What’s Vulnerable › Vulnerabilities

CVE-2020-26962

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-09 · updated 2026-06-17
• Weakness: CWE-1021

Description

Cross-origin iframes that contained a login form could have been recognized by the login autofill service, and populated. This could have been used in clickjacking attacks, as well as be read across partitions in dynamic first party isolation. This vulnerability affects Firefox < 83.

Affected products

• Mozilla Firefox: before 83.0 — fixed in 83.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 83.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=610997
• https://www.mozilla.org/security/advisories/mfsa2020-50/
• https://bugzilla.mozilla.org/show_bug.cgi?id=610997
• https://www.mozilla.org/security/advisories/mfsa2020-50/

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