[PR #24587] fix: block private-IP webhook URLs to close SSRF on caller-controlled URL #115039

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GiteaMirror · 2026-05-18T15:58:19-05:00

GiteaMirror commented

2026-05-18 15:58:19 -05:00

📋 Pull Request Information

Original PR: https://github.com/open-webui/open-webui/pull/24587
Author: @Classic298
Created: 5/11/2026
Status: 🔄 Open

Base: dev ← Head: fix/ssrf-webhook-oauth-reranker-validate-url

📝 Commits (2)

b5b2114 fix: block private-IP webhook URLs to close SSRF on caller-controlled URL
b585aa9 fix: also pass allow_redirects=False on webhook post_webhook session.post

📊 Changes

1 file changed (+17 additions, -2 deletions)

View changed files

📝 backend/open_webui/utils/webhook.py (+17 -2)

📄 Description

post_webhook(url, ...) in utils/webhook.py forwards the URL straight to aiohttp.ClientSession.post with no SSRF gate. The URL is caller-controlled on two surfaces:

User notification settings under ENABLE_USER_WEBHOOKS=true — any authenticated user can set the URL their notifications POST to.
Automation notification triggers (calendar alerts, etc.).

Without a gate, the URL can target cloud metadata (169.254.169.254 / fd00:ec2::254), localhost-bound services, RFC1918 internal hosts, or any other private address reachable from the server process. Blind SSRF — no response body returned to the caller — but enough to enumerate internal services via response timing / status codes, and on cloud deployments enough to issue requests against IMDSv1 if available.

Call validate_url() at the top of post_webhook. The function blocks private/reserved IPs when ENABLE_RAG_LOCAL_WEB_FETCH is False (the default), is the project's chosen SSRF gate, and is already applied to the equivalent fetch surfaces (retrieval, image-load, OAuth profile picture). Operators who legitimately need to webhook to private IPs (internal monitoring, self-hosted Slack alternatives, etc.) can set ENABLE_RAG_LOCAL_WEB_FETCH=True — same opt-out as the other gated surfaces.

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Deleting the CLA section will lead to immediate closure of your PR and it will not be merged in.

_{🔄 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/24587 **Author:** [@Classic298](https://github.com/Classic298) **Created:** 5/11/2026 **Status:** 🔄 Open **Base:** `dev` ← **Head:** `fix/ssrf-webhook-oauth-reranker-validate-url` --- ### 📝 Commits (2) - [`b5b2114`](https://github.com/open-webui/open-webui/commit/b5b21141b424219e1edb7ab97a5024c76995c924) fix: block private-IP webhook URLs to close SSRF on caller-controlled URL - [`b585aa9`](https://github.com/open-webui/open-webui/commit/b585aa95ebdae4c381c2c24463bc9926c3c980df) fix: also pass allow_redirects=False on webhook post_webhook session.post ### 📊 Changes **1 file changed** (+17 additions, -2 deletions) <details> <summary>View changed files</summary> 📝 `backend/open_webui/utils/webhook.py` (+17 -2) </details> ### 📄 Description post_webhook(url, ...) in utils/webhook.py forwards the URL straight to aiohttp.ClientSession.post with no SSRF gate. The URL is caller-controlled on two surfaces: - User notification settings under ENABLE_USER_WEBHOOKS=true — any authenticated user can set the URL their notifications POST to. - Automation notification triggers (calendar alerts, etc.). Without a gate, the URL can target cloud metadata (169.254.169.254 / fd00:ec2::254), localhost-bound services, RFC1918 internal hosts, or any other private address reachable from the server process. Blind SSRF — no response body returned to the caller — but enough to enumerate internal services via response timing / status codes, and on cloud deployments enough to issue requests against IMDSv1 if available. Call validate_url() at the top of post_webhook. The function blocks private/reserved IPs when ENABLE_RAG_LOCAL_WEB_FETCH is False (the default), is the project's chosen SSRF gate, and is already applied to the equivalent fetch surfaces (retrieval, image-load, OAuth profile picture). Operators who legitimately need to webhook to private IPs (internal monitoring, self-hosted Slack alternatives, etc.) can set ENABLE_RAG_LOCAL_WEB_FETCH=True — same opt-out as the other gated surfaces. ### 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 15:58:19 -05:00

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Reference: github-starred/open-webui#115039