What is CVE-2021-24232?

CVE-2021-24232 is a medium-severity vulnerability in Elbtide Advanced Booking Calendar, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-04-22.

How severe is CVE-2021-24232?

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

Is CVE-2021-24232 known to be exploited?

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

XSS in Elbtide Advanced Booking Calendar

CVE-2021-24232

The Advanced Booking Calendar WordPress plugin before 1.6.8 does not sanitise the license error message when output in the settings page, leading to an authenticated reflected Cross-Site Scripting issue

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-04-22 · 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: 0.006 (47.8th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Elbtide Advanced Booking Calendar
Advanced Booking Calendar — versions 1.6.8

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

20142995/nuclei-templates

References

wpscan.com/vulnerability/f06629b5-8b15-48eb-a7a7-78b693e06b71 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-24232?: CVE-2021-24232 is a medium-severity vulnerability in Elbtide Advanced Booking Calendar, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-04-22.
How severe is CVE-2021-24232?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2021-24232 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.