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CVE-2026-93909 IBM CVE debrief

IBM WebSphere Application Server Liberty is vulnerable to a critical authentication bypass when the samlWeb-2.0 feature is enabled. Affected versions range from 17.0.0.3 through 26.0.0.10. This vulnerability can allow an attacker to bypass authentication mechanisms, potentially leading to unauthorized access. Defenders should prioritize verifying exposure, applying patches, and monitoring for suspicious activity to mitigate potential risks. The CVE record and source item provide details on the vulnerability, affected versions, and a reference to the vendor advisory. It is essential to review the current version and exposure to determine if patching is required.

Vendor
IBM
Product
WebSphere Application Server - Liberty
CVSS
CRITICAL 9.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-14
Advisory published
2026-10-13
Advisory updated
2026-10-14

Who should care

Defenders responsible for WebSphere Application Server - Liberty deployments, particularly those using the samlWeb-2.0 feature, should assess exposure and apply necessary patches or mitigations.

Why it matters

CVE-2026-93909 is a critical authentication bypass vulnerability in IBM WebSphere Application Server Liberty. Defenders should prioritize verifying exposure, applying patches, and monitoring for suspicious activity to mitigate potential risks.

  • Potential unauthorized access to sensitive data or systems.
  • Bypass of authentication mechanisms, allowing attackers to perform actions as if they were authenticated.
  • Possible lateral movement within the network if the vulnerability is exploited.
  • Need for verification of current version and exposure to determine if patching is required.

Technical summary

The vulnerability exists in IBM WebSphere Application Server - Liberty versions 17.0.0.3 through 26.0.0.10 when the samlWeb-2.0 feature is enabled. An authentication bypass vulnerability can allow an attacker to bypass authentication mechanisms, potentially leading to unauthorized access.

Defensive priority

Defenders should prioritize verifying exposure and applying patches, as authentication bypass can lead to significant security risks.

Recommended defensive actions

  • Verify if the samlWeb-2.0 feature is enabled and if the server is exposed to the vulnerability.
  • Check if the current version of WebSphere Application Server - Liberty is within the affected range (17.0.0.3 through 26.0.0.10).
  • Apply patches or updates as recommended by the vendor.
  • Monitor for any suspicious activity or unauthorized access attempts.

Evidence notes

The CVE record and source item provide details on the vulnerability, affected versions, and a reference to the vendor advisory. The vulnerability exists in IBM WebSphere Application Server - Liberty versions 17.0.0.3 through 26.0.0.10 when the samlWeb-2.0 feature is enabled. An authentication bypass vulnerability can allow an attacker to bypass authentication mechanisms, potentially leading to unauthorized access. Defenders should verify if the samlWeb-2.0 feature is enabled and if the

Sources and references

Verified primary and authoritative sources

  • CVE-2026-93909 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-93909

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-93909 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-93909

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.