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CVE-2026-28695 — cms

Fix: craftcms/cms@e31e508

CVE-2026-28695 is a CWE-1336 vulnerability in craftcms/cms. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for craftcms/cms — see the affected versions and patch details below.

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

Also known asGHSA-94rc-cqvm-m4pw
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
1 known
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • A successful exploit gives an attacker total control of the affected component, not partial access.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-28695.

EPSS Exploitation Probability

via FIRST.org ↗
0.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs52th percentile — riskier than 52% of all scored CVEsHighest risk
0.00%0.39%0.77%1.16%0.0%0.7%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

2 pkgs affected
🐘craftcms/cms🐘craftcms/cms

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistcraftcms/cms≥ 5.8.7&&< 5.9.0-beta.15.9.0-beta.1composer require craftcms/cms:^5.9.0-beta.1
🐘Packagistcraftcms/cms≥ 4.0.0-RC1&&< 4.17.0-beta.14.17.0-beta.1composer require craftcms/cms:^4.17.0-beta.1

Affected Products

1 product · 8 configurations
Application
craft cmscraftcms
> 5.0.0 && < 5.9.0
2 versions
4.0.05.0.0
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

predyy/CVE-2026-28695

CVE-2026-28695 PoC - Authenticated blind remote code execution in Craft

⭐ 13🍴 0Sep 2026

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for craftcms/cms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update craftcms/cms to 5.9.0-beta.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-28695 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

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](https://craftcms.com/knowledge-base/securing-craft#set-allowAdminChanges-to-false-in-production)) or access to System Messages utility ## Vulnerability Details The `create()` Tw
O3 Security · Impact-Aware SCA

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CVE-2026-28695: cms RCE — Fixed in 5.9.0-beta.1