Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-11538

CVE-2026-11538MEDIUM

IBM WebSphere Application Server prior to 9.0.5.29 and 8.5.5.31 are affected by multiple vulnerabilities

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  L  N    5.3   .0016    5.0     —

AFFECTED
  Product                       Versions  Fixed
  WebSphere Application Server  9.0 –     —

TIMELINE
  Jun 8   Reserved by ibm
  Sep 18  Published (CNA: ibm)
  Sep 24  RESCORED — CVE-2026-11538 (IBM WebSphere Application Server). CVSS 3.7 → 5.3 (NVD).

CWE-117 · CNA: ibm · CVSS v3.1 · 1 reference · NVD status: Analyzed

Description

IBM WebSphere Application Server 9.0 and 8.5 is affected by a log injection vulnerability through crafted LTPA token cookies.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 8, 2026	Reserved	Reserved by ibm
September 18, 2026	Published	Published (CNA: ibm)
September 24, 2026	RESCORED	RESCORED — CVE-2026-11538 (IBM WebSphere Application Server). CVSS 3.7 → 5.3 (NVD).

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
IBM	WebSphere Application Server	—	9.0	—

Weaknesses

CWE-117

References (1)

https://www.ibm.com/support/pages/node/7286610 [Patch, Vendor Advisory]

Authoritative record: CVE-2026-11538 at cve.org

Vendors: ibm

Weaknesses: CWE-117

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-11538 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.