# CVE-2026-109319: Grav Guestbook plugin missing authorization and CSRF in moderation

Source: https://junglewise.ai/threats/cve-2026-109319-grav-guestbook-plugin-0-5-0-and-0-5-1-contains-missing  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-12. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-109319 · Severity: medium · CVSS 4.3 · Published 2026-10-12

Grav's Guestbook plugin, a tool for managing user comments and feedback on websites, has authorization and security flaws in its moderation features. Attackers with limited admin access can delete or approve guestbook entries they shouldn't, and external sites can trick authorized moderators into performing unwanted actions through their browsers.

Vendors: [Grav](https://junglewise.ai/threats/vendors/grav).

## Quick answers

**Is CVE-2026-109319 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-109319 being exploited in the wild.

**How severe is CVE-2026-109319?** Medium severity, with a CVSS score of 4.3, published 12 October 2026.

**Which products and versions are affected?** Grav Guestbook plugin 0.5.0, 0.5.1.

**Is there a fix for CVE-2026-109319?** Yes: fixed in 0.5.2. Until then: Restrict admin access to users who require guestbook moderation permissions until the update is applied. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-109319 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-109319?** Check whether you run Grav Guestbook plugin at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 0.5.2

Restrict admin access to users who require guestbook moderation permissions until the update is applied.

## Technical details

The Guestbook plugin's admin moderation actions (delete, approve, approveAll) read route parameters and execute mutations without checking the admin.guestbook permission or a CSRF nonce. An authenticated admin user without the guestbook permission can directly mutate guestbook data; additionally, external sites can induce state-changing GET requests from a moderator's browser when their session cookie is included, bypassing CSRF protections.

## Affected products

- Grav Guestbook plugin 0.5.0, 0.5.1

## Timeline

- 2026-09-23: disclosed
- 2026-10-12: advisory

## References

- [https://github.com/getgrav/grav/security/advisories/GHSA-wxr7-h5mm-c7mv](https://github.com/getgrav/grav/security/advisories/GHSA-wxr7-h5mm-c7mv)
- [https://www.vulncheck.com/advisories/grav-guestbook-plugin-0.5.0-and-0.5.1-missing-authorization-and-csrf-in-moderation](https://www.vulncheck.com/advisories/grav-guestbook-plugin-0.5.0-and-0.5.1-missing-authorization-and-csrf-in-moderation)

## Related threats

- [Grav Guestbook plugin stored cross-site scripting](https://junglewise.ai/threats/cve-2026-109322-grav-guestbook-plugin-before-0-5-2-contains-a-stored-cross-site)