CVE-2025-65959Public exploitNetwork attack vector

Session-token theft via unsanitized note HTML

Published Dec 4, 2025 · Updated Dec 5, 2025

Stored XSS in Open WebUI before 0.6.37 allows remote attackers to steal session tokens through malicious Markdown note imports. The downloadPdf function in src/lib/components/notes/utils.ts assigns stored note HTML to a DOM node without sanitization, so SVG event handlers execute during PDF generation. Exploitation requires a victim to import the crafted file and download that note as a PDF; successful script execution can read the victim's browser-stored session token.

CVSS severity8.7
High
EPSS probability0.24%
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 0.6.37 allows remote attackers to steal session tokens through malicious Markdown note imports. The downloadPdf function in src/lib/components/notes/utils.ts assigns stored note HTML to a DOM node without sanitization, so SVG event handlers execute during PDF generation. Exploitation requires a victim to import the crafted file and download that note as a PDF; successful script execution can read the victim's browser-stored session token.

The record

CVE
CVE-2025-65959
Published
Dec 4, 2025
Updated
Dec 5, 2025
Vendor
Open WebUI
Product
Open WebUI
Classifications
CWE-79, T1204.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 5, 2025Record 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=< 0.6.37

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open WebUI · Open WebUIversion=< 0.6.37

Published CVSS scores

8.7GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.002User Execution: Malicious File

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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