# CVE-2026-21880: Kanboard LDAP Injection Vulnerability can Lead to User Enumeration and Information Disclosure

> Attackers can inject LDAP queries to enumerate users and disclose sensitive attributes, requiring LDAP authentication to be enabled.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Jan 2026
- **Updated:** 8 Jan 2026
- **Also known as:** GHSA-v66r-m28r-wmq7

## What is CVE-2026-21880?

CVE-2026-21880 is a medium-severity vulnerability in kanboard, published on 8 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-90 (Improper Neutralization of Special Elements used in an LDAP Query), CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2026-21880?

It affects 1 product.


Products: Kanboard Kanboard.

## How do I fix CVE-2026-21880?

No fix has been published for CVE-2026-21880 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-21880 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-21880 exists.

## Other vulnerabilities in kanboard

- [CVE-2026-21881](https://insights.sbomify.com/CVE-2026-21881/): Kanboard is Vulnerable to Reverse Proxy Authentication Bypass (critical 9.1)
- [CVE-2025-55010](https://insights.sbomify.com/CVE-2025-55010/): Kanboard Authenticated Admin Remote Code Execution via Unsafe Deserialization of Events (critical 9.1)
- [CVE-2024-51747](https://insights.sbomify.com/CVE-2024-51747/): Arbitrary File Read and Delete in kanboard (critical 9.1)
- [CVE-2024-51748](https://insights.sbomify.com/CVE-2024-51748/): Remote code execution through language setting in kanboard (critical 9.1)
- [CVE-2017-12850](https://insights.sbomify.com/CVE-2017-12850/): Business logic in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-21880 and fix it if it is affected.

What it is: CVE-2026-21880 is a medium-severity vulnerability in kanboard, published on 8 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-21880 exists.

Affected product: kanboard. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-21880/ (Markdown: https://insights.sbomify.com/CVE-2026-21880/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-21880
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-21880
- OSV: https://osv.dev/vulnerability/CVE-2026-21880

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-21880/
Summaries are generated and may contain mistakes; the official description above is the record.