CVE-2026-85520

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 1.0% (61st percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.0%CVSS: 9.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
9.3
EG Score
9.3CRITICALmedium confidence
EG Risk
57
EG Risk 57/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity93% × 45%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.0%
EPSS %ILE
61st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 29, 2026

Last Modified

September 30, 2026

Advisory Details (2)

Auto-updated Oct 3, 2026
Patch available.
generic

Fix Google Merchant Center Feed Security Issue in PrestaShop

https://mypresta.eu/news/google-merchant-center-security-fix-2026.html
generic Patch Available

Vulnerability in MyPresta Google Merchant Center Feed software | CERT Polska

https://cert.pl/en/posts/2026/09/CVE-2026-85520

Vendor Advisories for CVE-2026-85520(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 43× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-04 07:53 UTCGHSA enrichment
  2. 2026-10-04 03:39 UTCGHSA enrichment
  3. 2026-10-03 23:29 UTCGHSA enrichment
  4. 2026-10-03 19:17 UTCGHSA enrichment
  5. 2026-10-03 15:07 UTCEG score recompute
  6. 2026-10-03 15:07 UTCGHSA enrichment
  7. 2026-10-03 14:26 UTCEPSS rescore
  8. 2026-10-03 10:53 UTCGHSA enrichment
  9. 2026-10-03 06:42 UTCGHSA enrichment
  10. 2026-10-03 02:31 UTCGHSA enrichment
  11. 2026-10-02 22:20 UTCGHSA enrichment
  12. 2026-10-02 18:09 UTCEG score recompute
  13. 2026-10-02 18:09 UTCGHSA enrichment
  14. 2026-10-02 17:57 UTCEPSS rescore
  15. 2026-10-02 13:57 UTCGHSA enrichment
  16. 2026-10-02 09:46 UTCGHSA enrichment
  17. 2026-10-02 05:36 UTCGHSA enrichment
  18. 2026-10-02 01:21 UTCGHSA enrichment
  19. 2026-10-01 21:10 UTCEG score recompute
  20. 2026-10-01 21:10 UTCGHSA enrichment
  21. 2026-10-01 19:50 UTCEPSS rescore
  22. 2026-10-01 17:00 UTCGHSA enrichment
  23. 2026-10-01 12:46 UTCGHSA enrichment
  24. 2026-10-01 08:35 UTCGHSA enrichment
  25. 2026-10-01 04:25 UTCGHSA enrichment
Show 18 more
  1. 2026-10-01 00:14 UTCGHSA enrichment
  2. 2026-09-30 20:02 UTCGHSA enrichment
  3. 2026-09-30 16:44 UTCEG score recompute
  4. 2026-09-30 16:44 UTCGHSA enrichment
  5. 2026-09-30 15:04 UTCEPSS rescore
  6. 2026-09-30 12:30 UTCGHSA enrichment
  7. 2026-09-30 08:19 UTCGHSA enrichment
  8. 2026-09-30 04:08 UTCGHSA enrichment
  9. 2026-09-29 23:49 UTCGHSA enrichment
  10. 2026-09-29 19:38 UTCGHSA enrichment
  11. 2026-09-29 15:24 UTCEG score recompute
  12. 2026-09-29 15:24 UTCGHSA enrichment
  13. 2026-09-29 15:09 UTCEG score recompute
  14. 2026-09-29 15:09 UTCGHSA enrichment
  15. 2026-09-29 12:33 UTCEG score recompute
  16. 2026-09-29 12:33 UTCGHSA enrichment
  17. 2026-09-29 11:35 UTCEG score recompute
  18. 2026-09-29 11:33 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-85520?
CVE-2026-85520 is a critical vulnerability published on September 29, 2026. 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…
When was CVE-2026-85520 disclosed?
CVE-2026-85520 was first published on September 29, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-85520 actively exploited?
CVE-2026-85520 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.0% probability of exploitation in the next 30 days (61st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-85520?
CVE-2026-85520 has a CVSS base score of 9.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-85520?
A fix for CVE-2026-85520 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-85520 are linked in the Vendor Advisories panel on this page.

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