{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-39422", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-07T00:23:30.595Z", "datePublished": "2026-04-14T00:22:50.958Z", "dateUpdated": "2026-04-14T13:32:41.804Z"}, "containers": {"cna": {"title": "MaxKB has Stored XSS via ChatHeadersMiddleware", "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 6.9, "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-wf7p-3jq5-q52w", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-wf7p-3jq5-q52w"}, {"name": "https://github.com/1Panel-dev/MaxKB/commit/026a2d623e2aa5efa67c4834651e79d5d7cab1da", "tags": ["x_refsource_MISC"], "url": "https://github.com/1Panel-dev/MaxKB/commit/026a2d623e2aa5efa67c4834651e79d5d7cab1da"}, {"name": "https://github.com/1Panel-dev/MaxKB/releases/tag/v2.8.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/1Panel-dev/MaxKB/releases/tag/v2.8.0"}], "affected": [{"vendor": "1Panel-dev", "product": "MaxKB", "versions": [{"version": "< 2.8.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-14T00:22:50.958Z"}, "descriptions": [{"lang": "en", "value": "MaxKB is an open-source AI assistant for enterprise. Versions 2.7.1 and below contain a Stored Cross-Site Scripting (XSS) vulnerability through the application name or icon fields when creating an application. When a victim visits the public chat interface (/ui/chat/{access_token}), the ChatHeadersMiddleware retrieves the application data and directly inserts the unescaped application name and icon into the HTML response via string replacement. This allows an attacker to execute arbitrary JavaScript in the victim's browser context. This issue has been fixed in version 2.8.0."}], "source": {"advisory": "GHSA-wf7p-3jq5-q52w", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-wf7p-3jq5-q52w", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-14T13:32:38.264425Z", "id": "CVE-2026-39422", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-14T13:32:41.804Z"}}]}}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.8.0)"}}], "enrichment": {"confidence": 86.0, "confidence_source": "matching", "scores": [{"score": 86.0, "source": "matching"}]}, "original": {"product": "MaxKB", "source": "cna", "vendor": "1Panel-dev"}, "product": "maxkb", "vendor": "1panel"}], "analysis": {"en": {"generated_at": "2026-04-14T02:21:14.498312+00:00", "value": {"mitigation_remediation": ["Upgrade MaxKB to version 2.8.0 or later.", "Remove or sanitize existing application entries that contain malicious name or icon fields.", "Ensure future deployments validate and escape user input for application metadata."], "summary": {"action": "Immediate Patch", "impact": "Stored Cross\u2011Site Scripting enabling arbitrary JavaScript execution in users' browsers."}, "threat_synthesis": {"affected_systems": "The issue affects the 1Panel\u2011dev MaxKB platform, specifically all releases version 2.7.1 and earlier. Version 2.8.0 releases the fix that properly escapes these fields.", "description_and_impact": "A stored cross\u2011site scripting vulnerability allows an attacker to embed malicious JavaScript into the application name or icon fields when creating an application. The ChatHeadersMiddleware then retrieves this data and inserts it unescaped into the public chat page, causing the script to run in any visitor\u2019s browser. The weakness is classified as CWE\u201179 and can lead to session hijacking, data theft, and defacement of the web interface.", "risk_and_exploitability": "The CVSS score of 6.9 indicates moderate severity. Exploitation requires the attacker to create or modify an application with malicious fields, and relies on a victim visiting the public chat URL with an access token. Because the vulnerability is stored and can be reused, any user who accesses the chat interface is at risk. No EPSS data is available, and the vulnerability is not listed in the CISA KEV catalog, indicating no widespread exploitation yet."}}}}, "created": "2026-04-14T16:16:15.095817+00:00", "updated": "2026-04-14T16:31:11.503372+00:00", "vendors": ["1panel", "1panel$PRODUCT$maxkb"]}