Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV N L P L N L L N 2.3 .0023 13.3 —
AFFECTED Product Versions Fixed rabbitmq-server >= 3.13.0, < 3.13.19 – —
TIMELINE Jul 29 Reserved by GitHub_M Sep 25 Published (CNA: GitHub_M) Oct 16 EXPLOIT PUBLISHED — CVE-2026-67420 (rabbitmq-server). Public exploit reference added.
RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.19, 4.0.24, 4.1.15, 4.2.10, and 4.3.5, RabbitMQ OAuth credential refresh retains revoked runtime tags. when an existing AMQP connection refreshes from an OAuth token that grants the impersonator tag to a valid same-username token that no longer grants that tag, RabbitMQ updates the OAuth backend implementation (token/scopes/expiry) but leaves the connection's runtime #user.tags unchanged. rabbitaccesscontrol:checkuserid/2 then still honors the stale impersonator tag, so the connection (including newly opened channels) can continue publishing messages with a foreign AMQP userid after that privilege should have been revoked. A fresh connection using the downgraded token correctly refuses the same publish, proving the defect is stale session state rather than the token Limited to connections that once held impersonator and successfully refresh to a downgraded same-username rabbitauthbackendoauth2 (or an equivalent refresh-capable backend that returns tags) is enabled for This issue is fixed in versions 3.13.19, 4.0.24, 4.1.15, 4.2.10, and 4.3.5.
| Date | Event | Detail |
|---|---|---|
| July 29, 2026 | Reserved | Reserved by GitHub_M |
| September 25, 2026 | Published | Published (CNA: GitHub_M) |
| October 16, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-67420 (rabbitmq-server). Public exploit reference added. |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| rabbitmq | rabbitmq-server | — | >= 3.13.0, < 3.13.19 | — |
Authoritative record: CVE-2026-67420 at cve.org
Vendors: rabbitmq
Weaknesses: CWE-862
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-67420 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 Monday, October 19, 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.
