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EUVD-2026-329844

fkie_cve-2026-54015

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, Open WebUI's prompt version-history endpoints authorize the prompt_id in the URL but then act on caller-supplied history IDs without verifying that the history row belongs to that prompt (history_entry.prompt_id == prompt.id). This affects /api/v1/prompts/id/{prompt_id}/history/diff, /api/v1/prompts/id/{prompt_id}/update/version, and /api/v1/prompts/id/{prompt_id}/history/{history_id}. An authenticated user with access to any prompt they control, plus a victim prompt_history.id, can read or delete another user's private prompt history. This vulnerability is fixed in 0.9.6.

GHSA-4r4w-2wgp-w7cj — Open WebUI Prompt history IDOR: unbound history_id allows cross-prompt read and deletion

Affected: PyPI: open-webui

## Summary

Open WebUI's prompt version-history endpoints authorize the `prompt_id` in the URL but then act on caller-supplied history IDs without verifying that the history row belongs to that prompt (`history_entry.prompt_id == prompt.id`). Three operations are affected:

- `GET /api/v1/prompts/id/{prompt_id}/history/diff` — returns another prompt's history snapshots (read). - `POST /api/v1/prompts/id/{prompt_id}/update/version` — restores another prompt's snapshot into the caller's prompt, exposing its content (read). - `DELETE /api/v1/prompts/id/{prompt_id}/history/{history_id}` — deletes another prompt's history entry (delete).

An authenticated user with access to any prompt they control, plus a victim `prompt_history.id`, can read or delete another user's private prompt history. The single-entry read endpoint (`GET .../history/{history_id}`) already enforces the binding; these three did not.

## Impact

Security boundary crossed: prompt confidentiality and integrity.

Prompt history snapshots can contain private prompt text, internal instructions, and sensitive variables. With a known victim `prompt_history.id`, an attacker can read another user's snapshot (via the diff endpoint or by restoring it into their own prompt) and delete another user's history entry. The active prompt row is not destroyed; the delete impact is against version history. Exploitation requires knowing or obtaining victim history UUIDs, so severity depends on adjacent ID exposure.

## Root Cause…

PYSEC-2026-2701 — Open WebUI Prompt history IDOR: unbound history_id allows cross-prompt read and deletion

Affected: PyPI: open-webui

## Summary

## Impact

Security boundary crossed: prompt confidentiality and integrity.

## Root Cause…