HighCVE-2025-64496

Open WebUI Affected by an External Model Server (Direct Connections) Code Injection via SSE Events (CVE-2025-64496)

Published 08.11.2025Sources: CVE.org, OSV

Public exploit

What is affected, what to do

An exploit is publicly available. Update Open-webui to version 0.6.35.

Affected: Open-webui lt *..0.6.35
Fixed in: Open-webui 0.6.35

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

8.0

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: NVD, CVSS v3

7.3

CVSS v3

Severity High on the scale from 0 to 10.

Source: CVE.org, OSV

7.2 %

EPSS score

Moderate — model estimates 1-10% exploitation likelihood.

Source: FIRST EPSS, percentile 94.3

Show all metrics

Severity: High
Priority (0–325) The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first? Read in glossary: 119.56 Methodology
Exploit maturity An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack. Read in glossary: PoC (publicly reported)
XIEM Effective CVSS XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command. Read in glossary: 8.0 Methodology
CVSS v3 CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions. Read in glossary: 7.3
EPSS score The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“. Read in glossary: 7.2 %; Moderate — model estimates 1-10% exploitation likelihood.
EPSS percentile The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking. Read in glossary: 94.3; Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
KEV status The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: —
Published: 08.11.2025
CISA assessment (SSVC): Exploitation: proof of concept · not automatable · Technical impact: total; Source: CISA Vulnrichment, as of 13 November 2025
CWE CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect. Read in glossary: CWE-95, CWE-829, CWE-830, CWE-501

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2 NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management. Read in glossary: High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates. Read in glossary: From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001 ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security. Read in glossary: Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Versions 0.6.224 and prior contain a code injection vulnerability in the Direct Connections feature that allows malicious external model servers to execute arbitrary JavaScript in victim browsers via Server-Sent Event (SSE) execute events. This leads to authentication token theft, complete account takeover, and when chained with the Functions API, enables remote code execution on the backend server. The attack requires the victim to enable Direct Connections (disabled by default) and add the attacker's malicious model URL, achievable through social engineering of the admin and subsequent users. This issue is fixed in version 0.6.35.

Source: NVD (NIST), OSV (Open Source Vulnerabilities), cvelistv5, CVE.org (MITRE)

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
open-webui	open-webui	`< 0.6.35`	`0.6.35`
openwebui	open_webui	`< 0.6.35`	`0.6.35`
npm	open-webui	`—`	—
pypi	open-webui	`0.6.29` `0.6.14` `0.3.17` `0.3.3` `0.6.33` `0.2.0` `0.6.22` `0.6.12` `0.6.4` `0.6.16` `0.3.34` `0.6.32` `0.6.0` `0.3.19` `0.1.124` `0.6.20` `0.6.11` `0.3.30.dev2` `0.4.3` `0.6.7` `0.6.8` `0.5.0` `0.3.16` `0.6.34` `0.5.0.dev2` `0.5.1` `0.3.27` `0.3.30` `0.5.8` `0.3.17.dev2` `0.3.35` `0.3.20` `0.6.6.dev1` `0.3.17.dev5` `0.2.4` `0.5.13` `0.6.23` `0.3.28` `0.6.24` `0.5.20` `0.6.25` `0.4.5` `0.4.4` `0.4.6` `0.5.17`	— — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — —

Vendors and products

Weakness classes (CWE)

CWE-95Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
Variant
The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes code syntax before using the input in a dynamic evaluation call (e.g. "eval").
Entry at MITRE CWE-95
CWE-829Inclusion of Functionality from Untrusted Control Sphere
Base
The product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere.
Entry at MITRE CWE-829
CWE-830Inclusion of Web Functionality from an Untrusted Source
Variant
The product includes web functionality (such as a web widget) from another domain, which causes it to operate within the domain of the product, potentially granting total access and control of the product to the untrusted source.
Entry at MITRE CWE-830
CWE-501Trust Boundary Violation
Base
The product mixes trusted and untrusted data in the same data structure or structured message.
Entry at MITRE CWE-501

Public exploit references

Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.

Public exploit references

Reference tagged as exploit	github.com (opens in a new tab)	PoC (publicly reported)reported, not verified	—

References & sources

github.comopen-webui/open-webui/security/advisories/GHSA-cm35-v4vp-5xvxweb, x_refsource_CONFIRM, Exploit, Third-party advisory
NVD (NIST)vuln/detail/CVE-2025-64496advisory
github.comopen-webui/open-webui/commit/8af6a4cf21b756a66cd58378a01c60f74c…web, x_refsource_MISC, Patch
github.comopen-webui/open-webuipackage

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