CVE-2023-0873: The Kanban Boards for WordPress plugin before 2.5.21 does not sanitise and escape some of its settings, which

Q: How do I fix CVE-2023-0873?

kanban boards for wordpress: upgrade to 2.5.21. Exact commands for each OS are on this page.

Q: Is CVE-2023-0873 being exploited?

CVE-2023-0873 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-2023-0873 affect?

CVE-2023-0873 affects kanban boards for wordpress. Severity is medium (CVSS 4.8). The Kanban Boards for WordPress plugin before 2.5.21 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capabi

Q: How urgent is CVE-2023-0873?

Priority 33/100. Public exploit reference

Routine

MEDIUM 4.8UPGRADE

CVE-2023-0873 is a medium-severity flaw (CVSS 4.8) affecting kanban boards for wordpress. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Kanban Boards for WordPress plugin before 2.5.21 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup)

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.5% (top 54%)
CISA exploited list	No
Published	2023-06-27
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: kanbanwp

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

Am I affected?

Timeline

2023-06-27 14:15 UTCPublished CVE record published
2026-06-17 05:26 UTCUpdated Record last modified

kanbanwp kanban boards for wordpress UPGRADE

Affected: < 2.5.21

Fixed in: 2.5.21

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy kanban-boards-for-wordpress || rpm -q kanban-boards-for-wordpress || kanban-boards-for-wordpress --version

2. UPGRADE to 2.5.21 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade kanban-boards-for-wordpress

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kanban-boards-for-wordpress

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-2023-0873?

kanban boards for wordpress: upgrade to 2.5.21. Exact commands for each OS are on this page.

Is CVE-2023-0873 being exploited?

CVE-2023-0873 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-2023-0873 affect?

CVE-2023-0873 affects kanban boards for wordpress. Severity is medium (CVSS 4.8). The Kanban Boards for WordPress plugin before 2.5.21 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capabi

How urgent is CVE-2023-0873?

Priority 33/100. Public exploit reference

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2023-40606 CRITICAL 9.1 UPGRADE Improper Control of Generation of Code ('Code Injection') vulnerability in Kanban for WordPress Kanban Boards
CVE-2023-23884 MEDIUM 5.9 UPGRADE Auth

References

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