Unrated severityNVD Advisory· Published Jul 9, 2026· Updated Jul 10, 2026
Discourse: Insufficient SVG sanitization logic
CVE-2026-53962
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.
Affected products
2- Range: <2026.6.0, <2026.5.1, <2026.4.2, <2026.1.5
Patches
Vulnerability mechanics
References
9- github.com/discourse/discourse/commit/3ee8343cd7f00d59d8513bee0a12e02d50bfc358mitrex_refsource_MISC
- github.com/discourse/discourse/commit/810c2715799fd08b06fd6ffc664d9562fe9ea6ffmitrex_refsource_MISC
- github.com/discourse/discourse/commit/92a699d89b84685b6fdd63cd0d0e371793c69dadmitrex_refsource_MISC
- github.com/discourse/discourse/commit/b8ceb49f4ba52257be30eb3c2ce51a5bf03be5femitrex_refsource_MISC
- github.com/discourse/discourse/releases/tag/v2026.1.5mitrex_refsource_MISC
- github.com/discourse/discourse/releases/tag/v2026.4.2mitrex_refsource_MISC
- github.com/discourse/discourse/releases/tag/v2026.5.1mitrex_refsource_MISC
- github.com/discourse/discourse/releases/tag/v2026.6.0mitrex_refsource_MISC
- github.com/discourse/discourse/security/advisories/GHSA-jmcf-3367-78vvmitrex_refsource_CONFIRM
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