CVE-2026-50167
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk35th percentile - higher than 35% of all known CVEs
Summary
Kurrier before 1.2.4 did not enforce ownership checks for authenticated API requests in endpoints for listing and retrieving webhook and identity resources. 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. 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.
Risk Assessment
Exposure of webhook and identity metadata of other users can lead to privacy breaches and potentially enable further attacks.
Recommendation
Update Kurrier to version 1.2.4 or later.
Original NVD description (English source)
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.