EUVD-2026-22193Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
7DescriptionGitHub Advisory
MaxKB is an open-source AI assistant for enterprise. Versions 2.7.1 and below contain a Stored Cross-Site Scripting (XSS) vulnerability where the frontend's MdRenderer.vue component parses custom <iframe_render> tags from LLM responses or Application Prologue configurations, bypassing standard Markdown sanitization and XSS filtering. The unsanitized HTML content is passed to the IframeRender.vue component, which renders it directly into an <iframe> via the srcdoc attribute configured with sandbox="allow-scripts allow-same-origin". This can be a dangerous combination, allowing injected scripts to escape the iframe and execute JavaScript in the parent window using window.parent. Since the Prologue is rendered for any user visiting an application's chat interface, this results in a high-impact Stored XSS that can lead to session hijacking, unauthorized actions, and sensitive data exposure. This issue has been fixed in version 2.8.0.
AnalysisAI
Stored Cross-Site Scripting in MaxKB's MdRenderer component allows authenticated users to inject malicious scripts via custom <iframe_render> tags in LLM responses or Application Prologue configurations, leading to JavaScript execution in the parent window context with access to session tokens and sensitive data. MaxKB versions 2.7.1 and earlier are affected; the vulnerability is fixed in version 2.8.0. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Risk Assessment | Despite the moderate CVSS 5.1 score, this vulnerability carries elevated real-world risk due to multiple amplifying factors. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated user (such as an application administrator or content contributor) crafts a malicious Application Prologue configuration containing a <iframe_render> tag with injected JavaScript, such as a script that exfiltrates session cookies or redirects to a phishing site. When any user visits the chat interface to interact with the MaxKB application, the stored payload executes automatically in their browser context, stealing their session token or performing actions on their behalf without visible indication. … |
| Remediation | Vendor-released patch: MaxKB version 2.8.0 fixes the XSS vulnerability; upgrade all affected instances immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
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