What is CVE-2022-4055?

CVE-2022-4055 is a high-severity vulnerability in Freedesktop Xdg-Utils, classified under CWE-146. CVSS score: 7.4/10. Published 2022-11-19.

How severe is CVE-2022-4055?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in Freedesktop Xdg-Utils

CVE-2022-4055

When xdg-mail is configured to use thunderbird for mailto URLs, improper parsing of the URL can lead to additional headers being passed to thunderbird that should not be included per RFC 2368. An attacker can use this method to create a mailto URL that looks safe to users, but will actually attach files when clicked.

Published 2022-11-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.007 (50.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.000

Affected products

Freedesktop Xdg-Utils
Xdg-Utils — versions xdg-utils 1.1.0 to and including 1.1.3

Weakness classification (CWE)

CWE-146

References

gitlab.freedesktop.org/xdg/xdg-utils/-/issues/205 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2022-4055?: CVE-2022-4055 is a high-severity vulnerability in Freedesktop Xdg-Utils, classified under CWE-146. CVSS score: 7.4/10. Published 2022-11-19.
How severe is CVE-2022-4055?: High severity. CVSS v3 base score is 7.4 out of 10.