CVE-2021-24980: Gwolle Guestbook < 4.2.0 - Reflected Cross-Site Scripting

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-12-27 · updated 2026-06-17
Weakness: CWE-79

Description

The Gwolle Guestbook WordPress plugin before 4.2.0 does not sanitise and escape the gwolle_gb_user_email parameter before outputting it back in an attribute, leading to a Reflected Cross-Site Scripting issue in an admin page

Affected products

Gwolle Guestbook Plugin: before 4.2.0 — fixed in 4.2.0

How to fix

Upgrade to a fixed version: Gwolle Guestbook Plugin 4.2.0. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/e50bcb39-9a01-433f-81b3-fd4018672b85
https://wpscan.com/vulnerability/e50bcb39-9a01-433f-81b3-fd4018672b85

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