CVE-2026-61457Public exploitNetwork attack vector

Authenticated code execution via double-extension file upload

Published Jul 15, 2026 · Updated Jul 15, 2026

Unrestricted file upload in the Grav API plugin before 1.0.3 allows remote authenticated users to execute PHP via crafted filenames. HandlesMediaUploads::validateFileExtension() checks only the final suffix against a dangerous-extension blocklist, allowing an embedded PHP extension to pass. Remote authenticated users need api.media.write permission, and execution requires a web server that treats the double-extension file as PHP; otherwise, PHP source is exposed.

CVSS severity5.3
Medium
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in the Grav API plugin before 1.0.3 allows remote authenticated users to execute PHP via crafted filenames. HandlesMediaUploads::validateFileExtension() checks only the final suffix against a dangerous-extension blocklist, allowing an embedded PHP extension to pass. Remote authenticated users need api.media.write permission, and execution requires a web server that treats the double-extension file as PHP; otherwise, PHP source is exposed.

The record

CVE
CVE-2026-61457
Published
Jul 15, 2026
Updated
Jul 15, 2026
Vendor
Grav
Product
Grav
Classifications
CWE-434, T1190, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 15, 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=0 <1.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Grav · Gravversion=0 <1.0.3

Published CVSS scores

5.4GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
5.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application
T1505.003Web Shell

Public exploit references

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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