Read the docs
TI-2026-40278 Aliases CVE-2026-55792GHSA-287w-mxq6-x2cp

Craft CMS: Sensitive File Disclosure / Server-Side File Read

Priority MEDIUM 62CWE-200Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-200.

Summary

Craft CMS is a content management system (CMS). In versions starting from 4.0.0-RC1 and prior to 4.18.0, and 5.0.0-RC1 and above, prior to 5.10.0, the dataUrl() Twig function is included in Craft’s Twig sandbox allowlist, allowing any control panel user granted the utility:system-messages permission to embed a file-reading payload into system email templates. When those emails are sent, the server reads the target file and returns its contents as a base64-encoded data URL embedded in the email body. The .env file, which typically contains the database password, CRAFT_SECURITY_KEY, and third-party API keys, passes all of Craft’s existing dataUrl() protection checks and is fully exfiltrated. Obtaining CRAFT_SECURITY_KEY enables an attacker to forge session tokens and escalate to full admin account takeover. This issue has been fixed in versions 4.18.0 and 5.10.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00333 26th percentileScored 2026-11-07
Fix Fixed cms (craftcms): 4.18.0, 5.10.0craftcms/cms (Packagist): 4.18.0, 5.10.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

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-RC1 to before 4.18.0; 5.0.0-RC1 to before 5.10.04.18.0, 5.10.0Patch availableCNA
—craftcms/cms (Packagist)4.0.0-RC1 to before 4.18.04.18.0Patch availableGHSA-287w-mxq6-x2cp
—craftcms/cms (Packagist)5.0.0-RC1 to before 5.10.05.10.0Patch availableGHSA-287w-mxq6-x2cp
  • cms VendorCraft CMS Affected 4.0.0-RC1 to before 4.18.0; 5.0.0-RC1 to before 5.10.0 Fixed in 4.18.0, 5.10.0 Patch available CNA
  • craftcms/cms (Packagist) Vendor— Affected 4.0.0-RC1 to before 4.18.0 Fixed in 4.18.0 Patch available GHSA-287w-mxq6-x2cp
  • craftcms/cms (Packagist) Vendor— Affected 5.0.0-RC1 to before 5.10.0 Fixed in 5.10.0 Patch available GHSA-287w-mxq6-x2cp

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

  • Fix · CNA cms (craftcms) Fixed in 4.18.0, 5.10.0
  • Fix · GHSA-287w-mxq6-x2cp craftcms/cms (Packagist) Fixed in 4.18.0 Advisory →
  • Fix · GHSA-287w-mxq6-x2cp craftcms/cms (Packagist) Fixed in 5.10.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55792
  2. 2026-10-03 Alias added: GHSA-287w-mxq6-x2cp

References

Advisory 1

Other 3

  • 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