CVE-2021-24980: The Gwolle Guestbook WordPress plugin before 4.2.0 does not sanitise and escape the gwolle_gb_user_email param

Q: How do I fix CVE-2021-24980?

gwolle guestbook: upgrade to 4.2.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-24980 being exploited?

CVE-2021-24980 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-24980 affect?

CVE-2021-24980 affects gwolle guestbook. Severity is medium (CVSS 6.1). 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

Q: How urgent is CVE-2021-24980?

Priority 41/100. Public exploit reference

This month

MEDIUM 6.1UPGRADE

CVE-2021-24980 is a medium-severity flaw (CVSS 6.1) affecting gwolle guestbook. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-12-27
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: gwolle guestbook project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-12-27 11:15 UTCPublished CVE record published
2026-06-17 03:41 UTCUpdated Record last modified

gwolle guestbook project gwolle guestbook UPGRADE

Affected: < 4.2.0

Fixed in: 4.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy gwolle-guestbook || rpm -q gwolle-guestbook || gwolle-guestbook --version

2. UPGRADE to 4.2.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade gwolle-guestbook

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade gwolle-guestbook

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-24980?

gwolle guestbook: upgrade to 4.2.0. Exact commands for each OS are on this page.

Is CVE-2021-24980 being exploited?

CVE-2021-24980 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-24980 affect?

CVE-2021-24980 affects gwolle guestbook. Severity is medium (CVSS 6.1). 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

How urgent is CVE-2021-24980?

Priority 41/100. Public exploit reference

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2017-20089 LOW 3.5 DOWNGRADE A vulnerability was found in Gwolle Guestbook Plugin 1.7.4

References

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