SameSite cookie bypass via FetchEvent origin loss
Published Dec 22, 2022 · Updated Apr 15, 2025
SameSite policy bypass in Mozilla Firefox before 107 allows remote attackers to send protected cookies cross-site via ServiceWorker requests. When a ServiceWorker handles a FetchEvent, Firefox loses the request origin after transferring ownership, so SameSite restrictions are not enforced and cookies intended to resist cross-site requests can accompany attacker-triggered traffic. Exploitation requires a victim to load a site using a ServiceWorker and interact with attacker-controlled cross-site content; the demonstrated consequence is integrity impact such as CSRF-style actions, without direct cookie disclosure.
Summary
What happened
SameSite policy bypass in Mozilla Firefox before 107 allows remote attackers to send protected cookies cross-site via ServiceWorker requests. When a ServiceWorker handles a FetchEvent, Firefox loses the request origin after transferring ownership, so SameSite restrictions are not enforced and cookies intended to resist cross-site requests can accompany attacker-triggered traffic. Exploitation requires a victim to load a site using a ServiceWorker and interact with attacker-controlled cross-site content; the demonstrated consequence is integrity impact such as CSRF-style actions, without direct cookie disclosure.
The record
- CVE
- CVE-2022-45410
- Published
- Dec 22, 2022
- Updated
- Apr 15, 2025
- Vendor
- Mozilla
- Product
- Firefox
- Classifications
- CWE-862, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 22, 2022CVE publishedPublication date reported by the CVE source.
- Apr 15, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=unspecified <107
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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