What is CVE-2022-34009?

CVE-2022-34009 is a medium-severity vulnerability in Fossil-Scm Fossil, classified under Cross-site Scripting. CVSS score: 5.5/10. Published 2022-07-28.

How severe is CVE-2022-34009?

Medium severity. CVSS v3 base score is 5.5 out of 10.

XSS in Fossil-Scm Fossil

CVE-2022-34009

Fossil 2.18 on Windows allows attackers to cause a denial of service (daemon crash) via an XSS payload in a ticket. This occurs because the ticket data is stored in a temporary file, and the product does not properly handle the absence of this file after Windows Defender has flagged it as malware.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-07-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (27.8th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Fossil-Scm Fossil — versions 2.18
Microsoft Windows

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

fossil-scm.org/home/doc/trunk/www/changes.wiki (Vendor Advisory)
gainsec.com/2022/07/27/cve-2022-34009/ (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2022-34009?: CVE-2022-34009 is a medium-severity vulnerability in Fossil-Scm Fossil, classified under Cross-site Scripting. CVSS score: 5.5/10. Published 2022-07-28.
How severe is CVE-2022-34009?: Medium severity. CVSS v3 base score is 5.5 out of 10.