PT-2026-96282 · Discourse · Discourse
CVE-2026-59830
·
Published
2026-09-21
·
Updated
2026-09-29
CVSS v3.1
5.4
Medium
| Vector | AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
Name of the Vulnerable Software and Affected Versions
Discourse versions prior to 2026.7.0
Description
The post action component fails to escape user-controlled display names before they are interpolated into an HTML string passed to the
trustHTML function. An attacker can set a crafted display name to persist markup in post action descriptions, allowing the execution of arbitrary scripts in the browser of another user who views the affected user activity streams.Recommendations
Update to version 2026.7.0.
Exploit
Fix
XSS
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Weakness Enumeration
Related Identifiers
Affected Products
Discourse