Arbitrary file read via incomplete class blocklist
Published Aug 11, 2026 · Updated Aug 11, 2026
Arbitrary file read in Craft CMS 4.0.0-RC1 before 4.18.2 and 5.0.0-RC1 before 5.10.6 allows remote authenticated users to read server files. The create() Twig function permits PHP class instantiation through a five-entry blocklist that omits SplFileObject, so a crafted title or URI format opens and renders an attacker-selected path. Exploitation requires control-panel administrator access, allowAdminChanges=true, and later entry creation; disclosed server files can include credentials and application secrets.
Summary
What happened
Arbitrary file read in Craft CMS 4.0.0-RC1 before 4.18.2 and 5.0.0-RC1 before 5.10.6 allows remote authenticated users to read server files. The create() Twig function permits PHP class instantiation through a five-entry blocklist that omits SplFileObject, so a crafted title or URI format opens and renders an attacker-selected path. Exploitation requires control-panel administrator access, allowAdminChanges=true, and later entry creation; disclosed server files can include credentials and application secrets.
The record
- CVE
- CVE-2026-72779
- Published
- Aug 11, 2026
- Updated
- Aug 11, 2026
- Vendor
- Pixel & Tonic
- Product
- Craft CMS
- Classifications
- CWE-184, T1005
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Aug 11, 2026CVE publishedPublication date reported by the CVE source.
- Aug 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.
- Affected versionversion=4.0.0-RC1 <4.18.2
- Affected versionversion=5.0.0-RC1 <5.10.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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.
Public exploit references
- SplFileObject title-format proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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