CVE-2021-24671: The MX Time Zone Clocks WordPress plugin before 3.4.1 does not escape the time_zone attribute of the mxmtzc_ti

Q: How do I fix CVE-2021-24671?

mx time zone clocks: upgrade to 3.4.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-24671 being exploited?

CVE-2021-24671 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-2021-24671 affect?

CVE-2021-24671 affects mx time zone clocks. Severity is medium (CVSS 5.4). The MX Time Zone Clocks WordPress plugin before 3.4.1 does not escape the time_zone attribute of the mxmtzc_time_zone_clocks shortcode, allowing users with a role as low as Contributor to perform Stored Cross-Site Scripting attacks

Q: How urgent is CVE-2021-24671?

Priority 36/100. Public exploit reference

Routine

MEDIUM 5.4UPGRADE

CVE-2021-24671 is a medium-severity flaw (CVSS 5.4) affecting mx time zone clocks. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The MX Time Zone Clocks WordPress plugin before 3.4.1 does not escape the time_zone attribute of the mxmtzc_time_zone_clocks shortcode, allowing users with a role as low as Contributor to perform Stored Cross-Site Scripting attacks

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-09-27
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: mx time zone clocks project

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

Am I affected?

Timeline

2021-09-27 16:15 UTCPublished CVE record published
2026-06-17 03:40 UTCUpdated Record last modified

mx time zone clocks project mx time zone clocks UPGRADE

Affected: < 3.4.1

Fixed in: 3.4.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mx-time-zone-clocks || rpm -q mx-time-zone-clocks || mx-time-zone-clocks --version

2. UPGRADE to 3.4.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mx-time-zone-clocks

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mx-time-zone-clocks

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-2021-24671?

mx time zone clocks: upgrade to 3.4.1. Exact commands for each OS are on this page.

Is CVE-2021-24671 being exploited?

CVE-2021-24671 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-2021-24671 affect?

CVE-2021-24671 affects mx time zone clocks. Severity is medium (CVSS 5.4). The MX Time Zone Clocks WordPress plugin before 3.4.1 does not escape the time_zone attribute of the mxmtzc_time_zone_clocks shortcode, allowing users with a role as low as Contributor to perform Stored Cross-Site Scripting attacks

How urgent is CVE-2021-24671?

Priority 36/100. Public exploit reference

Software pages

WordPress vulnerabilities

References

← Back to latest CVEs