CVE-2020-5274: Fix Exception message escaping rendered by ErrorHandler
Symfony 4.4.0 to 4.4.3 and 5.0.0 to 5.0.4 versions of the Symfony ErrorHandler component are affected by this security issue.
The issue has been fixed in Symfony 4.4.4 and 5.0.4.
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-
ErrorHandler class now escapes all properties coming from the related Exception, and the stacktrace is not displayed anymore in non-
I would like to thank Luka Sikic for reporting & Yonel Ceruto and Jérémy Derussé for fixing the issue.
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