CVE-2025-5807

Gwolle Guestbook <= 4.9.2 - Unauthenticated Stored Cross-Site Scripting via `gwolle_gb_content` Parameter

Published Jul 10, 2025 CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed

Description

The Gwolle Guestbook plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘gwolle_gb_content’ parameter in all versions up to, and including, 4.9.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Analysis

Technical impact

The Gwolle Guestbook plugin for WordPress contains a stored cross‑site scripting flaw in the gwolle_gb_content parameter. Because the input is stored without proper sanitisation or escaping, content that includes malicious JavaScript can be saved and later rendered within guestbook entries. When a user views a page that contains the injected content, the browser executes the stored script.

Affected Systems

The vulnerability affects all versions of the Gwolle Guestbook plugin up to and including 4.9.2 on WordPress sites.

Risk and Exploitability

The CVSS score of 6.1 indicates a moderate level of severity. The EPSS score of less than 1% suggests a low likelihood of exploitation in the wild, and the flaw is not listed in CISA’s KEV catalog. Based on the description, it is inferred that an attacker can inject the malicious script via the gwolle_gb_content field in an unauthenticated form submission, which then persists and is served to subsequent visitors.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

mpol

Gwolle Guestbook

unaffected

Version	Status	Constraints
`0`	affected	≤ 4.9.2

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade the Gwolle Guestbook plugin to version 4.9.3 or newer, which resolves the stored XSS issue.
If an upgrade is not possible immediately, restrict the guestbook entry form to authenticated users only, preventing unauthenticated content submission.
Implement input validation or a web application firewall that strips or escapes <script> tags from gwolle_gb_content submissions.

Generated by OpenCVE AI on April 22, 2026 at 01:07 UTC.

Tracking

Advisories

Source	ID	Title
EUVD	EUVD-2025-20882	The Gwolle Guestbook plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘gwolle_gb_content’ parameter in all versions up to, and including, 4.9.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.236% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://plugins.trac.wordpress.org/changeset/3316455/
https://www.wordfence.com/threat-intel/vulnerabilities/id/956f86c5-05af-41c3-a779-5b25f62122dd?source=cve

History

Jul 16, 2025 1:45 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics	epss `{'score': 0.00074}`	epss `{'score': 0.0008}`

Jul 11, 2025 1:45 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics	epss `{'score': 0.00055}`	epss `{'score': 0.00074}`

Jul 10, 2025 2:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Jul 10, 2025 2:00 AM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		The Gwolle Guestbook plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘gwolle_gb_content’ parameter in all versions up to, and including, 4.9.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Title		Gwolle Guestbook <= 4.9.2 - Unauthenticated Stored Cross-Site Scripting via `gwolle_gb_content` Parameter
Weaknesses		CWE-79
References		https://plugins.trac.wordpress.org/changeset/3316455/ https://www.wordfence.com/threat-intel/vulnerabilities/id/956f86c5-05af-41c3-a779-5b25f62122dd?source=cve
Metrics		cvssV3_1 `{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}`