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-2026-67236

CVE-2026-67236HIGH

RabbitMQ: Plaintext username:password stored in an insecure cookie after successful POST /login

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   H   P   N   N   H   N   N    8.2   .0014    2.9     —

AFFECTED
  Product          Versions             Fixed
  rabbitmq-server  >= 4.2.0, < 4.2.8 –  —

TIMELINE
  Jul 28  Reserved by GitHub_M
  Sep 25  Published (CNA: GitHub_M)
  Oct 15  EXPLOIT PUBLISHED — CVE-2026-67236 (rabbitmq-server). Public exploit reference added.

CWE-312 · CNA: GitHub_M · CVSS v4.0 · 5 references · NVD status: Analyzed

Description

RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.2.8 and 4.3.2, a successful POST /login caused is_authorized/2 to set an auth cookie containing base64-encoded username:password credentials without HttpOnly, Secure, SameSite, or expiration protections. Because base64 is encoding rather than encryption, an attacker with same-origin cross-site scripting, an HTTP-readable network position, or local access to the browser cookie store could recover the actual login credentials; older browsers that treated an absent SameSite attribute as None also sent the cookie cross-site. This issue is fixed in versions 4.2.8 and 4.3.2.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 28, 2026	Reserved	Reserved by GitHub_M
September 25, 2026	Published	Published (CNA: GitHub_M)
October 15, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-67236 (rabbitmq-server). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
rabbitmq	rabbitmq-server	—	>= 4.2.0, < 4.2.8	—

Weaknesses

CWE-312

References (5)

https://github.com/rabbitmq/rabbitmq-server/commit/df9e7f4c0afd311a672705f020d301efad355745 [Patch]
https://github.com/rabbitmq/rabbitmq-server/commit/edf1fbc7217aaf736955d2e13c9534901a2e0778 [Patch]
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.8 [Release Notes]
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.2 [Release Notes]
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-88vh-gx85-p36m [Exploit, Third Party Advisory]

Authoritative record: CVE-2026-67236 at cve.org

Vendors: rabbitmq

Weaknesses: CWE-312

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-67236 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.