CVE-2026-56398Public exploitNetwork attack vector

Account takeover via OAuth profile SVG injection

Published Jul 15, 2026 · Updated Jul 15, 2026

Stored XSS in Open WebUI before 0.9.5 allows remote authenticated users to take over accounts through crafted OAuth profile images. The OAuth picture processor infers MIME type from the URL extension, bypasses the profile-image allowlist, and stores SVG content that the image endpoint serves inline. OAuth picture synchronization, control of an identity-provider picture URL, and victim navigation to the image are required; executed script can read the victim's stored token.

CVSS severity8.5
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Open WebUI before 0.9.5 allows remote authenticated users to take over accounts through crafted OAuth profile images. The OAuth picture processor infers MIME type from the URL extension, bypasses the profile-image allowlist, and stores SVG content that the image endpoint serves inline. OAuth picture synchronization, control of an identity-provider picture URL, and victim navigation to the image are required; executed script can read the victim's stored token.

The record

CVE
CVE-2026-56398
Published
Jul 15, 2026
Updated
Jul 15, 2026
Vendor
Open WebUI
Product
Open WebUI
Classifications
CWE-20, CWE-79, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.9.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open WebUI · Open WebUIversion=0 <0.9.5

Published CVSS scores

7.3Open WebUICVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
8.5National Vulnerability DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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