CVE-2026-42607Public exploitNetwork attack vector

Administrative code execution via unsafe ZIP extraction

Published May 11, 2026 · Updated May 11, 2026

Path traversal in Grav before 2.0.0-beta.2 allows remote authenticated users with administrative privileges to execute code via a crafted ZIP. Installer::unZip passes archive entries to ZipArchive::extractTo without first rejecting traversal, absolute-path, or NUL-containing names, allowing writes beyond the designated plugin or theme directory. The Admin plugin and direct-install permission are required, and a successful write can place executable PHP or a persistent web shell on the server.

CVSS severity9.1
Critical
EPSS probability3.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Grav before 2.0.0-beta.2 allows remote authenticated users with administrative privileges to execute code via a crafted ZIP. Installer::unZip passes archive entries to ZipArchive::extractTo without first rejecting traversal, absolute-path, or NUL-containing names, allowing writes beyond the designated plugin or theme directory. The Admin plugin and direct-install permission are required, and a successful write can place executable PHP or a persistent web shell on the server.

The record

CVE
CVE-2026-42607
Published
May 11, 2026
Updated
May 11, 2026
Vendor
Grav
Product
Grav
Classifications
CWE-94, T1505.003, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 11, 2026CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=< 2.0.0-beta.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Grav · Gravversion=< 2.0.0-beta.2

Published CVSS scores

9.1GitHubCVSS:3.1/AV:N/AC:L/PR:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1505.003Server Software Component: Web Shell
T1190Exploit Public-Facing Application

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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