WordPress Countdown & Clock plugin <= 2.3.2 - Reflected Cross-Site Scripting (XSS) vulnerability

published 2022-05-06 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-33759

cvss: 4.7; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits: 0; none known

Reflected Cross-Site Scripting (XSS) vulnerability in Adam Skaat's Countdown & Clock plugin on WordPress via &ycd_type vulnerable parameter.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 20 mo ago (2025-02-20)

Exploit prediction

0.76% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.7	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

Adam Skaat Countdown & Clock (WordPress plugin)

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

Technology feeds

WordPress rss critical rss

References

wordpress.org /plugins/countdown-builder/
product, third-party-advisory
patchstack.com /database/vulnerability/countdown-builder/wordpress-countdown-clock-plugin-2-3-0-stored-cross-site-scripting-x
third-party-advisory

Sources

CVE List CVE-2022-29421
NVD CVE-2022-29421

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary