# CVE-2026-86532: Apache TomEE: Username enumeration and timing side channel in JAAS login modules

Status: published. Published: 2026-11-10. Updated: 2026-11-10.

The bundled JAAS login modules leak whether a username exists and compare credentials in a non-constant-time manner. A remote unauthenticated attacker can enumerate valid accounts and may infer credential material through timing analysis. Users are recommended to upgrade to version 10.3.0 or 11.0.0-M2, which fix the issue.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Apache Software Foundation / Apache TomEE (org.apache.openejb:openejb-core): ≥ 4.0.0-beta-1; ≤ 4.7.5 (affected, semver). Source: CNA: apache
- Apache Software Foundation / Apache TomEE (org.apache.tomee:openejb-core): ≥ 7.0.0-M1; < 10.0.0-M1 (affected, semver); ≥ 10.0.0-M1; < 10.3.0 (affected, semver); ≥ 11.0.0-M1; < 11.0.0-M2 (affected, semver). Source: CNA: apache

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-203

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://lists.apache.org/thread.html/oohwxbp6xx8dgl18xy1p1y6qjg59dgoh (CNA: apache; vendor-advisory)

## Provenance

- CNA: apache: https://www.cve.org/CVERecord?id=CVE-2026-86532; retrieved 2026-11-10; source updated 2026-11-10

Revision: 5c8b87dfc20f9fff3a4bd09d901912f43a965ea6950ff7c02d98535209798a48

Canonical: https://y2.dev/cve/CVE-2026-86532

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