### Summary Manually modifying chat history allows setting the `html` property within document metadata. This causes the frontend to enter a code path that treats document contents as HTML, and render them in an iFrame when the citation is previewed. This allows stored XSS via a weaponised document payload in a chat. The payload also executes when the citation is viewed on a shared chat. ### Details The vulnerability stems from how iFrame are implemented here: https://github.com/open-webui/open-webui/blob/6f1486ffd0cb288d0e21f41845361924e0d742b3/src/lib/components/chat/Messages/Citations/CitationModal.svelte#L163-L170 The `html` attribute can be controlled by a user who manually edits the chat history. Since `allow-scripts` and `allow-same-origin` are harcoded here the sandboxing offers essentially no protection. ### PoC Create an arbitrary chat with a file upload attached: <img width="2462" height="1148" alt="image" src="https://github.com/user-attachments/assets/fad83c74-036d-41b8-bc44-87bf2a538b21" /> Edit the response <img width="768" height="206" alt="image" src="https://github.com/user-attachments/assets/41a7342a-cc41-433e-8820-0bc6ed08ddd7" /> <img width="2142" height="796" alt="image" src="https://github.com/user-attachments/assets/fb731111-e082-4172-80d1-34cff6b2a511" /> Before saving, configure the browser to use an HTTP proxy tool (Burp/Caido/ZAP) and intercept the save request. Find the object within the `history` and then `messages` objects (not the `messages` array) that contains the document source. <img width="2122" height="1388" alt="image" src="https://github.com/user-attachments/assets/1b4fbced-a6de-414d-b063-9cae44e3f449" /> Add `html: true` to metadata, update the document to an XSS payload, and forward the request. <img width="2240" height="1358" alt="image" src="https://github.com/user-attachments/assets/fd27971b-f707-458f-a14d-254f9f3ad1fa" /> Observe the payload is rendered in the iFrame and the javascript executes. <img width="2698" height="1696" alt="image" src="https://github.com/user-attachments/assets/b4e31cb4-d4cc-41a9-be42-802e9b1a798d" /> The payload also executes when viewed from a shared version of the chat. <img width="2742" height="1258" alt="image" src="https://github.com/user-attachments/assets/92ee501d-8f14-4c32-8f3c-f4d3ca304ee5" /> ### Impact Any user can create a weaponised chat that can be shared and subsequently used to target other users. Low privilege users are at risk of having their session taken over by a payload that reads their token from local storage and exfiltrates it to an attacker controlled server. Admins are at risk of exposing the server to RCE via same chain described in https://github.com/advisories/GHSA-w7xj-8fx7-wfch. ### Caveats The victim must expand the sources and click the document containing the payload to trigger this issue.
### Summary Manually modifying chat history allows setting the `html` property within document metadata. This causes the frontend to enter a code path that treats document contents as HTML, and render them in an iFrame when the citation is previewed. This allows stored XSS via a weaponised document payload in a chat. The payload also executes when the citation is viewed on a shared chat. ### Details The vulnerability stems from how iFrame are implemented here: https://github.com/open-webui/open-webui/blob/6f1486ffd0cb288d0e21f41845361924e0d742b3/src/lib/components/chat/Messages/Citations/CitationModal.svelte#L163-L170 The `html` attribute can be controlled by a user who manually edits the chat history. Since `allow-scripts` and `allow-same-origin` are harcoded here the sandboxing offers essentially no protection. ### PoC Create an arbitrary chat with a file upload attached: <img width="2462" height="1148" alt="image" src="https://github.com/user-attachments/assets/fad83c74-036d-41b8-bc44-87bf2a538b21" /> Edit the response <img width="768" height="206" alt="image" src="https://github.com/user-attachments/assets/41a7342a-cc41-433e-8820-0bc6ed08ddd7" /> <img width="2142" height="796" alt="image" src="https://github.com/user-attachments/assets/fb731111-e082-4172-80d1-34cff6b2a511" /> Before saving, configure the browser to use an HTTP proxy tool (Burp/Caido/ZAP) and intercept the save request. Find the object within the `history` and then `messages` objects (not the `messages` array) that contains the document source. <img