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CVE-2026-28783

Craft has a Twig Function Blocklist Bypass

Published: Mar 4, 2026Updated: Mar 5, 2026 Sources: CVE List NVD GHSACWE-94
NVD MITRE
9.1CVSSCRITICAL
EPSS Score
0.5%
Top 63.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Craft is a content management system (CMS). Prior to 5.9.0-beta.1 and 4.17.0-beta.1, Craft CMS implements a blocklist to prevent potentially dangerous PHP functions from being called via Twig non-Closure arrow functions. In order to be able to successfully execute this attack, you need to either have allowAdminChanges enabled on production, or a compromised admin account, or an account with access to the System Messages utility. Several PHP functions are not included in the blocklist, which could allow malicious actors with the required permissions to execute various types of payloads, including RCEs, arbitrary file reads, SSRFs, and SSTIs. This vulnerability is fixed in 5.9.0-beta.1 and 4.17.0-beta.1.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-94CWE-184CWE-1336

Affected Products

cmscraftcmsWeb & CMS Plugins
craftcms/cmsPackagistOSS Libraries
craft cmscraftcmsWeb & CMS Plugins
craftcmscommercialNZWeb & CMS Plugins
packagistpackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/craftcms/cms/security/advisories/GHSA-5fvc-7894-ghp4
github.com
https://github.com/craftcms/cms/pull/18208
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-28783
nvd.nist.gov
and 2 more references View all →

Timeline

Published
Mar 4, 2026
Last Updated
Mar 5, 2026

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