What is the CVSS score of CVE-2026-28697?

CVE-2026-28697 has a CVSS 3.1 base score of 9.1 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.5%.

Which versions of PHP are affected by CVE-2026-28697?

A critical vulnerability in Craft CMS allows authenticated administrators to execute arbitrary code on affected systems, potentially enabling data theft, system compromise, or service disruption.. A patch is available.

Is there a public PoC exploit available for CVE-2026-28697?

Yes, a public proof-of-concept exploit is available for CVE-2026-28697. Prioritise patching immediately. EPSS: 0.5%.

How to fix or mitigate CVE-2026-28697?

Within 24 hours: Identify all systems running affected Craft CMS versions and assess administrator access logs for suspicious template modifications. Within 7 days: Apply vendor patches to upgrade to version 4.17.0-beta.1 or 5.9.0-beta.1 or later across all instances. Within 30 days: Conduct a full security audit of template configurations and administrator accounts to detect any unauthorized changes or lateral movement.

PHP CVE-2026-28697

CRITICAL

Improper Neutralization of Special Elements Used in a Template Engine (CWE-1336)

2026-03-04 security-advisories@github.com

GHSA-v47q-jxvr-p68x

PHP RCE Craft Cms

9.1

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

9.1 CRITICAL

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:05 vuln.today

PoC Detected

Mar 05, 2026 - 10:37 vuln.today

Public exploit code

Patch released

Mar 05, 2026 - 10:37 nvd

Patch available

CVE Published

Mar 04, 2026 - 17:16 nvd

CRITICAL 9.1

DescriptionGitHub Advisory

Craft is a content management system (CMS). Prior to 4.17.0-beta.1 and 5.9.0-beta.1, an authenticated administrator can achieve Remote Code Execution (RCE) by injecting a Server-Side Template Injection (SSTI) payload into Twig template fields (e.g., Email Templates). By calling the craft.app.fs.write() method, an attacker can write a malicious PHP script to a web-accessible directory and subsequently access it via the browser to execute arbitrary system commands. This vulnerability is fixed in 4.17.0-beta.1 and 5.9.0-beta.1.