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CVE-2026-50167

Kurrier: Authenticated cross-user authorization bypass in Kurrier API

MEDIUM
5.3
CVSS Score
Published: August 18, 2026 at 06:01 PM UTC
Updated: October 22, 2026 at 10:10 PM UTC
1 product affected across 1 vendorKurrier

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Kurrier· Kurrier Org
90%
v < 1.2.4
Affected range stops below 1.2.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

x_refsource_CONFIRM
Source: cverecord
https://github.com/kurrier-org/kurrier/security/advisories/GHSA-f7h3-f5vh-3764
x_refsource_MISC
Source: cverecord
https://github.com/kurrier-org/kurrier/pull/446
x_refsource_MISC
Source: cverecord
https://github.com/kurrier-org/kurrier/commit/22fad36fb1bc79e3038184ddd485fb235217475c
x_refsource_MISC
Source: cverecord
https://github.com/kurrier-org/kurrier/releases/tag/v1.2.4

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-639

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