Unauthenticated arbitrary file write leading to RCE in gmfeed PrestaShop module (CVE-2026-85520) | HOL Guard CVE

Critical · CVSS 9.3CVE-2026-85520

Unauthenticated arbitrary file write leading to RCE in gmfeed PrestaShop module

Answer in brief

CVE-2026-85520 records a Critical severity (CVSS 9.3) vulnerability in Unauthenticated arbitrary file write leading to RCE in gmfeed PrestaShop module. The current sources do not mark it as known exploited. The current feed maps MyPresta/Google Merchant Center Feed (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 29, 2026Updated Sep 29, 2026Source checked Sep 29, 2026First seen by HOL Sep 29, 2026Material review Sep 29, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 9.3. 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 MyPresta/Google Merchant Center Feed (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
MyPresta/Google Merchant Center Feedgeneric	>=1.9.1 <=2.3.8	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for MyPresta/Google Merchant Center Feed.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 29, 2026

Sources and claim methodology

Upstream source description

Google Merchant Center Feed (gmfeed) module for PrestaShop is vulnerable to unauthenticated arbitrary file write in the feed.php endpoint. An unauthenticated attacker can send a crafted request that controls the output file name, path, extension, and content through request parameters. Due to the lack of authentication and input validation, the request is processed successfully, allowing an attacker to write and execute arbitrary PHP code, resulting in remote code execution (RCE). This issue was fixed in version 2.3.9.

Quoted source text, attributed separately from HOL analysis.