Auth bypass in Pagekit
CVE-2026-57518
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (50.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Pagekit — versions 0
Weakness classification (CWE)
References
- gist.github.com/sermikr0/6f0a67e9d101746fcdb04827de137847 (technical-description, exploit)
- www.vulncheck.com/advisories/pagekit-cms-privilege-escalation-via-userapicontro… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-57518?
- CVE-2026-57518 is a high-severity vulnerability in Pagekit, classified under Missing Authorization. CVSS score: 8.8/10. Published 2026-06-26.
- How severe is CVE-2026-57518?
- High severity. CVSS v3 base score is 8.8 out of 10.