CVE-2026-31857
CraftCMS has an RCE vulnerability via relational conditionals in the control panel
Craft is a content management system (CMS). Prior to 5.9.9 and 4.17.4, a Remote Code Execution vulnerability exists in the Craft CMS 5 conditions system. The BaseElementSelectConditionRule::getElementIds() method passes user-controlled string input through renderObjectTemplate() -- an unsandboxed Twig rendering function with escaping disabled. Any authenticated Control Panel user (including non-admin roles such as Author or Editor) can achieve full RCE by sending a crafted condition rule via standard element listing endpoints. This vulnerability requires no admin privileges, no special permissions beyond basic control panel access, and bypasses all production hardening settings (allowAdminChanges: false, devMode: false, enableTwigSandbox: true). Users should update to the patched 5.9.9 or 4.17.4 release to mitigate the issue.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
CraftCMS has an RCE vulnerability via relational conditionals in the control panel
Craft is a content management system (CMS). Prior to 5.9.9 and 4.17.4, a Remote Code Execution vulnerability exists in the Craft CMS 5 conditions system. The BaseElementSelectConditionRule::getElementIds() method passes user-controlled string input through renderObjectTemplate() -- an unsandboxed Twig rendering function with escaping disabled. Any authenticated Control Panel user (including non-admin roles such as Author or Editor) can achieve full RCE by sending a crafted condition rule via standard element listing endpoints. This vulnerability requires no admin privileges, no special permissions beyond basic control panel access, and bypasses all production hardening settings (allowAdminChanges: false, devMode: false, enableTwigSandbox: true). Users should update to the patched 5.9.9 or 4.17.4 release to mitigate the issue.
- Record
CVE-2026-31857- CVSS 4.0
- 8.1 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U - Weakness
- CWE-94
- Updated
- 2026-11-02
EUVDEUVD-2026-11257
Craft is a content management system (CMS). Prior to 5.9.9 and 4.17.4, a Remote Code Execution vulnerability exists in the Craft CMS 5 conditions system. The BaseElementSelectConditionRule::getElementIds() method passes user-controlled string input through renderObjectTemplate() -- an unsandboxed Twig rendering function with escaping disabled. Any authenticated Control Panel user (including non-admin roles such as Author or Editor) can achieve full RCE by sending a crafted condition rule via standard element listing endpoints. This vulnerability requires no admin privileges, no special permissions beyond basic control panel access, and bypasses all production hardening settings (allowAdminChanges: false, devMode: false, enableTwigSandbox: true). Users should update to the patched 5.9.9 or 4.17.4 release to mitigate the issue.
- Record
EUVD-2026-11257- CVSS 4.0
- 8.1 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-fp5j-j7j4-mcxc
CraftCMS has an RCE vulnerability via relational conditionals in the control panel
A Remote Code Execution vulnerability exists in the Craft CMS 5 conditions system.
The BaseElementSelectConditionRule::getElementIds() method passes user-controlled string input
through renderObjectTemplate() -- an unsandboxed Twig rendering function with escaping disabled.
Any authenticated Control Panel user (including non-admin roles such as Author or Editor) can achieve full RCE by sending a crafted condition rule via standard element listing endpoints.
This vulnerability requires no admin privileges, no special permissions beyond basic control panel access, and bypasses all production hardening settings (allowAdminChanges: false, devMode: false, enableTwigSandbox: true).
Users should update to the patched 5.99 release to mitigate the issue.
- Record
GHSA-fp5j-j7j4-mcxc- CVSS 4.0
- 8.1 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U - Weakness
- CWE-94
- Updated
- 2026-11-02
NVD
Craft is a content management system (CMS). Prior to 5.9.9 and 4.17.4, a Remote Code Execution vulnerability exists in the Craft CMS 5 conditions system. The BaseElementSelectConditionRule::getElementIds() method passes user-controlled string input through renderObjectTemplate() -- an unsandboxed Twig rendering function with escaping disabled. Any authenticated Control Panel user (including non-admin roles such as Author or Editor) can achieve full RCE by sending a crafted condition rule via standard element listing endpoints. This vulnerability requires no admin privileges, no special permissions beyond basic control panel access, and bypasses all production hardening settings (allowAdminChanges: false, devMode: false, enableTwigSandbox: true). Users should update to the patched 5.9.9 or 4.17.4 release to mitigate the issue.
