What is CVE-2021-24561?

CVE-2021-24561 is a medium-severity vulnerability in Veronalabs Wp Sms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-08-23.

How severe is CVE-2021-24561?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Is CVE-2021-24561 known to be exploited?

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

XSS in Veronalabs Wp Sms

CVE-2021-24561

The WP SMS WordPress plugin before 5.4.13 does not sanitise the "wp_group_name" parameter before outputting it back in the "Groups" page, leading to an Authenticated Stored Cross-Site Scripting issue

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-08-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (50.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Veronalabs Wp Sms
Wp Sms — versions 5.4.13

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

wpscan.com/vulnerability/5433ef4c-4451-4b6e-992b-69c5eccabf90 (Exploit, Third Party Advisory)
plugins.trac.wordpress.org/changeset/2570762/wp-sms (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2021-24561?: CVE-2021-24561 is a medium-severity vulnerability in Veronalabs Wp Sms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-08-23.
How severe is CVE-2021-24561?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2021-24561 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.