CVE-2020-26962

critical

Published — · Modified —

CVSS v3

—

CVSS v2

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VIR risk

9.5

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.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2020-26962

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2020-26962.html

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-202011-12

OS impact

OS	Version	Status	Fixed in
arch		fixed	`83.0-1`
sles		affected
debian	sid	fixed	`83.0-1`

References

https://security.archlinux.org/ASA-202011-12
https://www.suse.com/security/cve/CVE-2020-26962.html
https://security-tracker.debian.org/tracker/CVE-2020-26962

Verify integrity in audit chain (admin only). AS-IS.