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Vulnerability details: VCID-8rkv-wfha-n7hb
Vulnerability ID VCID-8rkv-wfha-n7hb
Aliases CVE-2026-31857
GHSA-fp5j-j7j4-mcxc
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-94 Improper Control of Generation of Code ('Code Injection')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00138 https://api.first.org/data/v1/epss?cve=CVE-2026-31857
epss 0.00138 https://api.first.org/data/v1/epss?cve=CVE-2026-31857
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-fp5j-j7j4-mcxc
cvssv4 8.1 https://github.com/craftcms/cms
generic_textual HIGH https://github.com/craftcms/cms
cvssv4 8.1 https://github.com/craftcms/cms/commit/8d4903647dcfd31b8d40ed027e27082013347a80
generic_textual HIGH https://github.com/craftcms/cms/commit/8d4903647dcfd31b8d40ed027e27082013347a80
ssvc Track https://github.com/craftcms/cms/commit/8d4903647dcfd31b8d40ed027e27082013347a80
cvssv3.1_qr HIGH https://github.com/craftcms/cms/security/advisories/GHSA-fp5j-j7j4-mcxc
cvssv4 8.1 https://github.com/craftcms/cms/security/advisories/GHSA-fp5j-j7j4-mcxc
generic_textual HIGH https://github.com/craftcms/cms/security/advisories/GHSA-fp5j-j7j4-mcxc
ssvc Track https://github.com/craftcms/cms/security/advisories/GHSA-fp5j-j7j4-mcxc
cvssv4 8.1 https://nvd.nist.gov/vuln/detail/CVE-2026-31857
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2026-31857
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-31857
8d4903647dcfd31b8d40ed027e27082013347a80 https://github.com/craftcms/cms/commit/8d4903647dcfd31b8d40ed027e27082013347a80
CVE-2026-31857 https://nvd.nist.gov/vuln/detail/CVE-2026-31857
GHSA-fp5j-j7j4-mcxc https://github.com/advisories/GHSA-fp5j-j7j4-mcxc
GHSA-fp5j-j7j4-mcxc https://github.com/craftcms/cms/security/advisories/GHSA-fp5j-j7j4-mcxc
No exploits are available.
Vector: 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 Found at https://github.com/craftcms/cms
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: 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 Found at https://github.com/craftcms/cms/commit/8d4903647dcfd31b8d40ed027e27082013347a80
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

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none

present

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passive

active

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Vector: SSVCv2/E:N/A:Y/T:T/P:M/B:A/M:M/D:T/2026-03-12T14:02:18Z/ Found at https://github.com/craftcms/cms/commit/8d4903647dcfd31b8d40ed027e27082013347a80
Vector: 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 Found at https://github.com/craftcms/cms/security/advisories/GHSA-fp5j-j7j4-mcxc
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

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passive

active

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Vector: SSVCv2/E:N/A:Y/T:T/P:M/B:A/M:M/D:T/2026-03-12T14:02:18Z/ Found at https://github.com/craftcms/cms/security/advisories/GHSA-fp5j-j7j4-mcxc
Vector: 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 Found at https://nvd.nist.gov/vuln/detail/CVE-2026-31857
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

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none

passive

active

high

low

none

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low

none

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none

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low

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Exploit Prediction Scoring System (EPSS)
Percentile 0.33522
EPSS Score 0.00138
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:44:47.640613+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/31xxx/CVE-2026-31857.json 38.6.0