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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
discourse discourse affected
Version Status Constraints
>= 2026.1.0-latest, < 2026.1.5 affected —
>= 2026.4.0-latest, < 2026.4.2 affected —
>= 2026.5.0-latest, < 2026.5.1 affected —

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Discourse Subscribe
Discourse Subscribe

Project Subscriptions

Vendors Products
Discourse Subscribe
Discourse Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/discourse/discourse/commit/3ee8343cd7f00d59d8513bee0a12e02d50bfc358 cve-icon
https://github.com/discourse/discourse/commit/810c2715799fd08b06fd6ffc664d9562fe9ea6ff cve-icon
https://github.com/discourse/discourse/commit/92a699d89b84685b6fdd63cd0d0e371793c69dad cve-icon
https://github.com/discourse/discourse/commit/b8ceb49f4ba52257be30eb3c2ce51a5bf03be5fe cve-icon
https://github.com/discourse/discourse/releases/tag/v2026.1.5 cve-icon
https://github.com/discourse/discourse/releases/tag/v2026.4.2 cve-icon
https://github.com/discourse/discourse/releases/tag/v2026.5.1 cve-icon
https://github.com/discourse/discourse/releases/tag/v2026.6.0 cve-icon
https://github.com/discourse/discourse/security/advisories/GHSA-jmcf-3367-78vv cve-icon
History

Fri, 10 Jul 2026 01:30:00 +0000

Type Values Removed Values Added
First Time appeared Discourse
Discourse discourse
Vendors & Products Discourse
Discourse discourse

Thu, 09 Jul 2026 22:15:00 +0000

Type Values Removed Values Added
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.
Title Discourse: Insufficient SVG sanitization logic
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-07-09T22:02:27.430Z

Reserved: 2026-06-11T15:50:01.282Z

Link: CVE-2026-53962

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-10T01:15:15Z

Weaknesses