{"id":"GHSA-m884-279h-32v2","aliases":["BIT-symfony-2020-5274","CVE-2020-5274"],"title":"Exceptions displayed in non-debug configurations in Symfony","description":"Description\n-----------\n\nWhen `ErrorHandler` renders an exception HTML page, it uses un-escaped properties from the related Exception class to render the stacktrace. The security issue comes from the fact that the stacktraces were also displayed in non-`debug` environments.\n\nResolution\n----------\n\nThe `ErrorHandler` class now escapes all properties coming from the related Exception, and the stacktrace is not displayed anymore in non-`debug` environments.\n\nThe patches for this issue are available [here](https://github.com/symfony/symfony/commit/cf80224589ac05402d4f72f5ddf80900ec94d5ad) and [here](https://github.com/symfony/symfony/commit/629d21b800a15dc649fb0ae9ed7cd9211e7e45db) for branch 4.4.\n\nCredits\n-------\n\nI would like to thank Luka Sikic for reporting & Yonel Ceruto and Jérémy Derussé for fixing the issue.","severity":"medium","score":4.6,"published":"2020-03-30T20:09:31.000Z","modified":"2026-09-10T03:48:28.735Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"symfony/error-handler","ranges":[{"events":[{"introduced":"4.4.0"},{"fixed":"4.4.4"}],"type":"ECOSYSTEM"}],"versions":["v4.4.0","v4.4.1","v4.4.2","v4.4.3"],"fixed":["4.4.4"]},{"ecosystem":"Packagist","name":"symfony/error-handler","ranges":[{"events":[{"introduced":"5.0.0"},{"fixed":"5.0.4"}],"type":"ECOSYSTEM"}],"versions":["v5.0.0","v5.0.1","v5.0.2","v5.0.3"],"fixed":["5.0.4"]},{"ecosystem":"Packagist","name":"symfony/symfony","ranges":[{"events":[{"introduced":"4.4.0"},{"fixed":"4.4.4"}],"type":"ECOSYSTEM"}],"versions":["v4.4.0","v4.4.1","v4.4.2","v4.4.3"],"fixed":["4.4.4"]},{"ecosystem":"Packagist","name":"symfony/symfony","ranges":[{"events":[{"introduced":"5.0.0"},{"fixed":"5.0.4"}],"type":"ECOSYSTEM"}],"versions":["v5.0.0","v5.0.1","v5.0.2","v5.0.3"],"fixed":["5.0.4"]}],"sourceAffected":[],"references":["https://github.com/symfony/symfony/security/advisories/GHSA-m884-279h-32v2","https://nvd.nist.gov/vuln/detail/CVE-2020-5274","https://github.com/symfony/symfony/commit/629d21b800a15dc649fb0ae9ed7cd9211e7e45db","https://github.com/symfony/symfony/commit/cf80224589ac05402d4f72f5ddf80900ec94d5ad","https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/error-handler/CVE-2020-5274.yaml","https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2020-5274.yaml","https://symfony.com/cve-2020-5274"],"sources":[{"name":"OSV","id":"GHSA-m884-279h-32v2","modified":"2026-09-10T03:48:28.735885333Z","url":"https://osv.dev/vulnerability/GHSA-m884-279h-32v2"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","score":4.6}]}