CVE-2021-39161 is a Cross-site Scripting (XSS) vulnerability in Discourse, an open-source community discussion platform, where category names can be leveraged for XSS attacks. This medium-severity vulnerability (CVSS 5.4) primarily affects Discourse instances where the default Content Security Policy (CSP) has been modified, disabled, or altered to allow moderators to modify categories, increasing the attack complexity. While patched in recent Discourse versions, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 2.7.8CPE matchmatch criteria | cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:* | ||
2.8.0CPE matchmatch criteria | cpe:2.3:a:discourse:discourse:2.8.0:beta1:*:*:*:*:*:* | ||
2.8.0CPE matchmatch criteria | cpe:2.3:a:discourse:discourse:2.8.0:beta2:*:*:*:*:*:* | ||
2.8.0CPE matchmatch criteria | cpe:2.3:a:discourse:discourse:2.8.0:beta3:*:*:*:*:*:* | ||
2.8.0CPE matchmatch criteria | cpe:2.3:a:discourse:discourse:2.8.0:beta4:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.