What’s Vulnerable › Vulnerabilities

CVE-2022-46162: Discourse BBCode plugin vulnerable to arbitrary CSS injection

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-11-30 · updated 2026-06-17
• Weakness: CWE-74

Description

discourse-bbcode is the official BBCode plugin for Discourse. Prior to commit 91478f5, CSS injection can occur when rendering content generated with the discourse-bccode plugin. This vulnerability only affects sites which have the discourse-bbcode plugin installed and enabled. This issue is patched in commit 91478f5. As a workaround, ensure that the Content Security Policy is enabled and monitor any posts that contain bbcode.

Affected products

• discourse-bbcode: before 2022-11-30 — fixed in 2022-11-30

How to fix

Upgrade to a fixed version: discourse-bbcode 2022-11-30. Check the vendor advisory for mitigations.

References

• https://github.com/discourse/discourse-bbcode/commit/91478f5cfecdcc43cf85b997168a8ecfd0f8df90
• https://github.com/discourse/discourse-bbcode/security/advisories/GHSA-8c87-xpqv-c7mp
• https://github.com/discourse/discourse-bbcode/commit/91478f5cfecdcc43cf85b997168a8ecfd0f8df90
• https://github.com/discourse/discourse-bbcode/security/advisories/GHSA-8c87-xpqv-c7mp

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