width="2122" height="1388" alt="image" src="https://github.com/user-attachments/assets/1b4fbced-a6de-414d-b063-9cae44e3f449" /> Add `html: true` to metadata, update the document to an XSS payload, and forward the request. <img width="2240" height="1358" alt="image" src="https://github.com/user-attachments/assets/fd27971b-f707-458f-a14d-254f9f3ad1fa" /> Observe the payload is rendered in the iFrame and the javascript executes. <img width="2698" height="1696" alt="image" src="https://github.com/user-attachments/assets/b4e31cb4-d4cc-41a9-be42-802e9b1a798d" /> The payload also executes when viewed from a shared version of the chat. <img width="2742" height="1258" alt="image" src="https://github.com/user-attachments/assets/92ee501d-8f14-4c32-8f3c-f4d3ca304ee5" /> ### Impact Any user can create a weaponised chat that can be shared and subsequently used to target other users. Low privilege users are at risk of having their session taken over by a payload that reads their token from local storage and exfiltrates it to an attacker controlled server. Admins are at risk of exposing the server to RCE via same chain described in https://github.com/advisories/GHSA-w7xj-8fx7-wfch. ### Caveats The victim must expand the sources and click the document containing the payload to trigger this issue.
Update open-webui to 0.7.0 if you use the affected versions. Test the change in a non-production environment first.
Local check
hol-guard supply-chain scanOpen WebUI vulnerable to Stored XSS via iFrame in citations model affects open-webui (pip). Severity is high. ### Summary Manually modifying chat history allows setting the `html` property within document metadata. This causes the frontend to enter a code path that treats document contents as HTML, and render them in an iFrame when the citation is previewed. This allows stored XSS via a weaponised document payload in a chat. The payload also executes when the citation is viewed on a shared chat. ### Details The vulnerability stems from how iFrame are implemented here: https://github.com/open-webui/open-webui/blob/6f1486ffd0cb288d0e21f41845361924e0d742b3/src/lib/components/chat/Messages/Citations/CitationModal.svelte#L163-L170 The `html` attribute can be controlled by a user who manually edits the chat history. Since `allow-scripts` and `allow-same-origin` are harcoded here the sandboxing offers essentially no protection. ### PoC Create an arbitrary chat with a file upload attached: <img width="2462" height="1148" alt="image" src="https://github.com/user-attachments/assets/fad83c74-036d-41b8-bc44-87bf2a538b21" /> Edit the response <img width="768" height="206" alt="image" src="https://github.com/user-attachments/assets/41a7342a-cc41-433e-8820-0bc6ed08ddd7" /> <img width="2142" height="796" alt="image" src="https://github.com/user-attachments/assets/fb731111-e082-4172-80d1-34cff6b2a511" /> Before saving, configure the browser to use an HTTP proxy tool (Burp/Caido/ZAP) and intercept the save request. Find the object within the `history` and then `messages` objects (not the `messages` array) that contains the document source. <img width="2122" height="1388" alt="image" src="https://github.com/user-attachments/assets/1b4fbced-a6de-414d-b063-9cae44e3f449" /> Add `html: true` to metadata, update the document to an XSS payload, and forward the request. <img width="2240" height="1358" alt="image" src="https://github.com/user-attachments/assets/fd27971b-f707-458f-a14d-254f9f3ad1fa" /> Observe the payload is rendered in the iFrame and the javascript executes. <img width="2698" height="1696" alt="image" src="https://github.com/user-attachments/assets/b4e31cb4-d4cc-41a9-be42-802e9b1a798d" /> The payload also executes when viewed from a shared version of the chat. <img width="2742" height="1258" alt="image" src="https://github.com/user-attachments/assets/92ee501d-8f14-4c32-8f3c-f4d3ca304ee5" /> ### Impact Any user can create a weaponised chat that can be shared and subsequently used to target other users. Low privilege users are at risk of having their session taken over by a payload that reads their token from local storage and exfiltrates it to an attacker controlled server. Admins are at risk of exposing the server to RCE via same chain described in https://github.com/advisories/GHSA-w7xj-8fx7-wfch. ### Caveats The victim must expand the sources and click the document containing the payload to trigger this issue.
