Medium severity · published Mar 31, 2026
CVE-2026-32243
Discourse: Stored XSS in discourse-ai shared conversations onebox
5.4
CVSS
0.2%
EPSS
No
On KEV
Description
Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, an attacker with the ability to create shared AI conversations could inject arbitrary HTML and JavaScript via crafted conversation titles. This payload would execute in the browser of any user viewing the onebox preview, potentially allowing session hijacking or unauthorized actions on behalf of the victim. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DI
discourse · discourse
>= 2026.1.0-latest, < 2026.1.3; >= 2026.2.0-latest, < 2026.2.2; >= 2026.3.0-latest, < 2026.3.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-32243
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-32243
Patch
https://github.com/discourse/discourse/commit/cac7d618a562ce934f8dbf73cdb70066a4806b4c
Vendor Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-pjc5-8x3w-rfwx
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