Vulnerability · Published Jun 23, 2026 · Assigned by GitHub_M

CVE-2026-54015Open WebUI: Prompt history IDOR: unbound history_id allows cross-prompt read and deletion

Medium 6.4

In plain English

A medium-severity improper access control in open-webui from open-webui. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.4Medium

Exploit odds (30 days)0.3%top 80.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	open-webui	0.9.6	GHSA-4r4w-2wgp-w7cj
PyPI	open-webui	0.9.6	PYSEC-2026-2701

Affected products (as reported)

Vendor	Product	Versions
open-webui	open-webui	< 0.9.6

Weakness: CWE-284, CWE-639 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-4r4w-2wgp-w7cj x_refsource_CONFIRM