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TI-2026-73527 Aliases CVE-2026-93909GHSA-vcr6-887c-vp66

Authentication bypass in IBM WebSphere Application Server Liberty

Priority MEDIUM 47CWE-384Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
High · High · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-384.

Summary

IBM WebSphere Application Server - Liberty from 17.0.0.3 through 26.0.0.10 contains an authentication bypass when the samlWeb-2.0 feature is enabled. The flaw is classified as session fixation (CWE-384). A remote, unauthenticated attacker with low attack complexity and no user interaction can bypass authentication and affect confidentiality and integrity.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.10 is vulnerable by an authentication bypass vulnerability when samlWeb-2.0 feature is enabled.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00337 27th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
IBMWebSphere Application Server - Liberty17.0.0.3 – 26.0.0.10—No fix listedCNA
  • WebSphere Application Server - Liberty VendorIBM Affected 17.0.0.3 – 26.0.0.10 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:ibm:websphere_application_server:*:*:*:*:liberty:*:*:*17.0.0.3 to before 26.0.0.11VulnerableIBM
  • cpe:2.3:a:ibm:websphere_application_server:*:*:*:*:liberty:*:*:* Versions 17.0.0.3 to before 26.0.0.11 Vulnerable ·IBM

Remediation

The sources list no fixed version for IBM WebSphere Application Server - Liberty.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-93909
  2. 2026-10-13 Alias added: GHSA-vcr6-887c-vp66
  3. 2026-10-14 CISA SSVC decision points changed

References

Patch 1

  • TI-2015-06198 Serialized-object interfaces in certain IBM analytics, business solutions, cognitive, IT… KEVCVSS 3.1CRITICAL 9.8
  • TI-2010-00403 modules/arch/win32/mod_isapi.c in mod_isapi in the Apache HTTP Server 2.0.37 through… CVSS 2.0HIGH 10.0
  • TI-2019-03185 Deserialization of untrusted data in IBM WebSphere Application Server CVSS 3.1CRITICAL 9.8
  • TI-2020-03809 Deserialization of untrusted data in IBM WebSphere Application Server CVSS 3.1CRITICAL 9.8
  • TI-2025-24648 IBM WebSphere Application Server code execution CVSS 3.1CRITICAL 9.8
  • TI-2020-03807 Deserialization of untrusted data in IBM WebSphere Application Server CVSS 3.1CRITICAL 9.8
See all 502 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences