Read the docs
TI-2026-71135 Aliases CVE-2026-109319GHSA-6xrw-24fx-4qcf

Missing authorization and CSRF in Grav Guestbook moderation actions

Priority LOW 23CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

The Grav Guestbook plugin versions 0.5.0 and 0.5.1 lack authorization checks and CSRF protection on its Admin moderation actions delete, approve and approveAll. An authenticated Admin user without the admin.guestbook permission can delete or approve Guestbook entries, and an external site can trigger these actions through a moderator's session using nonce-less GET requests. The flaw is classified as CWE-862 (Missing Authorization). An attacker needs network access and low privileges, and no user interaction beyond the moderator's session being active.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00201 10th percentileScored 2026-11-07
Fix Fixed grav-plugin-guestbook (getgrav): 0.5.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
getgravgrav-plugin-guestbook0.5.0 to before 0.5.20.5.2Patch availableCNA
  • grav-plugin-guestbook Vendorgetgrav Affected 0.5.0 to before 0.5.2 Fixed in 0.5.2 Patch available CNA

Remediation

Update grav-plugin-guestbook to version 0.5.2, which fixes the issue for affected versions from 0.5.0 before 0.5.2.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA grav-plugin-guestbook (getgrav) Fixed in 0.5.2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    getgrav grav-plugin-guestbook 0.5.2

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-71138 Stored XSS in Grav Guestbook via AJAX pagination and admin viewsPriority LOW 23
    Show all 2 records →

Timeline

  1. 2026-10-12 Threatist record created from CVE-2026-109319
  2. 2026-10-12 Alias added: GHSA-6xrw-24fx-4qcf
  3. 2026-10-13 CISA SSVC decision points changed

References

Advisory 1

  • TI-2026-30893 Grav: Privilege Escalation via Missing Server-Side Validation of groups/access CVSS 3.1CRITICAL 9.4
  • TI-2025-28971 Cross Site Scripting vulnerability in grav v.1.7.48 and before allows an attacker to… CVSS 3.1CRITICAL 9.8
  • TI-2021-04523 Unauthenticated Arbitrary YAML Write/Update leads to Code Execution CVSS 3.1CRITICAL 9.8
  • TI-2026-50940 Grav CMS before 2.0.16 Origin Validation Bypass via Referer CVSS 4.0CRITICAL 9.3
  • TI-2026-46446 Grav before 2.0.7 Remote Code Execution via Blueprint dynamicData CVSS 4.0CRITICAL 9.3
  • TI-2021-22428 GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2) CVSS 4.0CRITICAL 9.3
See all 228 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences