Auth bypass in Getgrav Grav-Plugin-Guestbook
CVE-2026-109319
Grav Guestbook plugin 0.5.0 and 0.5.1 contains missing authorization and cross-site request forgery vulnerabilities in Admin moderation actions delete, approve, and approveAll. Authenticated Admin users lacking the admin.guestbook permission, or external sites abusing a moderator's session via nonce-less GET requests, can delete or approve Guestbook entries.
Vulnerability class: Broken Access Control
Published .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/getgrav/grav/security/advisories/GHSA-wxr7-h5mm-c7mv (vendor-advisory, third-party-advisory)
- www.vulncheck.com/advisories/grav-guestbook-plugin-0.5.0-and-0.5.1-missing-auth… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109319?
- CVE-2026-109319 is a medium-severity vulnerability in Getgrav Grav-Plugin-Guestbook, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-10-12.
- How severe is CVE-2026-109319?
- Medium severity. CVSS v3 base score is 4.3 out of 10.