Craft CMS prior 4.17.0-beta.1/5.9.0-beta.1 craft.app.fs.write special elements used in a template engine

CVSS Meta Temp Score
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CTI Interest Score
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6.8$0-$5k0.00

Summaryinfo

A vulnerability was found in Craft CMS and classified as problematic. This vulnerability affects the function craft.app.fs.write. Such manipulation leads to improper neutralization of special elements used in a template engine. This vulnerability is listed as CVE-2026-28697. The attack may be performed from remote. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Craft CMS. It has been rated as problematic. Affected by this issue is the function craft.app.fs.write. The manipulation with an unknown input leads to a improper neutralization of special elements used in a template engine vulnerability. Using CWE to declare the problem leads to CWE-1336. The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-28697 since 03/02/2026. The exploitation is known to be easy. The attack may be launched remotely. Additional levels of successful authentication are necessary for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1221 by the MITRE ATT&CK project.

Upgrading to version 4.17.0-beta.1 or 5.9.0-beta.1 eliminates this vulnerability. Applying the patch 9dc2a4a3ec8e9cd5e8c0d1129f36371437519197 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.8

VulDB Base Score: 4.7
VulDB Temp Score: 4.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 9.1
NVD Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper neutralization of special elements used in a template engine
CWE: CWE-1336 / CWE-791 / CWE-790
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: CMS 4.17.0-beta.1/5.9.0-beta.1
Patch: 9dc2a4a3ec8e9cd5e8c0d1129f36371437519197

Timelineinfo

03/02/2026 CVE reserved
03/04/2026 +2 days Advisory disclosed
03/04/2026 +0 days VulDB entry created
03/05/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: GHSA-v47q-jxvr-p68x
Status: Confirmed

CVE: CVE-2026-28697 (🔒)
GCVE (CVE): GCVE-0-2026-28697
GCVE (VulDB): GCVE-100-348758

Entryinfo

Created: 03/04/2026 18:34
Updated: 03/05/2026 12:10
Changes: 03/04/2026 18:34 (69), 03/05/2026 12:10 (11)
Complete: 🔍
Cache ID: 216::103

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