Medium 5.4Published Jul 9, 2026

CVE-2026-53962Discourse: Insufficient SVG sanitization logic

Updated under an hour ago (Oct 28, 2026, 5:40 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 5.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

discourse discourse discourse:discourse (from the name)	from 2026.1.0-latest, < 2026.1.5; from 2026.4.0-latest, < 2026.4.2; from 2026.5.0-latest, < 2026.5.1	CNA record
discourse discourse discourse:discourse	from 2026.1.0 before 2026.1.5; from 2026.4.0 before 2026.4.2; from 2026.5.0 before 2026.5.1; 2026.6.0	NVD

References

References

https://github.com/discourse/discourse/security/advisories/GHSA-jmcf-3367-78vv	x-refsource-confirm, vendor-advisory
https://github.com/discourse/discourse/commit/3ee8343cd7f00d59d8513bee0a12e02d50bfc358	x-refsource-misc, patch
https://github.com/discourse/discourse/commit/810c2715799fd08b06fd6ffc664d9562fe9ea6ff	x-refsource-misc, patch
https://github.com/discourse/discourse/commit/92a699d89b84685b6fdd63cd0d0e371793c69dad	x-refsource-misc, patch
https://github.com/discourse/discourse/commit/b8ceb49f4ba52257be30eb3c2ce51a5bf03be5fe	x-refsource-misc, patch
https://github.com/discourse/discourse/releases/tag/v2026.1.5	x-refsource-misc, release-notes
https://github.com/discourse/discourse/releases/tag/v2026.4.2	x-refsource-misc, release-notes
https://github.com/discourse/discourse/releases/tag/v2026.5.1	x-refsource-misc, release-notes
https://github.com/discourse/discourse/releases/tag/v2026.6.0	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.