Unauthenticated access to new private chat messages in Discourse

published 2023-10-16 3 y ago modified 2026-09-08 2 mo ago also BIT-discourse-2023-45131 , EUVD-2023-49450 , GHSA-84gf-hhrc-9pw6

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 4.0%; EPSS 4.0% chance of exploitation in 30 days, percentile 90%
public exploits: 1; Exploit-DB

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.

Patch / fix

fixed in 1

discourse discourse 3.1.2, 3.2.0.beta2

Timeline

2023-10-16 Published
2025-07-22 First public exploit (EDB-52375)

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 2 y ago (2024-09-16)

Exploit prediction

4.04% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

EDB-52375 Discourse 3.1.1 - Unauthenticated Chat Message Access webapps, 2025-07-22

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
OSV	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
bitnami	discourse	<=3.1.1	no fix listed

Affected products

discourse discourse

Classification

Weakness

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

github.com /discourse/discourse/security/advisories/GHSA-84gf-hhrc-9pw6
vendor-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2023-45131
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary