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Description

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, a topic "featured link" was not sufficiently normalized and escaped before being rendered in the topic list, allowing a user who can set a featured link to inject JavaScript when default Content Security Policy protections were modified or disabled. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

PUBLISHED Reserved 2026-06-16 | Published 2026-07-09 | Updated 2026-07-10 | Assigner GitHub_M




HIGH: 7.4CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

>= 2026.1.0-latest, < 2026.1.5
affected

>= 2026.4.0-latest, < 2026.4.2
affected

>= 2026.5.0-latest, < 2026.5.1
affected

References

github.com/...course/security/advisories/GHSA-695w-7fv8-mxg3

github.com/...ommit/1bce8881e4253d9bbab56f011a12ef899b926b59

github.com/...ommit/6679d9a5083488bae10c2adbb345c481c583242c

github.com/...ommit/6828aee9b15c2655d63b515ac919830bd540ff83

github.com/...ommit/c9b9405f5bd0bf0269e505e28e3aad388d7657c5

github.com/discourse/discourse/releases/tag/v2026.1.5

github.com/discourse/discourse/releases/tag/v2026.4.2

github.com/discourse/discourse/releases/tag/v2026.5.1

github.com/discourse/discourse/releases/tag/v2026.6.0

cve.org (CVE-2026-55424)

nvd.nist.gov (CVE-2026-55424)

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