CVE-2021-36910: Authenticated (admin user role) Stored Cross-Site Scripting (XSS) in WP-Appbox (WordPress plugin) <= 4.3.20.

Q: How do I fix CVE-2021-36910?

wp-appbox: upgrade to newer than 4.3.20. Exact commands for each OS are on this page.

Q: Is CVE-2021-36910 being exploited?

CVE-2021-36910 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-2021-36910 affect?

CVE-2021-36910 affects wp-appbox. Severity is low (CVSS 3.4). Authenticated (admin user role) Stored Cross-Site Scripting (XSS) in WP-Appbox (WordPress plugin) <= 4.3.20.

Q: How urgent is CVE-2021-36910?

Priority 24/100. No elevated risk signals yet.

Routine

LOW 3.4UPGRADE

CVE-2021-36910 is a low-severity flaw (CVSS 3.4) affecting wp-appbox. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Authenticated (admin user role) Stored Cross-Site Scripting (XSS) in WP-Appbox (WordPress plugin) <= 4.3.20.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.4 (Low)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-04-11
Last modified	2026-06-17

Publisher (CNA): Patchstack · Vendor: wp-appbox project

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

Am I affected?

Timeline

2022-04-11 20:15 UTCPublished CVE record published
2026-06-17 03:59 UTCUpdated Record last modified

wp-appbox project wp-appbox UPGRADE

Affected: <= 4.3.20

Fixed in: newer than 4.3.20

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy wp-appbox || rpm -q wp-appbox || wp-appbox --version

2. UPGRADE to newer than 4.3.20 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade wp-appbox

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade wp-appbox

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-2021-36910?

wp-appbox: upgrade to newer than 4.3.20. Exact commands for each OS are on this page.

Is CVE-2021-36910 being exploited?

CVE-2021-36910 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-2021-36910 affect?

CVE-2021-36910 affects wp-appbox. Severity is low (CVSS 3.4). Authenticated (admin user role) Stored Cross-Site Scripting (XSS) in WP-Appbox (WordPress plugin) <= 4.3.20.

How urgent is CVE-2021-36910?

Priority 24/100. No elevated risk signals yet.

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2025-1489 MEDIUM 6.4 UPGRADE The WP-Appbox plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's appbox shortc

References

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