HOMEVULNERABILITIESCVE-2026-39424
MEDIUM

CVE-2026-39424

CWE-1236Published: April 14, 2026· Updated: Apr 20, 2026

4.7
CVSS v3.1
EPSS:0.06%probability of exploitation in 30 daysPercentile:18.9th

Official Description

MaxKB is an open-source AI assistant for enterprise. In versions 2.7.1 and below, the chat export feature is vulnerable to Improper Neutralization of Formula Elements in a CSV File. When an administrator exports the application chat history to an Excel file (.xlsx) via the /admin/api/workspace/{workspace_id}/application/{application_id}/chat/export endpoint, strings starting with formula characters are written directly without proper sanitization. Opening this file in spreadsheet applications like Microsoft Excel can lead to Arbitrary Code Execution (RCE) on the administrator's workstation via Dynamic Data Exchange (DDE). The issue is a variant of CVE-2025-4546, which fixed the exact same pattern in apps/dataset/serializers/document_serializers.py but missed the application chat export sink. This issue has been fixed in version 2.8.0.

NVD Source

Technical Analysis

CVE-2026-39424 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.High
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L

Affected Vendors & Products

maxkb1 product
maxkb
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://github.com/1Panel-dev/MaxKB/commit/24cd68acae5f726eed828e2ac801827a2a70536f
ADVISORYhttps://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-rr4r-7cj2-29vp

All References (3)

→
https://github.com/1Panel-dev/MaxKB/commit/24cd68acae5f726eed828e2ac801827a2a70536fPatch
→
https://github.com/1Panel-dev/MaxKB/releases/tag/v2.8.0Release Notes
→
https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-rr4r-7cj2-29vpVendor Advisory

Quick Facts

CVE IDCVE-2026-39424
CVSS Score4.7 / 10
SeverityMEDIUM
WeaknessCWE-1236
CISA KEVNo
EPSS (30d)0.06%
Affected1 vendor
PublishedApr 14, 2026

Related CVEs (CWE-1236)

CVE-2026-35157
9.8
CVE-2025-52612
8.8
CVE-2023-54348
8.8
CVE-2026-5242
8.8
CVE-2026-47693
6.9
CVE-2026-9673
6.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-39424 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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