[PR #24625] fix: gate get_image_base64_from_url file_id lookup by caller ownership #115056

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GiteaMirror · 2026-05-18T15:59:37-05:00

GiteaMirror commented

2026-05-18 15:59:37 -05:00

📋 Pull Request Information

Original PR: https://github.com/open-webui/open-webui/pull/24625
Author: @Classic298
Created: 5/12/2026
Status: 🔄 Open

Base: dev ← Head: fix/image-url-file-id-ownership

📝 Commits (1)

5007e91 fix: gate get_image_base64_from_url file_id lookup by caller ownership

📊 Changes

2 files changed (+20 additions, -4 deletions)

View changed files

📝 backend/open_webui/utils/files.py (+17 -1)
📝 backend/open_webui/utils/middleware.py (+3 -3)

📄 Description

convert_url_images_to_base64() in utils/middleware.py was calling get_image_base64_from_url(url) without passing the authenticated user. When the url didn't start with http(s):// or data:image/, the helper treated it as a file_id and resolved it via Files.get_file_by_id(url) with no ownership filter — read the file from disk, base64-encoded it, and inlined it into the LLM request as an image_url attachment.

An authenticated user could put another user's file_id (UUIDs leak through shared chats, KB membership, chat exports, etc.) into an image_url.url field on /api/chat/completions and ask the model to describe / OCR the file. The server's read of the victim file went through unchecked; the LLM response carried the file content back to the caller.

Thread user through convert_url_images_to_base64() and through get_image_base64_from_url(). Gate the file-by-id branch by the same pattern used at the other file-access call sites: owner, admin under the documented bypass posture, or explicit has_access_to_file('read') grant (covering shared KBs / channels / shared chats). Callers that don't have a user in scope get None back — same as the existing "file not found" code path.

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_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/open-webui/open-webui/pull/24625 **Author:** [@Classic298](https://github.com/Classic298) **Created:** 5/12/2026 **Status:** 🔄 Open **Base:** `dev` ← **Head:** `fix/image-url-file-id-ownership` --- ### 📝 Commits (1) - [`5007e91`](https://github.com/open-webui/open-webui/commit/5007e914b4825675f858c19c0a69f168be58edb4) fix: gate get_image_base64_from_url file_id lookup by caller ownership ### 📊 Changes **2 files changed** (+20 additions, -4 deletions) <details> <summary>View changed files</summary> 📝 `backend/open_webui/utils/files.py` (+17 -1) 📝 `backend/open_webui/utils/middleware.py` (+3 -3) </details> ### 📄 Description convert_url_images_to_base64() in utils/middleware.py was calling get_image_base64_from_url(url) without passing the authenticated user. When the url didn't start with http(s):// or data:image/, the helper treated it as a file_id and resolved it via Files.get_file_by_id(url) with no ownership filter — read the file from disk, base64-encoded it, and inlined it into the LLM request as an image_url attachment. An authenticated user could put another user's file_id (UUIDs leak through shared chats, KB membership, chat exports, etc.) into an image_url.url field on /api/chat/completions and ask the model to describe / OCR the file. The server's read of the victim file went through unchecked; the LLM response carried the file content back to the caller. Thread `user` through convert_url_images_to_base64() and through get_image_base64_from_url(). Gate the file-by-id branch by the same pattern used at the other file-access call sites: owner, admin under the documented bypass posture, or explicit has_access_to_file('read') grant (covering shared KBs / channels / shared chats). Callers that don't have a user in scope get None back — same as the existing "file not found" code path. ### Contributor License Agreement  - [x] By submitting this pull request, I confirm that I have read and fully agree to the [Contributor License Agreement (CLA)](https://github.com/open-webui/open-webui/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT), and I am providing my contributions under its terms. > [!NOTE] > Deleting the CLA section will lead to immediate closure of your PR and it will not be merged in. --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

GiteaMirror added the pull-request label 2026-05-18 15:59:37 -05:00

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Reference: github-starred/open-webui#115056