CVE-2021-45087

Name: CVE-2021-45087
Creator: NVD / NIST
Published: 2021-12-16T03:15:10.31+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.49%

Last modified Jun 17, 2026

CVE-2021-45087 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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.. EPSS estimates a 1.49% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

1.49%

70.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Gnome	Epiphany	< 40.4
Gnome	Epiphany	>= 41.0, < 41.1
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0

References

https://gitlab.gnome.org/GNOME/epiphany/-/issues/1612Exploit, Vendor Advisory
https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/1045Patch, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2022/08/msg00006.htmlMailing List, Third Party Advisory
https://www.debian.org/security/2022/dsa-5042Third Party Advisory
https://gitlab.gnome.org/GNOME/epiphany/-/issues/1612Exploit, Vendor Advisory
https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/1045Patch, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2022/08/msg00006.htmlMailing List, Third Party Advisory
https://www.debian.org/security/2022/dsa-5042Third Party Advisory

Timeline

Published: Dec 16, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-45087?

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.

How severe is CVE-2021-45087?

CVE-2021-45087 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.49% probability of exploitation in the next 30 days.

How do I fix CVE-2021-45087?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-45087?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST