CVE-2026-39423 | 1Panel-dev MaxKB up to 2.7.x AI Chat Interface cross site scripting (GHSA-462x-99gf-mp79)

VDB-357289 · CVE-2026-39423 · GHSA-462X-99GF-MP79 1PANEL-DEV MAXKB UP TO 2.7.X AI CHAT INTERFACE CROSS SITE SCRIPTING HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 3.4 $0-$5k 3.02 Summaryinfo A vulnerability identified as problematic has been detected in 1Panel-dev MaxKB up to 2.7.x. This impacts an unknown function of the component AI Chat Interface. This manipulation causes cross site scripting. The identification of this vulnerability is CVE-2026-39423. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component. Detailsinfo A vulnerability was found in 1Panel-dev MaxKB up to 2.7.x. It has been declared as problematic. Affected by this vulnerability is some unknown functionality of the component AI Chat Interface. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is: MaxKB is an open-source AI assistant for enterprise. Versions 2.7.1 and below contain an Eval Injection vulnerability in the Markdown rendering engine that allows any user capable of interacting with the AI chat interface to execute arbitrary JavaScript in the browsers of other users, including administrators, resulting in Stored Cross-Site Scripting (XSS). This issue has been fixed in version 2.8.0. The advisory is shared at github.com. This vulnerability is known as CVE-2026-39423 since 04/07/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue. Upgrading to version 2.8.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 34fb95bde9574c5b3a734ab00c7f29b9e7d32669 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version. Productinfo Vendor 1Panel-dev Name MaxKB Version 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 License open-source Website Product: https://github.com/1Panel-dev/MaxKB/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 3.5 VulDB Meta Temp Score: 3.4 VulDB Base Score: 3.5 VulDB Temp Score: 3.4 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Cross site scripting CWE: CWE-79 / CWE-94 / CWE-74 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: MaxKB 2.8.0 Patch: 34fb95bde9574c5b3a734ab00c7f29b9e7d32669 Timelineinfo 04/07/2026 CVE reserved 04/14/2026 +7 days Advisory disclosed 04/14/2026 +0 days VulDB entry created 04/14/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-462x-99gf-mp79 Status: Confirmed CVE: CVE-2026-39423 (🔒) GCVE (CVE): GCVE-0-2026-39423 GCVE (VulDB): GCVE-100-357289 Entryinfo Created: 04/14/2026 08:08 Changes: 04/14/2026 08:08 (71) Complete: 🔍 Cache ID: 99:29F:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