CVE-2026-109319

4.3Medium

Published 12 Oct 2026 · NVD status: Deferred · AI triage by gemini-3.8-flash

4.3Medium

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None
Impact: Limited impact
Weakness: CWE-862

Impact

Authenticated admin users without guestbook permissions or external attackers via CSRF can delete or approve guestbook entries. An attacker needs a low-privileged admin account or must trick an authenticated moderator into loading a malicious URL.

Root cause

Guestbook moderation actions (delete, approve, approveAll) lack authorization checks and allow state-changing operations via nonce-less GET requests.

Affected systems

Grav Guestbook plugin 0.5.0 and 0.5.1

CVSS v3.1 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Fix & remediation

Upgrade the Grav Guestbook plugin beyond version 0.5.1 once a patched release is available, or disable the Guestbook plugin in the admin panel if patching must wait.

shell

$ bin/gpm uninstall guestbook

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

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.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-109319