# CVE-2026-87755: Apache TomEE: Stateful session bean hijacking via predictable session identifiers

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

Stateful session bean identifiers are not generated from a cryptographically secure random source. A remote attacker with access to the EJB remote endpoint who holds one valid identifier can derive those of other clients' sessions and invoke methods on their beans, exposing or modifying other users' session state. 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-340

## Exploit evidence

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

## References

- https://lists.apache.org/thread.html/srzp26oyjtb3bwgxwsyhpphv778s17m8 (CNA: apache; vendor-advisory)

## Provenance

- CNA: apache: https://www.cve.org/CVERecord?id=CVE-2026-87755; retrieved 2026-11-10; source updated 2026-11-10

Revision: b1c0b986a3edfa142eb16e3af166de0b34bcbe552a1adf18fe3df77e94a55485

Canonical: https://y2.dev/cve/CVE-2026-87755

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