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CVE-2026-28695

Craft affected by authenticated RCE via Twig SSTI - create() function + Symfony Process gadget

7.5 HighPublic exploitFix available

Craft is a content management system (CMS). There is an authenticated admin RCE in Craft CMS 5.8.21 via Server-Side Template Injection using the create() Twig function combined with a Symfony Process gadget chain. The create() Twig function exposes Craft::createObject(), which allows instantiation of arbitrary PHP classes with constructor arguments. Combined with the bundled symfony/process dependency, this enables RCE. This bypasses the fix implemented for CVE-2025-57811 (patched in 5.8.7). This vulnerability is fixed in 5.9.0-beta.1 and 4.17.0-beta.1.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
High
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.66%Up 0.6 points since Mar 5, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.5

Craft affected by authenticated RCE via Twig SSTI - create() function + Symfony Process gadget

Craft is a content management system (CMS). There is an authenticated admin RCE in Craft CMS 5.8.21 via Server-Side Template Injection using the create() Twig function combined with a Symfony Process gadget chain. The create() Twig function exposes Craft::createObject(), which allows instantiation of arbitrary PHP classes with constructor arguments. Combined with the bundled symfony/process dependency, this enables RCE. This bypasses the fix implemented for CVE-2025-57811 (patched in 5.8.7). This vulnerability is fixed in 5.9.0-beta.1 and 4.17.0-beta.1.

Record
CVE-2026-28695
CVSS 4.0
7.5 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-1336
Updated
2026-11-02
EUVDEUVD-2026-9421 7.5

Craft is a content management system (CMS). There is an authenticated admin RCE in Craft CMS 5.8.21 via Server-Side Template Injection using the create() Twig function combined with a Symfony Process gadget chain. The create() Twig function exposes Craft::createObject(), which allows instantiation of arbitrary PHP classes with constructor arguments. Combined with the bundled symfony/process dependency, this enables RCE. This bypasses the fix implemented for CVE-2025-57811 (patched in 5.8.7). This vulnerability is fixed in 5.9.0-beta.1 and 4.17.0-beta.1.

Record
EUVD-2026-9421
CVSS 4.0
7.5 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-94rc-cqvm-m4pw 6.6

Craft CMS Vulnerable to Authenticated RCE via Twig SSTI - create() function + Symfony Process gadget

There is an authenticated admin RCE in Craft CMS 5.8.21 via Server-Side Template Injection using the create() Twig function combined with a Symfony Process gadget chain.

This bypasses the fix implemented for CVE-2025-57811 (patched in 5.8.7).

Required Permissions

  • Administrator permissions or access to System Messages utility
  • allowAdminChanges enabled in production (against our security recommendations) or access to System Messages utility

Vulnerability Details

The create() Twig function exposes Craft::createObject(), which allows instantiation of arbitrary PHP classes with constructor arguments. Combined with the bundled symfony/process dependency, this enables RCE.

Attack Vector

Admin panel → Settings → Entry Types → Title Format field

Proof of Concept Payload

{% set p = create("Symfony\\Component\\Process\\Process", [["id"]])
%}{{ p.mustRun.getOutput }}

Steps to Reproduce

  1. Log in as admin
  2. Navigate to Settings → Entry Types
  3. Edit any entry type’s "Title Format" field
  4. Insert the payload above
  5. Create/edit an entry of that type
  6. Command executes, output appears in entry title

Impact

  • Authenticated Remote Code Execution
  • Runs as web server user (root in default Docker setup)
  • Full server compromise

Root Cause

Craft::createObject() allows the instantiation of any class, including Symfony\Component\Process\Process, which executes shell commands.

Suggested Fix

  • Blocklist dangerous classes in createObject() when called from Twig
  • Or remove/restrict the create() Twig function
  • Or validate class names against an allowlist

Resources

https://github.com/craftcms/cms/commit/e31e50849ad71638e11ea55fbd1ed90ae8f8f6e0

Record
GHSA-94rc-cqvm-m4pw
CVSS 4.0
6.6 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
Weakness
CWE-22, CWE-94, CWE-1336
Updated
2026-11-02
NVD 7.5

Craft is a content management system (CMS). There is an authenticated admin RCE in Craft CMS 5.8.21 via Server-Side Template Injection using the create() Twig function combined with a Symfony Process gadget chain. The create() Twig function exposes Craft::createObject(), which allows instantiation of arbitrary PHP classes with constructor arguments. Combined with the bundled symfony/process dependency, this enables RCE. This bypasses the fix implemented for CVE-2025-57811 (patched in 5.8.7). This vulnerability is fixed in 5.9.0-beta.1 and 4.17.0-beta.1.

