CVE-2022-29912 Other in Firefox

Q: Is CVE-2022-29912 being exploited?

There is no known exploitation of CVE-2022-29912 in the wild and no public exploit code.

Medium 6.1 Published 22 Dec 2022 Updated 15 Apr 2025

Reader mode failed to omit SameSite cookies, allowing potential security bypasses in Firefox and Thunderbird.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2022-29912?

CVE-2022-29912 is a medium-severity vulnerability in Mozilla Firefox, published on 22 Dec 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Requests initiated through reader mode did not properly omit cookies with a SameSite attribute. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.

Weakness: CWE-601

Which versions are affected by CVE-2022-29912?

It affects 3 products.

Products include Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.

How do I fix CVE-2022-29912?

Upgrade to a fixed version.

Is CVE-2022-29912 being exploited?

There is no known exploitation of CVE-2022-29912 in the wild and no public exploit code.

All Mozilla Firefox vulnerabilities

Sources

Also known as DEBIAN-CVE-2022-29912, GHSA-qf7x-w4mc-mcp8, UBUNTU-CVE-2022-29912.