Open WebUI: Upload `metadata.knowledge_id` bypasses the knowledge-base write-access check (read-only users can add files to KB)

Open WebUI upload metadata can add files to knowledge bases without write permission Summary Open WebUI's file upload background processing trusts the client-supplied metadata.knowledgeid value and inserts a knowledgefile association before validating that the uploading user has write access to t...

Open WebUI: Cross-user code-interpreter and tool execution via unvalidated Socket.IO event-caller session_id

Summary An authenticated low-privilege user can execute arbitrary code-interpreter Python and tools inside another user's authenticated session. The Socket.IO event-caller geteventcall delivers execute:python / execute:tool events to a client-supplied sessionid after only checking that the sessio...

Missing Authorization

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Missing Authorization through the geteventcall process. An attacker can execute arbitrary code and tools in another user's authenticated session by supplying a victim's sessionid and leveraging the lack of...

EUVD-2026-42627

Open WebUI: Cross-user code-interpreter and tool execution via unvalidated Socket.IO event-caller sessionid...

Missing Authorization

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Missing Authorization through the chat completion process. An attacker can overwrite messages in channels they do not belong to, including private and direct message channels, by supplying a crafted chatid an...

EUVD-2026-42625

Open WebUI: Realtime endpoints accept Redis-revoked JWTs after signout/backchannel logout...

Insufficient Session Expiration

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Insufficient Session Expiration in the realtime authentication process. An attacker can maintain unauthorized access to realtime features by using a JWT that has been revoked via sign-out or back-channel...

Incorrect Authorization

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Incorrect Authorization via the /api/v1/images/edit route. An attacker can trigger server-side image editing operations using administrator-configured credentials, even when global image editing is disabled o...

EUVD-2026-42618

Open WebUI: POST /api/v1/images/edit bypasses the global image-edit switch and the per-user image-generation permission...

Open WebUI: POST /api/v1/images/edit bypasses the global image-edit switch and the per-user image-generation permission

Summary POST /api/v1/images/edit performed no authorization beyond requiring a verified account. Every other image-editing surface in Open WebUI enforces the global image-edit switch and the per-user image-generation permission — the /api/v1/images/generations route, the built-in editimage tool,...

GHSA-FFPJ-XV5C-P3GW Open WebUI: ReDoS in skill-mention regexes causes whole-instance DoS on default config

Summary Two regexes in backend/openwebui/utils/middleware.py that parse skill-mention tags backtrack in On² on input that contains . Both run synchronously, on the asyncio event loop, on every chat completion with no feature gate. Because the default deployment is a single uvicorn worker, one suc...

Open WebUI: ReDoS in skill-mention regexes causes whole-instance DoS on default config

Summary Two regexes in backend/openwebui/utils/middleware.py that parse skill-mention tags backtrack in On² on input that contains . Both run synchronously, on the asyncio event loop, on every chat completion with no feature gate. Because the default deployment is a single uvicorn worker, one suc...

EUVD-2026-42620

Open WebUI: Scheduled automations continue after pending-user deactivation and stored model ACL revocation...

Timing Attack

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Timing Attack via the signin process. An attacker can determine whether specific email addresses are registered by measuring the response time of authentication attempts. Remediation Upgrade open-webui to...

EUVD-2026-42617

Open WebUI: Account enumeration via observable login timing discrepancy...

EUVD-2026-42616

Open WebUI: Stored web worker XSS via Pyodide...

CVE-2026-66032

libssh2

CVE-2026-66032

libssh2 through 1.11.1, fixed in commit 5e47761, contains a double-free vulnerability in the sftpopen function in src/sftp.c that allows a malicious SSH server to corrupt the heap of any authenticated client opening an SFTP session. When a server responds to SSHFXPOPEN with SSHFXPSTATUS containin...

EUVD-2026-48719

libssh2 through 1.11.1, fixed in commit 5e47761, contains a double-free vulnerability in the sftpopen function in src/sftp.c that allows a malicious SSH server to corrupt the heap of any authenticated client opening an SFTP session. When a server responds to SSHFXPOPEN with SSHFXPSTATUS containin...

CVE-2026-66032

libssh2 through 1.11.1, fixed in commit 5e47761, contains a double-free vulnerability in the sftpopen function in src/sftp.c that allows a malicious SSH server to corrupt the heap of any authenticated client opening an SFTP session. When a server responds to SSHFXPOPEN with SSHFXPSTATUS containin...