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GHSA-q847-2q57-wmr3
No affected components available
Description
Some Twig filters in CodeExtension use "is_safe=html" but don't actually ensure their input is safe.
Resolution
Symfony now escapes the output of the affected filters.
The patch for this issue is available here for branch 4.4.
Credits
We would like to thank Pierre Rudloff for reporting the issue and to Nicolas Grekas for providing the fix.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a low impact on the confidentiality of the information. There is a low impact on the integrity of the data.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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