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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-67236
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 16:17:27 UTC
Updated2026-09-28 14:38:38 UTC
DescriptionRabbitMQ 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.

Risk And Classification

Primary CVSS: v4.0 8.2 HIGH from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.001200000 probability, percentile 0.016340000 (date 2026-09-29)

Problem Types: CWE-312 | CWE-312 CWE-312: Cleartext Storage of Sensitive Information

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8.2HIGHCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNADECLARED8.2HIGHCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
None
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Rabbitmq Rabbitmq-server affected >= 4.2.0, < 4.2.8 Not specified
CNA Rabbitmq Rabbitmq-server affected >= 4.3.0, < 4.3.2 Not specified

References

ReferenceSourceLinkTags
github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.2 [email protected] github.com
github.com/rabbitmq/rabbitmq-server/commit/df9e7f4c0afd311a672705f020d30... [email protected] github.com
github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.8 [email protected] github.com
github.com/rabbitmq/rabbitmq-server/commit/edf1fbc7217aaf736955d2e13c953... [email protected] github.com
github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-88vh-gx85-p36m [email protected] github.com
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