{"id":"GHSA-rvx8-p3xp-fj3p","aliases":["CVE-2023-44383"],"title":"October CMS stored XSS by authenticated backend user with improper configuration","description":"### Impact\n\nA user with access to the media manager that stores SVG files could create a stored XSS attack against themselves and any other user with access to the media manager when SVG files are supported.\n\nSVG files are supported by default in v3 for convenience; however, this has resulted in multiple mistaken vulnerability reports from security researchers. As per the documentation, if a backend user is not trusted, the advice is to remove the `svg` extension from the list of supported file types.\n\n### Patches\n\nThe issue has been patched in v3.5.2 by including an SVG sanister. It is enabled by default for new installations but must be enabled for existing sites in the **config/media.php** file.\n\n```\n'clean_vectors' => true,\n```\n\n### Workarounds\n\nIf you cannot upgrade for this patch, follow the pervious advice and remove `svg` from the supported file types.\n\n### References\n\n- https://github.com/octobercms/october/blob/3.x/config/media.php\n\nCredits to:\n- Faris Krivic\n- Okan Kurtulus\n- Aldin Visnjic\n- Bug Shankar\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Email us at [hello@octobercms.com](mailto:hello@octobercms.com)\n","severity":"medium","score":5.4,"published":"2023-11-29T21:45:31.000Z","modified":"2026-09-10T03:49:59.128Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"october/system","ranges":[{"events":[{"introduced":"3.0.0"},{"fixed":"3.5.2"}],"type":"ECOSYSTEM"}],"versions":[],"fixed":["3.5.2"]}],"sourceAffected":[],"references":["https://github.com/octobercms/october/security/advisories/GHSA-rvx8-p3xp-fj3p","https://nvd.nist.gov/vuln/detail/CVE-2023-44383","https://github.com/octobercms/october/commit/b7eed0bbf54d07ff310fcdc7037a8e8bf1f5043b","https://github.com/octobercms/october"],"sources":[{"name":"OSV","id":"GHSA-rvx8-p3xp-fj3p","modified":"2026-09-10T03:49:59.128171513Z","url":"https://osv.dev/vulnerability/GHSA-rvx8-p3xp-fj3p"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","score":5.4}]}