CVE-2021-24423

UpdraftPlus < 1.16.59 - Admin+ Stored Cross-Site Scripting

4.8 Medium

The UpdraftPlus WordPress Backup Plugin WordPress plugin before 1.6.59 does not sanitise its updraft_service settings, allowing high privilege users to set malicious JavaScript payload in it and leading to a Stored Cross-Site Scripting issue

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: High
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

0.61%Unchanged since Jan 24, 2022

What each source reports

NVD Score used 4.8

Record: CVE-2021-24423
CVSS 3.1: 4.8 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 3.5 LowAV:N/AC:M/Au:S/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

CVE List No score

UpdraftPlus < 1.16.59 - Admin+ Stored Cross-Site Scripting

Record: CVE-2021-24423
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2021-11335 No score

Record: EUVD-2021-11335
Updated: 2026-11-03

GitHub AdvisoriesGHSA-4v9q-rjxq-3952 No score

The UpdraftPlus WordPress Backup Plugin WordPress plugin before 1.6.59 does not sanitise its...

Record: GHSA-4v9q-rjxq-3952
Weakness: CWE-79
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-24423 is a medium vulnerability (CVSS 4.8) in Unknown Updraftplus Wordpress Backup Plugin, published January 24, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.61%, the 49th percentile. No source names a fixed version.