4.3

CVE-2026-45387: open-webui

CVSS: 4.3v3.1MediumAnalyzed
AliasesGHSA-h2cw-7qw9-56xrPYSEC-2026-2728
Published 15-05-2026Last modified 15-05-2026
Open JSON

Vulnerability summary

CVE-2026-45387 is a medium (CVSS 4.3) vulnerability in open-webui. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 22.7% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
27/100
0100
Medium · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.31%
0%100%
Low · +0.09 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Timeline

  1. 15-05-2026
    PublishedVulnerability first disclosed.
  2. 15-05-2026
    Last modifiedVulnerability information updated.

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, when setting model permissions so that a group has read access to it, intending for other users to use it, those users also can read the model's system prompt. However users may consider their system prompt confidential, so this is considered a security issue. This vulnerability is fixed in 0.9.5.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.31%

Chance of exploitation in the next 30 days

Percentile

23%

Versus all other CVEs

30-day change

+0.09 pp

From 0.22% on 22-09-2026

22-09-202622-10-2026
EPSS score
0.31%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Open Webui

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Open-webui1 product
Openwebui1 product
PyPI1 product
  • open-webui< 0.9.5

3 vendors · 3 products

References

6 links