AUGUST 4, 2026
Live Feed
Back to database
Case File

CVE-2021-39161

MEDIUM · CVSS 4.4 EPSS 0.41% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-08-26 · Last synced 2026-08-04

CyberRota Analysis

This is a medium severity vulnerability with a CVSS score of 4.4. Public exploit code or proof-of-concept references have been detected in its references.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2021-39161
Severity
MEDIUM
CVSS
4.4
EPSS
0.41%

Original NVD Description

Discourse is an open source platform for community discussion. In affected versions category names can be used for Cross-site scripting(XSS) attacks. This is mitigated by Discourse's default Content Security Policy and this vulnerability only affects sites which have modified or disabled or changed Discourse's default Content Security Policy have allowed for moderators to modify categories. This issue is patched in the latest stable, beta and tests-passed versions of Discourse. Users are advised to ensure that the Content Security Policy is enabled, and has not been modified in a way which would make it more vulnerable to XSS attacks.

Related CVEs

Other vulnerabilities affecting the same vendor(s)