Discourse-Chat Cross-Site Scripting issue for channel names and descriptions

published 2022-09-06 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-38824

cvss: 5.4; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits: 0; none known

Discourse-Chat is an asynchronous messaging plugin for the Discourse open-source discussion platform. Users of Discourse Chat can be affected by admin users inserting HTML into chat titles and descriptions, causing a Cross-Site Scripting (XSS) attack. Version 0.9 contains a patch for this issue.

Patch / fix

fixed in 1 links 1

discourse discourse-chat 0.9

github.com/discourse/discourse-chat#1205 pull request

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 18 mo ago (2025-04-23)

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD	3.1	4.8	CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Affected products

discourse discourse-chat

Classification

Weakness

CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page
CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /discourse/discourse-chat/pull/1205
patch, third-party-advisory
github.com /discourse/discourse-chat/security/advisories/GHSA-3vf2-wrjx-p6xj
third-party-advisory

Sources

CVE List CVE-2022-36057
NVD CVE-2022-36057

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