Reflected cross-site scripting in Gwolle Guestbook WordPress plugin
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
The Gwolle Guestbook plugin for WordPress by mpol is affected in all versions up to and including 5.1.1. Insufficient input sanitization and output escaping of the 'permalink' parameter enables reflected cross-site scripting (CWE-79). An unauthenticated attacker can inject arbitrary web scripts into pages that run if a user is tricked into clicking a link.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Description from the CNA
The Gwolle Guestbook plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'permalink' parameter in all versions up to, and including, 5.1.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
Why it matters now
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
Remediation
The sources list no fixed version for Gwolle Guestbook.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Timeline
- 2026-10-16 Threatist record created from CVE-2026-103481
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-16 Priority changed: MEDIUM → LOW
- 2026-10-16 Alias added: GHSA-qrw4-gph9-8mh4
References
Other 5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/d8eff266-43fe-4636-b4ef-c973db7e7952?source=cve
- https://plugins.trac.wordpress.org/browser/gwolle-gb/tags/5.1.1/frontend/gb-permalink.php#L28
- https://plugins.trac.wordpress.org/browser/gwolle-gb/tags/5.1.1/frontend/gb-permalink.php#L21
- https://plugins.trac.wordpress.org/browser/gwolle-gb/tags/5.1.1/frontend/gb-ajax-infinite-scroll.php#L96
- https://codeberg.org/cyclotouriste/gwolle-gb/commit/f6e483654b56188a3fa208fd18a4f0468577a825
More mpol vulnerabilities
- TI-2024-10608 Chessgame Shizzle <= 1.3.0 - Reflected Cross-Site Scripting CVSS 3.1MEDIUM 6.1
- TI-2025-05237 Gwolle Guestbook <= 4.9.2 - Unauthenticated Stored Cross-Site Scripting via `gwolle_gb_content` Parameter CVSS 3.1MEDIUM 6.1
- TI-2026-86561 Stored DOM-based cross-site scripting in WP ImageViewer plugin CVSS 3.1MEDIUM 6.4
Sources
- CVE-2026-103481 · CVE Program
- CVE-2026-103481 · NVD
- FIRST EPSS
- GHSA-qrw4-gph9-8mh4 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences