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If the user added a security exception for an invalid TLS certificate, opened an ongoing TLS connection with a server that used that certificate, and then deleted the exception, Firefox would have kept the connection alive, making it seem like the certificate was still trusted. This vulnerability affects Firefox < 107.

🗓️ 03 Sep 2025 21:48:25Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 1 Views

Firefox flaw keeps an invalid certificate trusted after removing the security exception.

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03 Sep 2025 21:48Current
7High risk
Vulners AI Score7
CVSS 3.16.5
EPSS0.00204
SSVC
1