CVE-2026-15554

HIGHPre-NVD 7.47.4—
EchelonGraph scoreMEDIUM confidence

Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2026-08-11. A secondary CVSS source baseline 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

the Undertow AJP listener honours forged ssl_cert and is_ssl AJP attributes without requiring any shared-secret authentication. This enables an unauthenticated attacker with direct TCP access to port 8009 to bypass CLIENT-CERT authentication by injecting a forged X.509 certificate via the AJP protocol.

CVSS v3
7.4
EG Score
7.4HIGHmedium confidence
EG Risk
33
EG Risk 33/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity74% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
26th
KEV
Not listed

CISA SSVCTrack 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). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 11, 2026

Last Modified

September 25, 2026

Advisory Details (2)

Auto-updated Aug 11, 2026
Patch available. Sources: redhat.
redhat

2480601 – (CVE-2026-15554) CVE-2026-15554 undertow-core: Undertow: Authentication Bypass via AJP ssl_cert/is_ssl Forgery

https://bugzilla.redhat.com/show_bug.cgi?id=2480601
redhat Patch Available

CVE-2026-15554 - 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-2026-15554

Vendor Advisories for CVE-2026-15554(8)

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

Patch Availability(7)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhateap8-xml-security-0:3.0.6-1.redhat_00001.1.el10eap2026-09-22redhat
redhateap8-xml-security-0:3.0.6-1.redhat_00001.1.el8eap2026-09-22redhat
redhateap8-xml-security-0:3.0.6-1.redhat_00001.1.el9eap2026-09-22redhat
redhatio.undertow/undertow-core:2.2.40.SP3-redhat-000012026-08-11redhat
redhateap7-wildfly-0:7.4.25-2.GA_redhat_00001.1.el7eap2026-08-11redhat
redhateap7-wildfly-0:7.4.25-2.GA_redhat_00001.1.el8eap2026-08-11redhat
redhateap7-wildfly-0:7.4.25-2.GA_redhat_00001.1.el9eap2026-08-11redhat

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)
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
undertow1.3.11-1 ... 2.3.8-2 (56 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 27× in last 7d / 152× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 305 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-15554?
CVE-2026-15554 is a high vulnerability published on August 11, 2026. the Undertow AJP listener honours forged sslcert and isssl AJP attributes without requiring any shared-secret authentication. This enables an unauthenticated attacker with direct TCP access to port 8009 to bypass CLIENT-CERT authentication by injecting a forged X.509 certificate via the AJP…
When was CVE-2026-15554 disclosed?
CVE-2026-15554 was first published on August 11, 2026, with the most recent update on September 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15554 actively exploited?
CVE-2026-15554 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (26th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-15554?
CVE-2026-15554 has a CVSS base score of 7.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-15554?
A fix for CVE-2026-15554 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-15554 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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