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.
Published: 2025-07-10
Score: 6.1 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Stored Cross‑Site Scripting
Action: Patch
AI Analysis

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.

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

Remediation

No vendor fix or workaround currently provided.

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

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Advisories
Source ID Title
EUVD 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.
History

Wed, 16 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00074}

 epss

{'score': 0.0008}

Fri, 11 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00055}

 epss

{'score': 0.00074}

Thu, 10 Jul 2025 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 10 Jul 2025 02:00:00 +0000

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
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'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: Wordfence

Published:

Updated: 2026-04-08T17:10:02.439Z

Reserved: 2025-06-06T14:25:54.658Z

Link: CVE-2025-5807

cve-icon Vulnrichment

Updated: 2025-07-10T13:12:04.716Z

cve-icon NVD

Status : Deferred

Published: 2025-07-10T02:15:26.230

Modified: 2026-06-17T09:48:47.470

Link: CVE-2025-5807

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-22T01:15:07Z

Weaknesses
  • CWE-79

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')