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TI-2026-76616 Aliases CVE-2026-112777GHSA-f7pv-pv9r-vg93

Craft CMS Twig create() blocklist bypass allows remote code execution

Priority MEDIUM 45CWE-184Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Craft CMS 4.x from 4.0.0 before 4.18.8 and 5.x from 5.0.0 before 5.11.0 contains a blocklist bypass in the Twig create() function (CWE-184). Its class-name checks are case-sensitive while PHP class resolution is not. An attacker with template-execution rights, such as a Control Panel administrator, can read .env secrets or write a PHP file into the webroot to execute code remotely.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Craft CMS 4.x before 4.18.8 and 5.x before 5.11.0 contains a blocklist bypass in the Twig create() function because its class-name checks are case-sensitive while PHP class resolution is not. Attackers with template-execution rights, such as Control Panel administrators, can instantiate SplFileObject via a lowercase class name to read .env secrets or write a PHP file into the webroot for remote code execution.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00612 49th percentileScored 2026-11-07
Fix Fixed cms (craftcms): 4.18.8, 5.11.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Craft CMScms4.0.0 to before 4.18.84.18.8Patch availableCNA
Craft CMScms5.0.0 to before 5.11.05.11.0Patch availableCNA
  • cms VendorCraft CMS Affected 4.0.0 to before 4.18.8 Fixed in 4.18.8 Patch available CNA
  • cms VendorCraft CMS Affected 5.0.0 to before 5.11.0 Fixed in 5.11.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*——Craft CMS
  • cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:* Versions — — ·Craft CMS

Remediation

Upgrade Craft CMS 4.x to 4.18.8 and Craft CMS 5.x to 5.11.0.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA cms (craftcms) Fixed in 4.18.8
  • Fix · CNA cms (craftcms) Fixed in 5.11.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    craftcms cms 5.11.0

    8 records Highest priority Priority MEDIUM 7 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-76615 Craft CMS GraphQL Site-Scope Bypass via MutationsPriority MEDIUM 48
    • TI-2026-76614 Verification code reuse in Craft CMS allows account takeoverPriority MEDIUM 44
    • TI-2026-76613 Craft CMS ContentBlock field layout code injection enables RCEPriority MEDIUM 41
    Show all 8 records →
  • Release ·

    craftcms cms 4.18.8

    3 records Highest priority Priority MEDIUM 2 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-76609 Code injection in Craft CMS Twig group filter allows remote code executionPriority MEDIUM 41
    • TI-2026-76610 Twig sandbox allowlist bypass in Craft CMS exposes secretsPriority LOW 31
    Show all 3 records →

Timeline

  1. 2026-10-20 Threatist record created from CVE-2026-112777
  2. 2026-10-20 Alias added: GHSA-f7pv-pv9r-vg93
  3. 2026-10-20 CISA SSVC decision points changed

References

Advisory 1

  • TI-2025-23503 Craft CMS Allows Remote Code Execution KEVCVSS 3.1CRITICAL 10.0
  • TI-2024-37138 RCE when PHP `register_argc_argv` config setting is enabled in craftcms/cms KEVCVSS 4.0CRITICAL 9.3
  • TI-2025-16994 Potential RCE with a compromised security key in craft/cms KEVCVSS 3.1HIGH 8.1
  • TI-2025-24595 Craft CMS stores user-provided content in session files KEVCVSS 4.0MEDIUM 6.9
  • TI-2023-22284 Craft CMS Remote Code Execution vulnerability CVSS 3.1CRITICAL 10.0
  • TI-2024-25171 Craft CMS up to v3.7.31 was discovered to contain a SQL injection vulnerability via the GraphQL API endpoint. CVSS 3.1CRITICAL 9.8
See all 203 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences