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CVE-2026-77816 IBM CVE debrief

IBM WebSphere Application Server - Liberty versions 17.0.0.3 through 26.0.0.9 administrative client are vulnerable to man-in-the-middle attacks due to improper certificate validation. An attacker could exploit this vulnerability to obtain sensitive information. Defenders should assess exposure and prioritize patching or compensating controls. This vulnerability affects IBM WebSphere Application Server - Liberty deployments, particularly those using versions 17.0.0.3 through 26.0.0.9. Exposure verification and patching are crucial.

Vendor
IBM
Product
WebSphere Application Server - Liberty
CVSS
MEDIUM 6.5
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 IBM WebSphere Application Server - Liberty deployments, particularly those using versions 17.0.0.3 through 26.0.0.9, should assess exposure and prioritize patching or compensating controls.

Why it matters

Defenders should care about CVE-2026-77816 because it affects IBM WebSphere Application Server - Liberty, potentially allowing man-in-the-middle attacks and sensitive information disclosure. Exposure verification and patching are crucial.

  • Potential exposure to man-in-the-middle attacks
  • Possible theft of sensitive information
  • Need to verify exposure of affected versions
  • Priority on applying patches or compensating controls

Technical summary

IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.9 administrative client could allow man-in-the-middle attacks due to improper certificate validation. This vulnerability affects the administrative client and could allow an attacker to intercept and modify communication between the client and server. Defenders should prioritize verifying exposure of affected versions and applying patches or compensating controls.

Defensive priority

Defenders should prioritize verifying exposure of IBM WebSphere Application Server - Liberty versions 17.0.0.3 through 26.0.0.9 and applying patches or compensating controls.

Recommended defensive actions

  • Verify exposure of IBM WebSphere Application Server - Liberty versions 17.0.0.3 through 26.0.0.9
  • Apply patches or compensating controls
  • Monitor for potential man-in-the-middle attacks

Evidence notes

The CVE record and source item provide details on the vulnerability in IBM WebSphere Application Server - Liberty. However, additional information on exploitation, impact, and remediation may be required for comprehensive risk assessment.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-77816 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-77816

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

  • CVE-2026-77816 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-77816

    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.