CVE-2023-30538

MediumCVSS 5.4/10Last modified Jun 17, 2026

Description

Discourse is an open source platform for community discussion. Due to the improper sanitization of SVG files, an attacker can execute arbitrary JavaScript on the users’ browsers by uploading a crafted SVG file. This issue is patched in the latest stable and tests-passed versions of Discourse. Users are advised to upgrade. For users unable to upgrade there are two possible workarounds: enable CDN handing of uploads (and ensure the CDN sanitizes SVG files) or disable SVG file uploads by ensuring that the `authorized extensions` site setting does not include `svg` (or reset that setting to the default, by default Discourse doesn't enable SVG uploads by users).

Metrics

CVSS 3.1 5.4/10CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

VendorProductVersions
discoursediscoursestable: < 3.0.3; beta: < 3.1.0.beta4

References

Timeline

Published
Apr 18, 2023
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2023-30538: Medium severity, CVSS 5.4 | Vulnix