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6.5
CVE-2021-43540: WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with the extension. This vulnerability affect...
CVE-2021-43540 · published 4 years ago
Summary
WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with the extension. This vulnerability affects Firefox < 95.
What to do
- Update mozilla firefox to version 95.0 or later.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| mozilla | firefox |
< 95.0 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* |
Original advisory text
WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with the extension. This vulnerability affect...
WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with the extension. This vulnerability affects Firefox < 95.
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1636629 Issue Tracking Permissions Required Vendor Advisory
- https://security.gentoo.org/glsa/202202-03 Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-52/ Vendor Advisory
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit (estimated)
- Gives an attacker partial control (estimated)
Timeline
Published8 Dec 2021
Updated3 Nov 2026
First seen29 Sep 2026
Sources
CVE-2021-43540 · NVD
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