What is CVE-2026-42322?

CVE-2026-42322 is a critical-severity vulnerability in Piwigo, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.1/10. Published 2026-09-25.

How severe is CVE-2026-42322?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Arbitrary file upload in Piwigo

CVE-2026-42322

Piwigo is a full featured open source photo gallery application for the web. Prior to 16.4.0, admin/themes_standard_pages.php validates uploaded logo content by MIME type but reuses the attacker-controlled extension from std_pgs_logo when constructing the stored filename. An authenticated administrator can upload image content with a server-executable final extension, causing the file to be placed in the web-accessible logo directory and executed when requested if the web server handles that extension. This can permit arbitrary command execution, data disclosure, modification, persistence, and service disruption. This vulnerability is fixed in 16.4.0.

Vulnerability class: Unrestricted File Upload

Published 2026-09-25 · last modified 2026-09-25.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Piwigo — versions < 16.4.0

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

Frequently asked questions

What is CVE-2026-42322?: CVE-2026-42322 is a critical-severity vulnerability in Piwigo, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.1/10. Published 2026-09-25.
How severe is CVE-2026-42322?: Critical severity. CVSS v3 base score is 9.1 out of 10.