Record
CVE-2026-28695
CVSS 4.0
7.5 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
7.2 HighCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-1336
Updated
2026-11-02
OSV 7.5

Craft affected by authenticated RCE via Twig SSTI - create() function + Symfony Process gadget

Craft is a content management system (CMS). There is an authenticated admin RCE in Craft CMS 5.8.21 via Server-Side Template Injection using the create() Twig function combined with a Symfony Process gadget chain. The create() Twig function exposes Craft::createObject(), which allows instantiation of arbitrary PHP classes with constructor arguments. Combined with the bundled symfony/process dependency, this enables RCE. This bypasses the fix implemented for CVE-2025-57811 (patched in 5.8.7). This vulnerability is fixed in 5.9.0-beta.1 and 4.17.0-beta.1.

Record
CVE-2026-28695
CVSS 4.0
7.5 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-1336
Updated
2026-11-02
OSVGHSA-94rc-cqvm-m4pw 6.6

Craft CMS Vulnerable to Authenticated RCE via Twig SSTI - create() function + Symfony Process gadget

There is an authenticated admin RCE in Craft CMS 5.8.21 via Server-Side Template Injection using the create() Twig function combined with a Symfony Process gadget chain.

This bypasses the fix implemented for CVE-2025-57811 (patched in 5.8.7).

Required Permissions

  • Administrator permissions or access to System Messages utility
  • allowAdminChanges enabled in production (against our security recommendations) or access to System Messages utility

Vulnerability Details

The create() Twig function exposes Craft::createObject(), which allows instantiation of arbitrary PHP classes with constructor arguments. Combined with the bundled symfony/process dependency, this enables RCE.

Attack Vector

Admin panel → Settings → Entry Types → Title Format field

Proof of Concept Payload

{% set p = create("Symfony\\Component\\Process\\Process", [["id"]])
%}{{ p.mustRun.getOutput }}

Steps to Reproduce

  1. Log in as admin
  2. Navigate to Settings → Entry Types
  3. Edit any entry type’s "Title Format" field
  4. Insert the payload above
  5. Create/edit an entry of that type
  6. Command executes, output appears in entry title

Impact

  • Authenticated Remote Code Execution
  • Runs as web server user (root in default Docker setup)
  • Full server compromise

Root Cause

Craft::createObject() allows the instantiation of any class, including Symfony\Component\Process\Process, which executes shell commands.

Suggested Fix

  • Blocklist dangerous classes in createObject() when called from Twig
  • Or remove/restrict the create() Twig function
  • Or validate class names against an allowlist

Resources

https://github.com/craftcms/cms/commit/e31e50849ad71638e11ea55fbd1ed90ae8f8f6e0

Record
GHSA-94rc-cqvm-m4pw
CVSS 4.0
6.6 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
Weakness
CWE-1336, CWE-22, CWE-94
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
craftcms/cms
Packagist
 5.8.7 up to 5.9.0-beta.1
5.9.0-beta.1
craftcms/cms
Packagist
 4.0.0-RC1 up to 4.17.0-beta.1
4.17.0-beta.1
craftcms/cms
Packagist
 5.8.7 up to 5.9.0-beta.1, plus listed versions
5.8.105.8.115.8.125.8.135.8.13.1
Show 13 moreShow less
5.8.13.25.8.145.8.155.8.165.8.175.8.185.8.195.8.205.8.215.8.225.8.235.8.85.8.9
5.9.0-beta.1
craftcms/cms
Packagist
 4.0.0-RC1 up to 4.17.0-beta.1, plus listed versions
4.0.04.0.0-RC24.0.0-RC34.0.0.14.0.1
Show 45 moreShow less
4.0.24.0.34.0.44.0.54.0.5.14.0.5.24.0.64.1.04.1.0.14.1.0.24.1.14.1.24.1.34.1.44.1.4.14.10.04.10.0-beta.14.10.0-beta.24.10.14.10.24.10.34.10.44.10.54.10.64.10.74.10.84.11.04.11.0.14.11.0.24.11.14.11.24.11.34.11.44.11.54.12.04.12.14.12.24.12.34.12.44.12.4.14.12.54.12.64.12.6.14.12.74.12.8
4.17.0-beta.1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHubgbuyssens/CVE-2026-28695-craft-rce-bypass2026-09-27
PoC in GitHubpredyy/CVE-2026-286952026-09-27

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-28695 is a high vulnerability (CVSS 7.5) in Craftcms Cms, published March 3, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.66%, the 51st percentile. Fixed in craftcms/cms 5.9.0-beta.1.

References

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Left out here: 178 versions. The JSON record has them.

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