Vulnerability · Published Mar 18, 2026 · Assigned by GitHub_M

CVE-2026-29056Kanboard's privilege escalation via mass assignment in user invite registration allows any invited user to become admin

High 7.0

In plain English

A high-severity security flaw in kanboard from kanboard. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.0High

Exploit odds (30 days)0.4%top 66.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Kanboard is project management software focused on Kanban methodology. Prior to 1.2.51, Kanboard's user invite registration endpoint (`UserInviteController::register()`) accepts all POST parameters and passes them to `UserModel::create()` without filtering out the `role` field. An attacker who receives an invite link can inject `role=app-admin` in the registration form to create an administrator account. Version 1.2.51 fixes the issue.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:14	kanboard	1.2.51+ds-1	DEBIAN-CVE-2026-29056

Affected products (as reported)

Vendor	Product	Versions
kanboard	kanboard	< 1.2.51

Weakness: CWE-915 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:H/SI:N/SA:N/E:P

References

https://github.com/kanboard/kanboard/security/advisories/GHSA-2jvj-q44v-6p3x x_refsource_CONFIRM