CVE-2026-67236RabbitMQ: Plaintext username:password stored in an insecure cookie after successful POST /login
Updated under an hour ago ()
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It affects rabbitmq-server and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
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.
- CVSS
- 8.2 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- Weakness (CWE)
- CWE-312
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Sep 28, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
rabbitmq rabbitmq-server rabbitmq:server (from the name) | from 4.2.0, < 4.2.8; from 4.3.0, < 4.3.2 | CNA record |
broadcom rabbitmq_server broadcom:rabbitmq_server | from 4.2.0 before 4.2.8; from 4.3.0 before 4.3.2 | NVD |
References
- https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-88vh-gx85-p36mx-refsource-confirm, exploit, third-party-advisory
- https://github.com/rabbitmq/rabbitmq-server/commit/df9e7f4c0afd311a672705f020d301efad355745x-refsource-misc, patch
- https://github.com/rabbitmq/rabbitmq-server/commit/edf1fbc7217aaf736955d2e13c9534901a2e0778x-refsource-misc, patch
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.8x-refsource-misc, release-notes
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.2x-refsource-misc, release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.