CVE-2026-52893 Wekan: OIDC Account Takeover via Unconditional Email-Based Account Merge in onCreateUser hook
Attackers can take over victim accounts by exploiting an OIDC login flaw that merges accounts based on unverified email or username matches.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-52893?
CVE-2026-52893 is a critical authentication bypass vulnerability in wekan, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Wekan is open source kanban built with Meteor. Prior to 9.32, the Wekan Accounts.onCreateUser hook in server/models/users.js merges OIDC logins into existing accounts when the OIDC email or username matches an existing Wekan user, without verifying ownership or checking email_verified. An attacker using an OIDC provider account with a victim's email or username can cause Wekan to merge the attacker's OIDC credentials into the victim account and then log in as that account. This issue is fixed in version 9.32.
Weakness: CWE-287
Which versions are affected by CVE-2026-52893?
How do I fix CVE-2026-52893?
No fix has been published for CVE-2026-52893 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-52893 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-52893 exists.
Sources
Also known as GHSA-mp7g-hj5q-gxhq.