CVE-2026-66627Network attack vector

Arbitrary file upload via Font Library API

Published Aug 18, 2026 · Updated Aug 18, 2026

Arbitrary file upload in EDGE22 Studios Ltd. GP Premium before 2.5.6 allows remote authenticated users to write files via the Font Library feature. GeneratePress states that the vulnerable path is the Font Library REST API, where 2.5.6 hardens permissions and remote font installation validation after contributors could upload arbitrary files. Exploitation requires at least Contributor access and reaches sites that expose the Font Library workflow; successful uploads can place attacker-controlled content on the server, with code execution depending on where the uploaded file lands and how the host handles it.

CVSS severity9.9
Critical
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in EDGE22 Studios Ltd. GP Premium before 2.5.6 allows remote authenticated users to write files via the Font Library feature. GeneratePress states that the vulnerable path is the Font Library REST API, where 2.5.6 hardens permissions and remote font installation validation after contributors could upload arbitrary files. Exploitation requires at least Contributor access and reaches sites that expose the Font Library workflow; successful uploads can place attacker-controlled content on the server, with code execution depending on where the uploaded file lands and how the host handles it.

The record

CVE
CVE-2026-66627
Published
Aug 18, 2026
Updated
Aug 18, 2026
Vendor
EDGE22 Studios Ltd.
Product
GP Premium
Classifications
CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a <=2.5.5 changes=[{"at":"2.5.6","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

EDGE22 Studios Ltd. · GP Premiumversion=n/a <=2.5.5 changes=[{"at":"2.5.6","status":"unaffected"}]

Published CVSS scores

9.9PatchstackCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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