CVE-2021-45087

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-12-16 · updated 2026-06-17
Weakness: CWE-79

Description

XSS can occur in GNOME Web (aka Epiphany) before 40.4 and 41.x before 41.1 when View Source mode or Reader mode is used, as demonstrated by a a page title.

Affected products

Debian Linux: 10.0, 11.0
GNOME Epiphany: before 40.4; from 41.0 before 41.1 — fixed in 40.4, 41.1

How to fix

Upgrade to a fixed version: GNOME Epiphany 40.4, 41.1. Check the vendor advisory for mitigations.

References

https://gitlab.gnome.org/GNOME/epiphany/-/issues/1612
https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/1045
https://lists.debian.org/debian-lts-announce/2022/08/msg00006.html
https://www.debian.org/security/2022/dsa-5042
https://gitlab.gnome.org/GNOME/epiphany/-/issues/1612
https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/1045
https://lists.debian.org/debian-lts-announce/2022/08/msg00006.html
https://www.debian.org/security/2022/dsa-5042

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