CVE-2022-34477

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-12-22 · updated 2026-06-17
Weakness: CWE-203

Description

The MediaError message property should be consistent to avoid leaking information about cross-origin resources; however for a same-site cross-origin resource, the message could have leaked information enabling XS-Leaks attacks. This vulnerability affects Firefox < 102.

Affected products

Mozilla Firefox: before 102.0 — fixed in 102.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 102.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1731614
https://www.mozilla.org/security/advisories/mfsa2022-24/
https://bugzilla.mozilla.org/show_bug.cgi?id=1731614
https://www.mozilla.org/security/advisories/mfsa2022-24/
https://bugzilla.mozilla.org/show_bug.cgi?id=1731614

Get alerted when CVE-2022-34477 or the next vulnerability affects your stack