CVE-2023-45131: Unauthenticated access to new private chat messages in Discourse

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-10-16 · updated 2026-06-17
Weakness: CWE-200

Description

Discourse is an open source platform for community discussion. New chat messages can be read by making an unauthenticated POST request to MessageBus. This issue is patched in the 3.1.1 stable and 3.2.0.beta2 versions of Discourse. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

discourse: through 3.1.1; 3.2.0-beta1

References

https://github.com/discourse/discourse/security/advisories/GHSA-84gf-hhrc-9pw6
https://github.com/discourse/discourse/security/advisories/GHSA-84gf-hhrc-9pw6

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