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.

CVE-2026-66078

CVE-2026-66078LOW

RabbitMQ: protected tag bypass via bulk-delete

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   P   H   N   N   L   N    2.1   .0038   30.1     —

AFFECTED
  Product          Versions                Fixed
  rabbitmq-server  >= 3.13.0, < 3.13.15 –  —

TIMELINE
  Jul 23  Reserved by GitHub_M
  Sep 25  Published (CNA: GitHub_M)
  Oct 15  EXPLOIT PUBLISHED — CVE-2026-66078 (rabbitmq-server). Public exploit reference added.

CWE-862 · CNA: GitHub_M · CVSS v4.0 · 3 references · NVD status: Analyzed

Description

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15 and 4.0.20 and 4.1.11 and 4.2.6, protected tag bypass via bulk-delete. dELETE /api/users/:name refuses to delete users tagged protected (rabbitmgmtwmuser:deleteresource/2 checks isprotecteduser). POST /api/users/bulk-delete iterates the supplied username list and calls rabbitauthbackendinternal:deleteuser/2 directly , that function has no protected-tag check , so the guard is silently An administrator can delete protected-tagged service accounts via the bulk endpoint, bypassing a safeguard the test suite confirms is rabbitmqmanagement enabled Attacker has the administrator tag A protected-tagged user. This issue is fixed in versions 3.13.15 and 4.0.20 and 4.1.11 and 4.2.6.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 23, 2026	Reserved	Reserved by GitHub_M
September 25, 2026	Published	Published (CNA: GitHub_M)
October 15, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-66078 (rabbitmq-server). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
rabbitmq	rabbitmq-server	—	>= 3.13.0, < 3.13.15	—

Weaknesses

CWE-862

References (3)

https://github.com/rabbitmq/rabbitmq-server/commit/e5b890a64b42ec1f79a8e9d735512150cf77479c [Patch]
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6 [Release Notes]
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-j9m2-hw6x-rqr9 [Exploit, Third Party Advisory]

Authoritative record: CVE-2026-66078 at cve.org

Vendors: rabbitmq

Weaknesses: CWE-862

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-66078 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.