Description
In Symfony before versions 4.4.7 and 5.0.7, when a `Response` does not contain a `Content-Type` header, affected versions of Symfony can fallback to the format defined in the `Accept` header of the request, leading to a possible mismatch between the response's content and `Content-Type` header. When the response is cached, this can prevent the use of the website by other users. This has been patched in versions 4.4.7 and 5.0.7.
References (4)
Core 4
Core References
Third Party Advisory x_refsource_confirm
https://github.com/symfony/symfony/security/advisories/GHSA-mcx4-f5f5-4859
Patch, Third Party Advisory x_refsource_misc
https://github.com/symfony/symfony/commit/dca343442e6a954f96a2609e7b4e9c21ed6d74e6
Third Party Advisory x_refsource_misc
https://symfony.com/blog/cve-2020-5255-prevent-cache-poisoning-via-a-response-content-type-header
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/C36JLPHUPKDFAX6D5WYFC4ALO2K7RDUQ/
Scores
CVSS v3
2.6
EPSS
0.0130
EPSS Percentile
66.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Details
CWE
CWE-20
CWE-435
Status
published
Products (3)
sensiolabs/symfony
4.4.0 - 4.4.7
symfony/http-foundation
4.4.0 - 4.4.7Packagist
symfony/symfony
4.4.0 - 4.4.7Packagist
Published
Mar 30, 2020
Tracked Since
Feb 18, 2026