# CVE-2026-67404

RabbitMQ OAuth2 accepts forged JWTs when CA bundle missing, allowing authentication bypass.

- Page: https://www.vulneraibility.com/cve/CVE-2026-67404
- CVSS: 9.2
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 0.20% (percentile 10.0)
- CISA SSVC: exploitation none, automatable no, technical impact total (assessed 2026-09-29)
- Weakness: CWE-295
- Also known as: GHSA-37wx-r6q9-6fhj
- Published: 2026-09-23

## Affected versions

- rabbitmq: affected >= 3.13.0 and < 3.13.15; >= 4.0.0 and < 4.0.20; >= 4.1.0 and < 4.1.11; >= 4.2.0 and < 4.2.6; fixed in 3.13.15, 4.0.20, 4.1.11, 4.2.6 (Bitnami advisory, via OSV)
- rabbitmq rabbitmq-server: affected >= 3.13.0 and < 3.13.15; >= 4.0.0 and < 4.0.20; >= 4.1.0 and < 4.1.11; >= 4.2.0 and < 4.2.6

A version outside these ranges is not a statement that it is unaffected.

## Impact

MITM attacker can forge JWKS responses causing broker to accept arbitrary JWTs, enabling auth bypass, unauthorized publish/consume, and privilege escalation.

## Action

Immediate action required

## Recommendation

Upgrade to fixed versions and ensure cacertfile/OS CA bundle is present

## References

- [other] https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-37wx-r6q9-6fhj
- [other] https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.