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Medium severity4.4NVD Advisory· Published May 27, 2026· Updated May 27, 2026

CVE-2026-5516

CVE-2026-5516

Description

IBM WebSphere Application Server - Liberty 22.0.0.11 through 26.0.0.5 IBM WebSphere Application Server Liberty could allow a remote attacker to bypass security under limited conditions by exploiting a specific timing window.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

IBM WebSphere Application Server Liberty 22.0.0.11 through 26.0.0.5 with appSecurity features allows remote attackers to bypass security via a timing window.

Vulnerability

IBM WebSphere Application Server Liberty versions 22.0.0.11 through 26.0.0.5, with the appSecurity-3.0, appSecurity-4.0, or appSecurity-5.0 feature enabled, is vulnerable to a security bypass. The bug exists due to a specific timing window that can be exploited under limited conditions [1].

Exploitation

An attacker requires network access and high privileges (CVSS PR:H) to exploit this vulnerability. The exploitation involves sending specially crafted requests to the server during a precise timing window, bypassing security checks [1].

Impact

Successful exploitation could lead to disclosure of confidential information (confidentiality impact high), with no integrity or availability impact [1].

Mitigation

IBM has released an interim fix for APAR PH70798, and the fix is included in Liberty Fix Pack 26.0.0.6 (targeted 3Q2026). Users should upgrade to the minimal required fix pack levels and apply the interim fix, or upgrade to 26.0.0.6 or later [1]. No workarounds are available.

References
  1. Security Bulletin: IBM WebSphere Application Server Liberty is affected by a security bypass vulnerability (CVE-2026-5516)

AI Insight generated on May 27, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.

Affected products

1

Patches

0

No patches discovered yet.

Vulnerability mechanics

No source-code context for this CVE — mechanics is only generated when we can read the actual fix diff. Without that, the four sections (root cause, attack vector, affected code, fix) would be speculation rather than analysis.

References

1

News mentions

0

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