9

CVE-2026-59214: open-webui Cross-site Scripting

CVSS: 9.0v3.1CriticalAnalyzed
AliasesGHSA-4r2p-27mh-5m22PYSEC-2026-3590
Published 09-07-2026Last modified 09-07-2026
Open JSON

Vulnerability summary

CVE-2026-59214 is a critical (CVSS 9.0) Cross-site Scripting vulnerability in open-webui. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 35.5% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.0/10
010
Critical · v3.1 (NVD)
EPSS score
0.42%
0%100%
Low · +0.14 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 09-07-2026
    PublishedVulnerability first disclosed.
  2. 09-07-2026
    Last modifiedVulnerability information updated.

Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, Open WebUI runs client-side Python with Pyodide in a same-origin web worker, allowing stored chat payloads that use pyodide.http.pyfetch or the js module fetch and XMLHttpRequest APIs to issue authenticated same-origin requests when a victim clicks Run, which can reach admin-only endpoints and execute server-side code through configured tools. This issue is fixed in version 0.10.0.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.42%

Chance of exploitation in the next 30 days

Percentile

36%

Versus all other CVEs

30-day change

+0.14 pp

From 0.29% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.42%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Open-webui1 product
Openwebui1 product
PyPI1 product
  • open-webui< 0.10.0

3 vendors · 3 products

References

5 links