CVE-2020-26957 Security feature bypass in Firefox

What is CVE-2020-26957?

CVE-2020-26957 is a medium-severity vulnerability in Mozilla Firefox Mobile, published on 9 Dec 2020. 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

OneCRL was non-functional in the new Firefox for Android due to a missing service initialization. This could result in a failure to enforce some certificate revocations. *Note: This issue only affected Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 83.

Weakness: CWE-665

Which versions are affected by CVE-2020-26957?

It affects 1 product.

Products include Mozilla Firefox Mobile.

How do I fix CVE-2020-26957?

Upgrade to a fixed version.

Is CVE-2020-26957 being exploited?

There is no known exploitation of CVE-2020-26957 in the wild and no public exploit code.

Other vulnerabilities in Mozilla Firefox Mobile

• CVE-2026-84135 Other issue in Firefox Focus for Android Critical 9.8
• CVE-2024-43111 Cross-site scripting in Firefox for iOS Critical 9.8
• CVE-2023-49060 Information disclosure in Firefox for iOS Critical 9.8
• CVE-2026-92033 Privilege escalation in Firefox for Android High 8.8
• CVE-2026-84117 Privilege escalation in Firefox for Android High 8.8

All Mozilla Firefox Mobile vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-r8fq-xfh5-mvgx, UBUNTU-CVE-2020-26957.