Is CVE-2026-87015 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-87015?

CVE-2026-87015 has a CVSS v3 severity of MEDIUM (6.8).

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CVE-2026-87015

Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.6.27 until 0.11.1, backend/open_webui/utils/tools.py captured a cookie jar from the enclosing connection loop instead of binding it to each external tool callable. When multiple tool servers were attached and a session or system OAuth connection was processed last, a request to a different server configured for bearer authentication could include the calling user's Open WebUI session cookies, allowing that server's operator to reuse the session and take over the account. This issue is fixed in version 0.11.1.