What is CVE-2021-24980?

CVE-2021-24980 is a medium-severity vulnerability in Gwolle Guestbook Project, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-12-27.

How severe is CVE-2021-24980?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2021-24980 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Gwolle Guestbook Project

CVE-2021-24980

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

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-12-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (55.0th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Gwolle Guestbook Project
Gwolle Guestbook — versions 4.2.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

20142995/nuclei-templates

References

wpscan.com/vulnerability/e50bcb39-9a01-433f-81b3-fd4018672b85 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-24980?: CVE-2021-24980 is a medium-severity vulnerability in Gwolle Guestbook Project, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-12-27.
How severe is CVE-2021-24980?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-24980 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.