PYSEC-2026-3058 Rucio WebUI Vulnerable to Stored Cross-site Scripting (XSS) through Custom Rule Function

Summary A stored Cross-site Scripting XSS vulnerability was identified in the Custom Rules function of the WebUI where attacker-controlled input is persisted by the backend and later rendered in the WebUI without proper output encoding. This allows arbitrary JavaScript execution in the context of...

PYSEC-2026-3057 Rucio WebUI has Stored Cross-site Scripting (XSS) in RSE Metadata

Summary A stored Cross-site Scripting XSS vulnerability was identified in the RSE metadata of the WebUI where attacker-controlled input is persisted by the backend and later rendered in the WebUI without proper output encoding. This allows arbitrary JavaScript execution in the context of the WebU...

PYSEC-2026-3056 Rucio WebUI has a Reflected Cross-site Scripting Vulnerability

Summary A reflected Cross-site Scripting vulnerability was located in the rendering of the ExceptionMessage of the WebUI 500 error which could allow attackers to steal login session tokens of users who navigate to a specially crafted URL. Details The WebUI error message renders ExceptionMessage...

Rucio WebUI has a Reflected Cross-site Scripting Vulnerability

SummaryA reflected Cross-site Scripting vulnerability was located in the rendering of the ExceptionMessage of the WebUI 500 error which could allow attackers to steal login session tokens of users who navigate to a specially crafted URL. DetailsThe WebUI error message renders ExceptionMessage whi...

PT-2026-59380

Summary An application-wide Cross-Site Request Forgery CSRF vulnerability was found Open-WebUl's image uploading functionality. An attacker can set an image URL to a malicious endpoint, allowing them to perform actions on behalf of a victim user. Any authenticated user can exploit this...

PT-2026-59369

Summary A user can modify another user's model even if its visibility is set to Private. The finding resulted from a penetration test for a customer. It is suspected that the root cause of the issue lies within the core of Open WebUI, which is why it is being reported as a security issue here...

PT-2026-59402

Summary Open WebUI lets a user who can create, update, or import workspace models store arbitrary meta.knowledge entries on their model without checking whether they own or can read the referenced files. Open WebUI then treats meta.knowledge entries of type file as an authorization source in two...

PT-2026-59378

Summary A path traversal vulnerability exists in open-webui's cache file serving endpoint that allows any authenticated user to read files from sibling directories outside the intended cache directory, by exploiting an incomplete startswith containment check that lacks a trailing path separator...

PT-2026-59383

Summary A regular user non-admin can view the system prompt of the model which is set by an admin. Details When a regular user non-admin logs into the application, a http://IP:8080/api/models? web request is initiated by the application and in response, it reveals the system prompt of available...

PT-2026-59400

Summary Open WebUI renders Mermaid blocks from Markdown files in the file preview panel and inserts the generated SVG into the DOM using innerHTML. Because Mermaid is configured with securityLevel: 'loose', attacker-controlled Mermaid content can be rendered unsafely in this flow. A working paylo...

PT-2026-59379

CONFIDENTIAL Vulnerability Disclosure Analysis Documentation ----------------------------------------------- Vulnerability Details --------------------- 1. Discoverer: Taylor Pennington of KoreLogic, Inc. 2. Date Submitted: June 11, 2024 3. Title: Open WebUI Arbitrary File Write, Delete via Path...

PT-2026-59347

CONFIDENTIAL Vulnerability Disclosure Analysis Documentation --- Vulnerability Details | | Field | Value | |---|-------|-------| | 1 | Discoverer | Taylor Pennington of KoreLogic, Inc. | | 2 | Date Submitted | June 11, 2024 | | 3 | Title | Open WebUI Improper Authorization Control | | 5 | Affecte...

PT-2026-59373

Related advisory This advisory tracks a regression of the original Excel-preview XSS that was publicly disclosed and patched under GHSA-jwf8-pv5p-vhmc patched in v0.8.0. The same root cause — XLSX.utils.sheet to html output rendered via @html excelHtml without DOMPurify — was reintroduced sometim...

PT-2026-59360

CONFIDENTIAL KL-CAN-2024-002 Vulnerability Details | | Field | Value | |---|-------|-------| | 1 | Discoverer | Jaggar Henry & Sean Segreti of KoreLogic, Inc. | | 2 | Date Submitted | 2024.03.12 | | 3 | Title | Open WebUI Arbitrary File Upload + Path Traversal | | 5 | Affected Vendor | Open WebUI...

PT-2026-59366

Summary Blind server side request forgery SSRF via the PDF generate function. The finding resulted from a penetration test for a customer. It is suspected that the root cause of the issue lies within the core of Open WebUI, which is why it is being reported as a security issue here. Tested on Ope...

PT-2026-59398

Stored XSS to Account Takeover via Model Profile Images in Open WebUI Affected: Open WebUI tags. On the output side, users.py added a MIME allowlist check and X-Content-Type-Options: nosniff. The fix was applied to UserUpdateForm, UpdateProfileForm, and later to ChannelWebhookForm. Three models...

PT-2026-59353

Summary Broken Access Control in Tool Valves Open WebUI supports function calling through "Tools". Function calling allows an LLM to reliably connect to external tools and interact with external APIs. Exemplary use-cases include connecting to an internal knowledge base, retrieving emails from an...

PT-2026-59390

Summary The audio transcription upload endpoint takes the file extension from the user-supplied filename and saves the file under CACHE DIR/audio/transcriptions/.. The /cache/path route serves these files via FileResponse, which sets Content-Type from the on-disk extension and emits no...

PT-2026-59339

As part of our research on improving our AI pentest, we have uncovered the following issue in Open WebUI. We've manually verified and tided up the report, but you can also find the original agent finding at the bottom of this report. Summary The channel webhook create/update flow accepts arbitrar...

PT-2026-59345

Summary Open WebUI v0.6.43 contains a vulnerability in its chat completion API, which allows attackers to bypass tool restrictions, potentially enabling unauthorized actions or access. Details In the chat completion API, the parameters tool ids and tool servers are supplied by the user. These...