Open WebUI vulnerable to blind server side request forgery (SSRF) via the PDF generate function

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

4.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS

• CVE-2026-45347: 0.19% estimated exploitation activity in the next 30 days; percentile 8.23 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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 Open WebUI 0.5.4. Details In the PDF export, user inputs are interpreted as HTML and embedded into the PDF. According to tests, scripts and some potentially dangerous tags (iFrame, Object, etc.) are blocked, preventing server-side content from being read through this vulnerability. However, an image tag can be used to force a server-side request (SSRF), as shown in the following below. PoC Start a chat and export the PDF: Intercept the request and insert an <img tag into the title: A HTTPS callback was received at https://d5jok0s7ghl1p77v5brlqlxwmnsega4z.oastify.com. Impact A user can force server-side GET requests. During the available testing time, no method was found to read the responses…

Published by the source

14 May 2026, 20:22 UTC

Last modified by the source

13 Jul 2026, 16:42 UTC

Source last checked

26 Oct 2026, 13:41 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-f776-fp4w-266c

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-f776-fp4w-266c

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-45347

Advisory: Open WebUI vulnerable to blind server side request forgery (SSRF) via the PDF generate function
IDs: CVE-2026-45347, GHSA-f776-fp4w-266c
Record: https://patchnext.com/advisories/cve-2026-45347 (revision 2, source checked 26 Oct 2026, 13:41 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: open-webui 0.5.11. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI open-webui: affected < 0.5.11; fixed in 0.5.11

## Suggested inspection (read-only)
- `python -m pip show open-webui`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on open-webui.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-f776-fp4w-266c (OSV record GHSA-f776-fp4w-266c lists affected ranges: PyPI open-webui >=0 <0.5.11 (fixed))
- Verified: https://github.com/advisories/GHSA-f776-fp4w-266c (GitHub-reviewed advisory GHSA-f776-fp4w-266c lists affected ranges: PyPI open-webui >=0 <0.5.11)

Commands are suggestions: review each one before running it.