CVE-2026-109322
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk9th percentile - higher than 9% of all known CVEs
Summary
Grav Guestbook plugin before 0.5.2 contains a stored cross-site scripting vulnerability because its AJAX Load more and Admin Load all handlers insert stored author and message fields into the DOM as unescaped HTML via jQuery. Unauthenticated visitors can submit markup that executes in other visitors' browsers and, in versions 0.5.0 and 0.5.1, in administrator moderation sessions.
Risk Assessment
The risk includes execution of malicious script in users' and administrators' browsers, potentially leading to session theft, malware distribution, or account takeover.
Recommendation
Update the Grav Guestbook plugin to version 0.5.2 or later, which includes a fix for this vulnerability.
Other vulnerabilities in Grav Guestbook
Original NVD description (English source)
Grav Guestbook plugin before 0.5.2 contains a stored cross-site scripting vulnerability because its AJAX Load more and Admin Load all handlers insert stored author and message fields into the DOM as unescaped HTML via jQuery. Unauthenticated visitors can submit markup that executes in other visitors' browsers and, in versions 0.5.0 and 0.5.1, in administrator moderation sessions.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS