Camaleon CMS vulnerable to stored XSS through user file upload (GHSL-2024-184)

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

4.8 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N · score source

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

A stored cross-site scripting has been found in the image upload functionality that can be used by normal registered users: It is possible to upload a SVG image containing JavaScript and it's also possible to upload a HTML document when the format parameter is manually changed to [documents][1] or a string of an [unsupported format][2]. If an authenticated user or administrator visits that uploaded image or document malicious JavaScript can be executed on their behalf (e.g. changing or deleting content inside of the CMS.) [1]: https://github.com/owen2345/camaleon-cms/blob/feccb96e542319ed608acd3a16fa5d92f13ede67/app/uploaders/camaleoncmsuploader.rb#L105-L106 [2]: https://github.com/owen2345/camaleon-cms/blob/feccb96e542319ed608acd3a16fa5d92f13ede67/app/uploaders/camaleoncmsuploader.rb#L110-L111 Impact This issue may lead to account takeover due to reflected Cross-site scripting (XSS). Remediation Only allow the upload of safe files such as PNG, TXT and others or serve all "unsafe"…

Published by the source

25 Sep 2024, 21:53 UTC

Last modified by the source

25 Sep 2024, 21:53 UTC

Source last checked

26 Oct 2026, 15:48 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-75j2-9gmc-m855

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# Patch Next advisory brief: GHSA-75j2-9gmc-m855

Advisory: Camaleon CMS vulnerable to stored XSS through user file upload (GHSL-2024-184)
IDs: GHSA-75j2-9gmc-m855
Record: https://patchnext.com/advisories/ghsa-75j2-9gmc-m855 (revision 1, source checked 26 Oct 2026, 15:48 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: camaleon_cms 2.8.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- RubyGems camaleon_cms: affected >= 2.8.0, < 2.8.2; fixed in 2.8.2

## Suggested inspection (read-only)
- RubyGems camaleon_cms: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on camaleon_cms.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-75j2-9gmc-m855 (GitHub-reviewed advisory GHSA-75j2-9gmc-m855 lists affected ranges: RubyGems camaleon_cms >=2.8.0 <2.8.2)

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