CVE-2026-39423: 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 due to improper input neutralization in the Markdown rendering engine. This vulnerability allows any user who can interact with the AI chat interface to execute arbitrary JavaScript in other users' browsers, including administrators. The issue is fixed in version 2. 8. 0. The CVSS 4. 0 base score is 6. 9, indicating a medium severity level.
AI Analysis
Technical Summary
CVE-2026-39423 is a stored cross-site scripting (XSS) vulnerability in MaxKB, an open-source AI assistant for enterprise, affecting versions prior to 2.8.0. The vulnerability arises from an Eval Injection flaw in the Markdown rendering engine, which allows an attacker with chat interface access to inject and execute arbitrary JavaScript code in the browsers of other users, including privileged administrators. This can lead to unauthorized script execution within the context of the affected application. The vulnerability has been addressed and fixed in MaxKB version 2.8.0.
Potential Impact
Successful exploitation enables an attacker to execute arbitrary JavaScript in the browsers of other users, potentially leading to session hijacking, unauthorized actions, or data exposure within the MaxKB application. Since administrators can be targeted, the impact includes elevated risk to application integrity and confidentiality. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade MaxKB to version 2.8.0 or later, where this vulnerability has been fixed. No other official remediation or temporary fixes are documented. Patch status is confirmed by the vendor's versioning information.
CVE-2026-39423: 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 due to improper input neutralization in the Markdown rendering engine. This vulnerability allows any user who can interact with the AI chat interface to execute arbitrary JavaScript in other users' browsers, including administrators. The issue is fixed in version 2. 8. 0. The CVSS 4. 0 base score is 6. 9, indicating a medium severity level.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-39423 is a stored cross-site scripting (XSS) vulnerability in MaxKB, an open-source AI assistant for enterprise, affecting versions prior to 2.8.0. The vulnerability arises from an Eval Injection flaw in the Markdown rendering engine, which allows an attacker with chat interface access to inject and execute arbitrary JavaScript code in the browsers of other users, including privileged administrators. This can lead to unauthorized script execution within the context of the affected application. The vulnerability has been addressed and fixed in MaxKB version 2.8.0.
Potential Impact
Successful exploitation enables an attacker to execute arbitrary JavaScript in the browsers of other users, potentially leading to session hijacking, unauthorized actions, or data exposure within the MaxKB application. Since administrators can be targeted, the impact includes elevated risk to application integrity and confidentiality. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade MaxKB to version 2.8.0 or later, where this vulnerability has been fixed. No other official remediation or temporary fixes are documented. Patch status is confirmed by the vendor's versioning information.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-07T00:23:30.596Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69dd958882d89c981f9c582f
Added to database: 4/14/2026, 1:16:56 AM
Last enriched: 4/14/2026, 1:32:02 AM
Last updated: 4/14/2026, 4:41:41 AM
Views: 6
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