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VulnerabilityPublished Updated

CVE-2026-39424: 1Panel-dev MaxKB · CSV Injection

Affects 1Panel-dev MaxKBSource CVE Database V5

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Mentioned vulnerabilities

Not known to be exploited · CVSS 5.3 Medium : upgrade to 2.8.0 when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 4.0 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 30% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 2.8.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 14 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade MaxKB and 1panel-dev/MaxKB to 2.8.0.

Affected software

ProductAffectedFixed in
1Panel-devMaxKBAffected
  • <2.8.0
Fixed in
  • 2.8.0
GitHub1panel-dev/MaxKBpkg:github/1panel-dev/MaxKBOther threatsAffected
  • <2.8.0
Fixed in
  • 2.8.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

This vulnerability is fixed in MaxKB version 2.8.0. Administrators should upgrade to version 2.8.0 or later to remediate this issue. Until the upgrade is applied, avoid exporting chat histories to Excel files or ensure that exported files are opened in spreadsheet applications with DDE and formula execution disabled. Patch status is not explicitly stated in the vendor advisory, but the fix is included in version 2.8.0 as per the description.

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.

References

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