AI coding agents often install or upgrade packages automatically in pip. A high vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.
| Package | Affected range | Fixed version |
|---|---|---|
| open-webuipip | <0.7.0 | 0.7.0 |
Fixed versions are reported by the source feed; confirm compatibility before updating.
Reported by GitHub Security Advisories (ghsa).
HOL Guard can help your team review package activity against supported protection paths.
Explore HOL GuardUpdate open-webui to 0.7.0 if you use the affected versions. Test the change in a non-production environment first.
Local check
hol-guard supply-chain scanOpen WebUI vulnerable to Stored XSS via iFrame in citations model affects open-webui (pip). Severity is high. ### Summary Manually modifying chat history allows setting the `html` property within document metadata. This causes the frontend to enter a code path that treats document contents as HTML, and render them in an iFrame when the citation is previewed. This allows stored XSS via a weaponised document payload in a chat. The payload also executes when the citation is viewed on a shared chat. ### Details The vulnerability stems from how iFrame are implemented here: https://github.com/open-webui/open-webui/blob/6f1486ffd0cb288d0e21f41845361924e0d742b3/src/lib/components/chat/Messages/Citations/CitationModal.svelte#L163-L170 The `html` attribute can be controlled by a user who manually edits the chat history. Since `allow-scripts` and `allow-same-origin` are harcoded here the sandboxing offers essentially no protection. ### PoC Create an arbitrary chat with a file upload attached: <img width="2462" height="1148" alt="image" src="https://github.com/user-attachments/assets/fad83c74-036d-41b8-bc44-87bf2a538b21" /> Edit the response <img width="768" height="206" alt="image" src="https://github.com/user-attachments/assets/41a7342a-cc41-433e-8820-0bc6ed08ddd7" /> <img width="2142" height="796" alt="image" src="https://github.com/user-attachments/assets/fb731111-e082-4172-80d1-34cff6b2a511" /> Before saving, configure the browser to use an HTTP proxy tool (Burp/Caido/ZAP) and intercept the save request. Find the object within the `history` and then `messages` objects (not the `messages` array) that contains the document source. <img width="2122" height="1388" alt="image" src="https://github.com/user-attachments/assets/1b4fbced-a6de-414d-b063-9cae44e3f449" /> Add `html: true` to metadata, update the document to an XSS payload, and forward the request. <img width="2240" height="1358" alt="image" src="https://github.com/user-attachments/assets/fd27971b-f707-458f-a14d-254f9f3ad1fa" /> Observe the payload is rendered in the iFrame and the javascript executes. <img width="2698" height="1696" alt="image" src="https://github.com/user-attachments/assets/b4e31cb4-d4cc-41a9-be42-802e9b1a798d" /> The payload also executes when viewed from a shared version of the chat. <img width="2742" height="1258" alt="image" src="https://github.com/user-attachments/assets/92ee501d-8f14-4c32-8f3c-f4d3ca304ee5" /> ### Impact Any user can create a weaponised chat that can be shared and subsequently used to target other users. Low privilege users are at risk of having their session taken over by a payload that reads their token from local storage and exfiltrates it to an attacker controlled server. Admins are at risk of exposing the server to RCE via same chain described in https://github.com/advisories/GHSA-w7xj-8fx7-wfch. ### Caveats The victim must expand the sources and click the document containing the payload to trigger this issue.
AI coding agents often install or upgrade packages automatically in pip. A high vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.
| Package | Affected range | Fixed version |
|---|---|---|
| open-webuipip | <0.7.0 | 0.7.0 |
Fixed versions are reported by the source feed; confirm compatibility before updating.
Reported by GitHub Security Advisories (ghsa).
HOL Guard can help your team review package activity against supported protection paths.
Explore HOL Guard