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When a ServiceWorker intercepted a request with <code>FetchEvent</code>, the origin of the request was lost after the ServiceWorker took ownership of it. This had the effect of negating SameSite cookie protections. This was addressed in the spec and then in browsers. This vulnerability affects Firefox ESR < 102.5, Thunderbird < 102.5, and Firefox < 107.

🗓️ 04 Sep 2025 03:26:05Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 1 Views

ServiceWorker FetchEvent loses origin, breaking SameSite; fixed; affects Firefox ESR 102.5, Thunderbird 102.5, and Firefox 107.

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04 Sep 2025 03:26Current
7High risk
Vulners AI Score7
CVSS 3.16.5
EPSS0.00153
SSVC
1