CVE-2026-21880: Kanboard is project management software focused on Kanban methodology

Q: How do I fix CVE-2026-21880?

kanboard: upgrade to 1.2.49. Exact commands for each OS are on this page.

Q: Is CVE-2026-21880 being exploited?

CVE-2026-21880 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-2026-21880 affect?

CVE-2026-21880 affects kanboard. Severity is medium (CVSS 5.3). Kanboard is project management software focused on Kanban methodology. Versions 1.2.48 and below have an LDAP Injection vulnerability in the LDAP authentication mechanism. User-supplied input is directly substituted into LDAP search filters

Q: How urgent is CVE-2026-21880?

Priority 37/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-21880 is a medium-severity flaw (CVSS 5.3) affecting kanboard. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Kanboard is project management software focused on Kanban methodology. Versions 1.2.48 and below have an LDAP Injection vulnerability in the LDAP authentication mechanism. User-supplied input is directly substituted into LDAP search filters without proper sanitization, allowing attackers to enumerate all LDAP users, discover sensitive user attributes, and perform targeted attacks against specific accounts. This issue is fixed in version 1.2.49.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-90, CWE-200
Published	2026-01-08
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: kanboard

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

Am I affected?

Timeline

2026-01-08 02:15 UTCPublished CVE record published
2026-06-17 10:19 UTCUpdated Record last modified

kanboard kanboard UPGRADE

Affected: < 1.2.49

Fixed in: 1.2.49

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy kanboard || rpm -q kanboard || kanboard --version

2. UPGRADE to 1.2.49 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade kanboard

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kanboard

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-2026-21880?

kanboard: upgrade to 1.2.49. Exact commands for each OS are on this page.

Is CVE-2026-21880 being exploited?

CVE-2026-21880 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-2026-21880 affect?

CVE-2026-21880 affects kanboard. Severity is medium (CVSS 5.3). Kanboard is project management software focused on Kanban methodology. Versions 1.2.48 and below have an LDAP Injection vulnerability in the LDAP authentication mechanism. User-supplied input is directly substituted into LDAP search filters

How urgent is CVE-2026-21880?

Priority 37/100. Public exploit reference; Remotely exploitable, no login, no user action

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CVE-2026-33058 MEDIUM 6.5 UPGRADE Kanboard is project management software focused on Kanban methodology
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CVE-2026-25531 MEDIUM 4.3 UPGRADE Kanboard is project management software focused on Kanban methodology
CVE-2026-25530 MEDIUM 4.3 UPGRADE Kanboard is project management software focused on Kanban methodology

References

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