Piwigo: Authenticated RCE via File Upload in Logo Upload Feature (CVE-2026-42322) | HOL Guard CVE

Critical · CVSS 9.1CVE-2026-42322

Piwigo: Authenticated RCE via File Upload in Logo Upload Feature

Answer in brief

CVE-2026-42322 records a Critical severity (CVSS 9.1) vulnerability in Piwigo: Authenticated RCE via File Upload in Logo Upload Feature. The current sources do not mark it as known exploited. The current feed maps Piwigo/Piwigo (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 25, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.1
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 9.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Piwigo/Piwigo (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Piwigo/Piwigogeneric	<16.4.0	16.4.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for Piwigo/Piwigo.
Review the reported fix. Update Piwigo/Piwigo to 16.4.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.