Vulnerability · Published Aug 11, 2026 · Assigned by VulnCheck

CVE-2026-72779Craft CMS 5.0.0-RC1 before 5.10.6 Arbitrary File Read via SplFileObject

Medium 4.5

In plain English

A medium-severity security flaw in cms from craftcms. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.5Medium

Exploit odds (30 days)0.4%top 68.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Craft CMS 5.0.0-RC1 before 5.10.6 and 4.0.0-RC1 before 4.18.2 contain an arbitrary file read vulnerability. The create() Twig function restricts class instantiation using a 5-entry blocklist that does not include SplFileObject, allowing an authenticated administrator (with allowAdminChanges=true) to configure a malicious entry type title or URI format that instantiates SplFileObject in a non-sandboxed template context. When a user subsequently creates an entry in the affected section, arbitrary files on the server (such as .env containing the security key and database credentials) are read and rendered as entry titles.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	craftcms/cms	5.10.6	GHSA-957r-qf9p-67xw
Packagist	craftcms/cms	4.18.2	GHSA-957r-qf9p-67xw

Affected products (as reported)

Vendor	Product	Versions
craftcms	cms	5.0.0-RC1 – before 5.10.6
craftcms	cms	4.0.0-RC1 – before 4.18.2

Weakness: CWE-184 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N

References

GitHub Security Advisory (GHSA-957r-qf9p-67xw) vendor-advisory
VulnCheck Advisory: Craft CMS 5.0.0-RC1 before 5.10.6 Arbitrary File Read via SplFileObject third-party-advisory