Neos CMS Cross Site Scripting vulnerability
Cross Site Scripting (XSS) vulnerability in Neos CMS 8.3.3 allows a remote authenticated attacker to execute arbitrary code via a crafted SVG file uploaded to the neos/management/media component. To make use of this attack vector, the attacker must either be able to upload a maliciously crafted file or coerce someone with the needed access to upload said file to Neos. Even if such a file is uploaded and subsequently delivered, it is possible to use CSP to protect against attacks being executed from such a file.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | neos/media-browser | < 7.3.19, >= 8.0.0, < 8.0.16, >= 8.1.0, < 8.1.11, >= 8.2.0, < 8.2.11, >= 8.3.0, < 8.3.9 | 7.3.19, 8.0.16, 8.1.11, 8.2.11, 8.3.9 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2023-37611
- https://github.com/neos/neos-development-collection/issues/4833
- https://github.com/neos/neos-development-collection/pull/4812
- https://github.com/neos/neos-development-collection/commit/4ac0df04d2e44e164e95887b466075dde3f04045
- https://cheatsheetseries.owasp.org/cheatsheets/Content_Security_Policy_Cheat_Sheet.html
- https://digi.ninja/blog/svg_xss.php
- https://github.com/neos/neos-development-collection
- https://github.com/neos/neos-ui/releases/tag/8.3.4
- https://rodelllemit.medium.com/stored-xss-in-neo-cms-8-3-3-9bd1cb973c5b
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- Composer
- Package
neos/media-browser- Disclosed
- 19.09.2023
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-6qjf-7g3j-qx25 - CC BY 4.0
Vulnerability history: neos/media-browser
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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