CVE-2026-39422: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in 1Panel-dev MaxKB
MaxKB versions 2. 7. 1 and below contain a stored Cross-Site Scripting (XSS) vulnerability in the application name and icon fields. This vulnerability allows an attacker to inject arbitrary JavaScript that executes when a user visits the public chat interface. The issue arises because the application inserts unescaped user input directly into the HTML response. This vulnerability has been fixed in version 2. 8. 0. The CVSS 4. 0 score is 6.
AI Analysis
Technical Summary
CVE-2026-39422 is a stored Cross-Site Scripting (CWE-79) vulnerability affecting MaxKB, an open-source AI assistant for enterprise by 1Panel-dev. Versions prior to 2.8.0 allow attackers to inject malicious JavaScript via the application name or icon fields during application creation. The injected script executes in the context of the victim's browser when accessing the public chat interface (/ui/chat/{access_token}), due to unescaped insertion of these fields into the HTML response by ChatHeadersMiddleware. This vulnerability enables execution of arbitrary scripts, potentially compromising user sessions or data. The issue is resolved in MaxKB version 2.8.0.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary JavaScript in the victim's browser context when visiting the public chat interface, potentially leading to session hijacking, data theft, or other malicious actions within the scope of the user's browser session. The vulnerability is rated medium severity with a CVSS 4.0 score of 6.9. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade MaxKB to version 2.8.0 or later, where this stored XSS vulnerability has been fixed. No other mitigation is required as the vendor has addressed the issue in the official release. Patch status is confirmed by the vendor advisory stating the fix is included in version 2.8.0.
CVE-2026-39422: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in 1Panel-dev MaxKB
Description
MaxKB versions 2. 7. 1 and below contain a stored Cross-Site Scripting (XSS) vulnerability in the application name and icon fields. This vulnerability allows an attacker to inject arbitrary JavaScript that executes when a user visits the public chat interface. The issue arises because the application inserts unescaped user input directly into the HTML response. This vulnerability has been fixed in version 2. 8. 0. The CVSS 4. 0 score is 6.
CVSS v4.0
Score 6.9medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-39422 is a stored Cross-Site Scripting (CWE-79) vulnerability affecting MaxKB, an open-source AI assistant for enterprise by 1Panel-dev. Versions prior to 2.8.0 allow attackers to inject malicious JavaScript via the application name or icon fields during application creation. The injected script executes in the context of the victim's browser when accessing the public chat interface (/ui/chat/{access_token}), due to unescaped insertion of these fields into the HTML response by ChatHeadersMiddleware. This vulnerability enables execution of arbitrary scripts, potentially compromising user sessions or data. The issue is resolved in MaxKB version 2.8.0.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary JavaScript in the victim's browser context when visiting the public chat interface, potentially leading to session hijacking, data theft, or other malicious actions within the scope of the user's browser session. The vulnerability is rated medium severity with a CVSS 4.0 score of 6.9. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade MaxKB to version 2.8.0 or later, where this stored XSS vulnerability has been fixed. No other mitigation is required as the vendor has addressed the issue in the official release. Patch status is confirmed by the vendor advisory stating the fix is included in version 2.8.0.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-07T00:23:30.595Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69dd958882d89c981f9c582a
Added to database: 4/14/2026, 1:16:56 AM
Last enriched: 4/21/2026, 6:27:07 AM
Last updated: 5/29/2026, 2:47:00 AM
Views: 78
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.