Vulnerability report

Exploited in the wild High confidence Not in CISA KEV

CVE-2026-85520

Google Merchant Center Feed Arbitrary File Access

MyPresta / Google Merchant Center Feed · 1.9.1 to <= 2.3.8

View live feed Monitor via API Watch CVE-2026-85520
Severity
CVSS 9.3 · Critical
Confidence
High
Exploit status
Exploited in the wild
EPSS
—
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-85520 is an unauthenticated vulnerability affecting MyPresta Google Merchant Center Feed. Google Merchant Center Feed (gmfeed) module for PrestaShop is vulnerable to unauthenticated arbitrary file write in...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is high. Also confirmed by third-party sources.

Who is affected?

MyPresta / Google Merchant Center Feed 1.9.1 to <= 2.3.8.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Google Merchant Center Feed Arbitrary File Access

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.

MyPresta Affected
Google Merchant Center Feed
Through 2.3.8
View vendor advisory (opens in new tab)
Published
29 Sep 2026
Exploitation Reported
29 Sep 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

php

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 29 Sep 2026

A trusted third party reported exploitation.

Proof of concept available

GitHub

Recorded 29 Sep 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
CVE First 2026-09-29 11:40 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v4.0

9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

EPSS

—

Weaknesses

External Control of File Name or Path CWE-73

Recent mention · CERT Polska EN

Vulnerability in MyPresta Google Merchant Center Feed software

External control of file name or path vulnerability (CVE-2026-85520) has been found in MyPresta Google Merchant Center Feed software.

Read full advisory

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

murrez/CVE-2026-85520

github · Created 2026-09-29 13:51:05 UTC · 0 stars · AI assessment 90%

CVE-2026-85520 PoC (PoCbit) — PrestaShop MyPresta gmfeed ≤2.3.9 unauthenticated arbitrary file write via feed.php (Save to file URL) → RCE. check + exploit + mass bulk (--list -j). https://pocbit.org/pocs/cve-2026-85520

Timeline

From disclosure to observed exploitation

  1. 13:51 UTC

    Public PoC available

    Public proof-of-concept code published

  2. 11:40 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  3. 11:28 UTC

    CVE published

    Vulnerability disclosed publicly

  4. 07:37 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-85520

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-85520",
  "confidence": "High",
  "cvss_score": 9.3,
  "cvss_estimated": false,
  "epss_score": null,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}