CVE-2023-30538: Stored Cross-site Scripting via improper sanitization of svg files in Discourse
First published: Tue Apr 18 2023(Updated: )
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).
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Discourse Discourse | <=3.0.2 | |
| Discourse Discourse | <3.1.0 | |
| Discourse Discourse | =3.1.0-beta1 | |
| Discourse Discourse | =3.1.0-beta2 | |
| Discourse Discourse | =3.1.0-beta3 |
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Frequently Asked Questions
What is CVE-2023-30538?
CVE-2023-30538 is a vulnerability in Discourse that allows an attacker to execute arbitrary JavaScript on users' browsers by uploading a crafted SVG file.
How can an attacker exploit CVE-2023-30538?
An attacker can exploit CVE-2023-30538 by uploading a specially crafted SVG file to the Discourse platform, which will allow them to execute arbitrary JavaScript on users' browsers.
What versions of Discourse are affected by CVE-2023-30538?
The affected versions of Discourse are: stable versions up to and including 3.0.2, beta versions up to but not including 3.1.0, and beta versions 3.1.0-beta1, 3.1.0-beta2, and 3.1.0-beta3.
How severe is CVE-2023-30538?
CVE-2023-30538 has a severity rating of medium, with a CVSS score of 5.4.
How can I fix CVE-2023-30538?
The issue is patched in the latest stable and tests-passed versions of Discourse, so updating to the latest version will fix CVE-2023-30538.
- collector/nvd-index
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/weakness
- agent/author
- agent/references
- agent/last-modified-date
- agent/title
- agent/severity
- agent/first-publish-date
- agent/event
- agent/tags
- agent/description
- vendor/discourse
- canonical/discourse discourse
- version/discourse discourse/3.0.2
- version/discourse discourse/3.1.0-beta1
- version/discourse discourse/3.1.0-beta2
- version/discourse discourse/3.1.0-beta3