Open WebUI: Read-Only Users Can Toggle Note Pin Status via Incorrect Permission Check (Write via Read-Only Access)

Exploitation

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

CVSS

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

EPSS

• CVE-2026-45316: 0.24% estimated exploitation activity in the next 30 days; percentile 14.59 (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 The POST /api/v1/notes/{id}/pin endpoint performs a write operation (toggling the ispinned field) but only checks for read permission. Users with read-only access to a shared note can pin/unpin it, which is a state-modifying action that should require write permission. All other write endpoints (update, delete, access/update) correctly check for write permission. Details Affected code: backend/openwebui/routers/notes.py lines 412-444 Compare with update endpoint (correct, line 318-327): PoC Environment: Open WebUI v0.9.2, default configuration with notes sharing enabled. Setup: 1. UserA creates a note 2. UserA shares note with UserB with read permission via POST /api/v1/notes/{id}/access/update with {"accessgrants":[{"principaltype":"user","principalid":"USERBID","permission":"read"}]} Test: E2E Verified Result: - Step 1: UserB reads note (READ) - 200 OK ✓ - Step 2: UserB updates note (WRITE) - 403 Forbidden ✓ (correctly blocked) - Step 3: UserB pins note (WRITE via READ) -…

Published by the source

14 May 2026, 20:18 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-jx2x-j75f-xq3j

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-jx2x-j75f-xq3j

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# Patch Next advisory brief: CVE-2026-45316

Advisory: Open WebUI: Read-Only Users Can Toggle Note Pin Status via Incorrect Permission Check (Write via Read-Only Access)
IDs: CVE-2026-45316, GHSA-jx2x-j75f-xq3j
Record: https://patchnext.com/advisories/cve-2026-45316 (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: Low (CVSS 3.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: open-webui 0.9.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI open-webui: affected <= 0.9.2; fixed in 0.9.3

## 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-jx2x-j75f-xq3j (OSV record GHSA-jx2x-j75f-xq3j lists affected ranges: PyPI open-webui >=0 <0.9.3 (fixed))
- Verified: https://github.com/advisories/GHSA-jx2x-j75f-xq3j (GitHub-reviewed advisory GHSA-jx2x-j75f-xq3j lists affected ranges: PyPI open-webui >=0 <=0.9.2)

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