CVE-2023-23602

MEDIUM 6.5CVE-2023-23602 · Published 02/06/2023 · updated 17/06/2026

In short

CVE-2023-23602 is a MEDIUM (CVSS 6.5) vulnerability affecting firefox (mozilla), firefox esr (mozilla), thunderbird (mozilla).
Chance of exploitation in the next 30 days (EPSS): 0.60%, higher than 48.8% of all vulnerabilities.
Fix: update to 109.0, 102.7 or later.

Package	Affected versions	Patched versions
firefox mozilla	`< 109.0`	`109.0`
firefox esr mozilla	`< 102.7`	`102.7`
thunderbird mozilla	`< 102.7`	`102.7`

Description

A mishandled security check when creating a WebSocket in a WebWorker caused the Content Security Policy connect-src header to be ignored. This could lead to connections to restricted origins from inside WebWorkers. This vulnerability affects Firefox < 109, Firefox ESR < 102.7, and Thunderbird < 102.7.

References

bugzilla.mozilla.org/show_bug.cgi · Issue Tracking
mozilla.org/security/advisories/mfsa2023-01 · Vendor Advisory
mozilla.org/security/advisories/mfsa2023-02 · Vendor Advisory
mozilla.org/security/advisories/mfsa2023-03 · Vendor Advisory

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Package

Affected versions

Patched versions

firefox

mozilla

< 109.0

109.0

firefox esr

mozilla

< 102.7

102.7

thunderbird

mozilla

< 102.7

102.7

Description

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