Quick answers
- Is CVE-2026-109322 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-109322 being exploited in the wild.
- How severe is CVE-2026-109322?
- Medium severity, with a CVSS score of 6.1, published 12 October 2026.
- Which products and versions are affected?
- Grav Guestbook plugin before 0.5.2.
- Is there a fix for CVE-2026-109322?
- Yes: fixed in 0.5.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-109322 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-109322?
- 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
Technical details
The vulnerability is a stored cross-site scripting (XSS) flaw in the Guestbook plugin's AJAX Load more and Admin Load all handlers, which concatenate visitor-supplied author and message fields into HTML strings and insert them into the DOM via jQuery without proper escaping. While initial server-rendered entries use Twig escaping, the AJAX paths do not, allowing unauthenticated attackers to inject markup that executes in other visitors' browsers; in versions 0.5.0–0.5.1, the automatic loading of all records in the Admin moderation view means the payload also executes in authenticated administrator sessions. The fix is available in version 0.5.2, which inserts visitor fields as text rather than parsed HTML.
Affected products
- Grav Guestbook plugin before 0.5.2
Timeline
- 2026-09-23: disclosed
- 2026-10-12: advisory