Craft CMS: Authorization bypass in GraphQL mutations allows cross-site content changes
Summary
Craft CMS from 5.0.0 before 5.11.0 does not enforce GraphQL token site scope on entry creation and on delete mutations for categories, tags and assets. An attacker holding a GraphQL token scoped to one site can create entries in another site and delete shared content. The attacker must first obtain a valid site-scoped token, and the impact is limited to multi-site installations.
Affected
- Craft CMS 5.0.0 up to but not including 5.11.0
- Multi-site installations with GraphQL tokens are the relevant case
- Single-site installations are probably not affected by the cross-site part (not verified)
Fixed in
- Craft CMS 5.11.0 or later
- Note: GHSA-3wcr-p33w-528f (fixed in 5.10.11) covers the entry save and delete mutations. Unknown whether 5.10.11 covers the full scope of this CVE; use 5.11.0 as the target.
Workaround
- No vendor workaround known. Upgrading to 5.11.0 or later is the remedy.
- Review and revoke unused or over-scoped GraphQL tokens (not confirmed as an official mitigation).
- Review entry create, modify and delete events for writes outside a token's intended site scope (secondary source, not confirmed for this CVE).
Exploitation
- Known exploited (CISA KEV): No
- Public proof of concept: None found; VulDB states no exploit exists. A full search of exploit repositories was not performed.
- CISA SSVC: Exploitation none, automatable yes, technical impact total.
Our recommendation
- Check whether Craft CMS is used in a multi-site setup with GraphQL tokens.
- Update Craft CMS to 5.11.0 or later; verify the current release list before choosing a target.
- Review and restrict GraphQL tokens to the sites they need, and rotate tokens that may be over-scoped.
- Monitor entry creation and deletion events for writes outside a token's site scope.
- Prioritise internet-facing sites with shared multi-site content.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- GitHub Security Advisory GHSA-7rr3-4jcm-x526 github.com
- VulnCheck Advisory www.vulncheck.com
- OSV CVE-2026-112776 osv.dev
- VulDB 422527 vuldb.com
- Craft CMS 5.11.0 release notes newreleases.io
- GHSA-3wcr-p33w-528f (related advisory) github.com
- ACN CSIRT Italia advisory on Craft CMS www.acn.gov.it
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 01:14.
Original description (NVD)
Craft CMS from 5.0.0 before 5.11.0 contains an authorization bypass vulnerability that allows site-scoped GraphQL tokens to mutate other sites' content because requireAllowedSite() is not enforced. Attackers holding a site-A token can create entries in site B via supplied siteId and delete entries, categories, tags, and assets shared across sites.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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