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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, insufficient SVG sanitization in upload and user avatar handling could lead to cross-site scripting when a user visited specific URLs that are not normally part of community browsing. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

PUBLISHED Reserved 2026-06-11 | Published 2026-07-09 | Updated 2026-07-10 | Assigner GitHub_M




MEDIUM: 5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A: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-jmcf-3367-78vv

github.com/...ommit/3ee8343cd7f00d59d8513bee0a12e02d50bfc358

github.com/...ommit/810c2715799fd08b06fd6ffc664d9562fe9ea6ff

github.com/...ommit/92a699d89b84685b6fdd63cd0d0e371793c69dad

github.com/...ommit/b8ceb49f4ba52257be30eb3c2ce51a5bf03be5fe

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-2026-53962)

nvd.nist.gov (CVE-2026-53962)

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