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In violation of spec, cookie prefixes such as `__Secure` were being ignored if they were not correctly capitalized - by spec they should be checked with a case-insensitive comparison. This could have resulted in the browser not correctly honoring the behaviors specified by the prefix. This vulnerability affects Firefox < 127.

🗓️ 03 Sep 2025 21:54:01Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 3 Views

Cookie prefixes were not checked case-insensitively, risking noncompliance; Firefox <127 affected.

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03 Sep 2025 21:54Current
9.2High risk
Vulners AI Score9.2
CVSS 3.19.8
EPSS0.00773
SSVC
3