encoded characters, such as those representing semicolons or directory…
When was CVE-2026-74909 made public?
CVE-2026-74909 was made public on September 16, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on September 16, 2026. EchelonGraph's copy of the record carries a last-modified date of September 18, 2026; the record at its source may have been updated since.
Is CVE-2026-74909 actively exploited?
CVE-2026-74909 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (58th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-74909?
CVE-2026-74909 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-74909?
A fix for CVE-2026-74909 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-74909 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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