- Record
CVE-2026-31857- CVSS 4.0
- 8.1 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/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
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-94
- Updated
- 2026-11-02
OSV
CraftCMS has an RCE vulnerability via relational conditionals in the control panel
Craft is a content management system (CMS). Prior to 5.9.9 and 4.17.4, a Remote Code Execution vulnerability exists in the Craft CMS 5 conditions system. The BaseElementSelectConditionRule::getElementIds() method passes user-controlled string input through renderObjectTemplate() -- an unsandboxed Twig rendering function with escaping disabled. Any authenticated Control Panel user (including non-admin roles such as Author or Editor) can achieve full RCE by sending a crafted condition rule via standard element listing endpoints. This vulnerability requires no admin privileges, no special permissions beyond basic control panel access, and bypasses all production hardening settings (allowAdminChanges: false, devMode: false, enableTwigSandbox: true). Users should update to the patched 5.9.9 or 4.17.4 release to mitigate the issue.
- Record
CVE-2026-31857- CVSS 4.0
- 8.1 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U - Weakness
- CWE-94
- Updated
- 2026-11-02
OSVGHSA-fp5j-j7j4-mcxc
CraftCMS has an RCE vulnerability via relational conditionals in the control panel
A Remote Code Execution vulnerability exists in the Craft CMS 5 conditions system.
The BaseElementSelectConditionRule::getElementIds() method passes user-controlled string input
through renderObjectTemplate() -- an unsandboxed Twig rendering function with escaping disabled.
Any authenticated Control Panel user (including non-admin roles such as Author or Editor) can achieve full RCE by sending a crafted condition rule via standard element listing endpoints.
This vulnerability requires no admin privileges, no special permissions beyond basic control panel access, and bypasses all production hardening settings (allowAdminChanges: false, devMode: false, enableTwigSandbox: true).
Users should update to the patched 5.99 release to mitigate the issue.
- Record
GHSA-fp5j-j7j4-mcxc- CVSS 4.0
- 8.1 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U - Weakness
- CWE-94
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
craftcms/cmsPackagist |
5.0.0-RC1 to 5.9.8 | 5.9.9 |
craftcms/cmsPackagist |
4.0.0-beta.1 to 4.17.3 | 4.17.4 |
craftcms/cmsPackagist |
5.0.0-RC1 up to 5.9.9, plus listed versions 5.0.05.0.15.0.25.0.35.0.4 Show 45 moreShow less5.0.55.0.65.1.05.1.15.1.105.1.25.1.35.1.45.1.55.1.65.1.75.1.85.1.95.2.05.2.0-beta.15.2.0-beta.25.2.0-beta.35.2.0-beta.45.2.0-beta.55.2.0-beta.65.2.15.2.105.2.25.2.35.2.45.2.4.15.2.55.2.65.2.75.2.85.2.95.3.05.3.0-beta.15.3.0-beta.25.3.0.15.3.0.25.3.0.35.3.15.3.25.3.35.3.45.3.55.3.65.4.05.4.0.1 |
5.9.9 |
craftcms/cmsPackagist |
4.0.0-beta.1 up to 4.17.4, plus listed versions 4.0.04.0.0-RC14.0.0-RC24.0.0-RC34.0.0-beta.2 Show 45 moreShow less4.0.0-beta.34.0.0-beta.44.0.0.14.0.14.0.24.0.34.0.44.0.54.0.5.14.0.5.24.0.64.1.04.1.0.14.1.0.24.1.14.1.24.1.34.1.44.1.4.14.10.04.10.0-beta.14.10.0-beta.24.10.14.10.24.10.34.10.44.10.54.10.64.10.74.10.84.11.04.11.0.14.11.0.24.11.14.11.24.11.34.11.44.11.54.12.04.12.14.12.24.12.34.12.44.12.4.14.12.5 |
4.17.4 |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | 0Asylum/CVE-2026-31857 | 2026-09-30 |
| PoC in GitHub | 0xTatsuki/CVE-2026-31857 | 2026-09-29 |
| PoC in GitHub | TRX-0/CVE-2026-31857-craftcms-ssti | 2026-08-24 |
| PoC in GitHub | WhiteMachin3/CVE-2026-31857 | 2026-10-05 |
| PoC in GitHub | kaizoku73/CVE-2026-31857-PoC | 2026-10-08 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-31857 is a high vulnerability (CVSS 8.1) in Craftcms Cms, published March 11, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.92%, the 60th percentile. Fixed in craftcms/cms 5.9.9.
References
github.com/craftcms/cms/security/advisories/GHSA-fp5j-j7j4-mcxc
nvd.nist.gov/vuln/detail/CVE-2026-31857
Left out here: 293 versions. The JSON record has them.