{"id":"GHSA-75j2-9gmc-m855","aliases":[],"status":"published","title":"Camaleon CMS vulnerable to stored XSS through user file upload (GHSL-2024-184)","description":"A stored cross-site scripting has been found in the image upload functionality that can be used by normal registered users:\nIt is possible to upload a SVG image containing JavaScript and it's also possible to upload a HTML document when the format\nparameter 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.)\n\n[1]: https://github.com/owen2345/camaleon-cms/blob/feccb96e542319ed608acd3a16fa5d92f13ede67/app/uploaders/camaleon_cms_uploader.rb#L105-L106\n[2]: https://github.com/owen2345/camaleon-cms/blob/feccb96e542319ed608acd3a16fa5d92f13ede67/app/uploaders/camaleon_cms_uploader.rb#L110-L111\n\n## Impact\n\nThis issue may lead to account takeover due to reflected Cross-site scripting (XSS).\n\n## Remediation\n\nOnly allow the upload of safe files such as PNG, TXT and others or serve all \"unsafe\" files such as SVG and other files with a content-disposition: attachment header, which should prevent browsers from displaying them.\n\nAdditionally, a [Content security policy (CSP)][3] can be created that disallows inlined script. (Other parts of the application might need modification to continue functioning.)\n\n[3]: https://web.dev/articles/csp\n\nTo prevent the theft of the auth_token it could be marked with HttpOnly. This would however not prevent that actions could be performed as the authenticated user/administrator. Furthermore, it could make sense to use the authentication provided by Ruby on Rails, so that stolen tokens cannot be used anymore after some time.","severity":{"version":"4.0","score":4.8,"vector":"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","level":"medium","from":"ghsa"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2024-09-25T21:53:27Z","modified":"2024-12-05T05:39:56Z","fixes":[{"ecosystem":"RubyGems","package":"camaleon_cms","fixed_in":["2.8.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"RubyGems","package":"camaleon_cms","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.8.0"},{"fixed":"2.8.2"}]}]},{"source":"osv","ecosystem":"RubyGems","package":"camaleon_cms","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.8.0"},{"fixed":"2.8.2"}]}],"versions":["2.8.0","2.8.1"]}],"references":[{"url":"https://github.com/owen2345/camaleon-cms/security/advisories/GHSA-r9cr-qmfw-pmrc","tags":["web"]},{"url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/camaleon_cms/GHSA-8fx8-3rg2-79xw.yml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-75j2-9gmc-m855"},{"url":"https://github.com/owen2345/camaleon-cms","tags":["package"]}],"sources":{"ghsa":[{"id":"GHSA-75j2-9gmc-m855","title":"Camaleon CMS vulnerable to stored XSS through user file upload (GHSL-2024-184)","description":"A stored cross-site scripting has been found in the image upload functionality that can be used by normal registered users:\nIt is possible to upload a SVG image containing JavaScript and it's also possible to upload a HTML document when the format\nparameter 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.)\n\n[1]: https://github.com/owen2345/camaleon-cms/blob/feccb96e542319ed608acd3a16fa5d92f13ede67/app/uploaders/camaleon_cms_uploader.rb#L105-L106\n[2]: https://github.com/owen2345/camaleon-cms/blob/feccb96e542319ed608acd3a16fa5d92f13ede67/app/uploaders/camaleon_cms_uploader.rb#L110-L111\n\n## Impact\n\nThis issue may lead to account takeover due to reflected Cross-site scripting (XSS).\n\n## Remediation\n\nOnly allow the upload of safe files such as PNG, TXT and others or serve all \"unsafe\" files such as SVG and other files with a content-disposition: attachment header, which should prevent browsers from displaying them.\n\nAdditionally, a [Content security policy (CSP)][3] can be created that disallows inlined script. (Other parts of the application might need modification to continue functioning.)\n\n[3]: https://web.dev/articles/csp\n\nTo prevent the theft of the auth_token it could be marked with HttpOnly. This would however not prevent that actions could be performed as the authenticated user/administrator. Furthermore, it could make sense to use the authentication provided by Ruby on Rails, so that stolen tokens cannot be used anymore after some time.\n","status":"published","published":"2024-09-25T21:53:27Z","modified":"2024-09-25T21:53:27Z","cvss":[{"version":"4.0","score":4.8,"vector":"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","level":"medium"},{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:38:06.29677Z"}],"osv":[{"id":"GHSA-75j2-9gmc-m855","title":"Camaleon CMS vulnerable to stored XSS through user file upload (GHSL-2024-184)","description":"A stored cross-site scripting has been found in the image upload functionality that can be used by normal registered users:\nIt is possible to upload a SVG image containing JavaScript and it's also possible to upload a HTML document when the format\nparameter 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.)\n\n[1]: https://github.com/owen2345/camaleon-cms/blob/feccb96e542319ed608acd3a16fa5d92f13ede67/app/uploaders/camaleon_cms_uploader.rb#L105-L106\n[2]: https://github.com/owen2345/camaleon-cms/blob/feccb96e542319ed608acd3a16fa5d92f13ede67/app/uploaders/camaleon_cms_uploader.rb#L110-L111\n\n## Impact\n\nThis issue may lead to account takeover due to reflected Cross-site scripting (XSS).\n\n## Remediation\n\nOnly allow the upload of safe files such as PNG, TXT and others or serve all \"unsafe\" files such as SVG and other files with a content-disposition: attachment header, which should prevent browsers from displaying them.\n\nAdditionally, a [Content security policy (CSP)][3] can be created that disallows inlined script. (Other parts of the application might need modification to continue functioning.)\n\n[3]: https://web.dev/articles/csp\n\nTo prevent the theft of the auth_token it could be marked with HttpOnly. This would however not prevent that actions could be performed as the authenticated user/administrator. Furthermore, it could make sense to use the authentication provided by Ruby on Rails, so that stolen tokens cannot be used anymore after some time.\n","status":"published","published":"2024-09-25T21:53:27Z","modified":"2024-12-05T05:39:56.339159Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"},{"version":"4.0","score":4.8,"vector":"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","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:40.657155Z"}]}}