CVE-2026-50167 Kurrier: Authenticated cross-user authorization bypass in Kurrier API
Authenticated attackers can read other users' webhook and identity metadata due to missing ownership checks in API endpoints.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-50167?
CVE-2026-50167 is a medium-severity missing authorization vulnerability in kurrier-org kurrier, published on 18 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Kurrier is a modern, self-hosted workspace for email, calendar, contacts, and storage. Prior to 1.2.4, Kurrier API endpoints for listing and retrieving webhook and identity resources did not enforce ownership checks for authenticated API requests. An attacker with a valid API key could use another account's identifiers to read and enumerate webhook and identity resources belonging to that account through apps/worker/server/routes/api/kurrier/webhooks/[id].get.ts, apps/worker/server/routes/api/kurrier/webhooks/index.get.ts, apps/worker/server/routes/api/kurrier/identities/[id].get.ts, and apps/worker/server/routes/api/kurrier/identities/index.get.ts. Anonymous requests and invalid API keys were rejected, and cross-user modification operations were blocked, but affected GET and list operations could expose another user's resource metadata. This issue is fixed in version 1.2.4.
Weakness: CWE-639
Which versions are affected by CVE-2026-50167?
How do I fix CVE-2026-50167?
No fix has been published for CVE-2026-50167 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-50167 being exploited?
There is no known exploitation of CVE-2026-50167 in the wild and no public exploit code.
Sources
Also known as GHSA-f7h3-f5vh-3764.