CVE-2026-39424Network attack vector

Client-side code execution via unsanitized export formulas

Published Apr 14, 2026 · Updated Apr 14, 2026

CSV formula injection in FIT2CLOUD MaxKB 2.7.1 and earlier allows remote attackers to execute code through exported chat data. ApplicationChatQuerySerializers.reset_value removes only XML control characters before openpyxl writes chat strings to XLSX cells, leaving leading =, +, -, and @ formula markers intact. Exploitation requires an administrator to export and open a poisoned chat history in a spreadsheet that evaluates DDE formulas, placing code execution on that workstation.

CVSS severityUnavailable
Unscored
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

CSV formula injection in FIT2CLOUD MaxKB 2.7.1 and earlier allows remote attackers to execute code through exported chat data. ApplicationChatQuerySerializers.reset_value removes only XML control characters before openpyxl writes chat strings to XLSX cells, leaving leading =, +, -, and @ formula markers intact. Exploitation requires an administrator to export and open a poisoned chat history in a spreadsheet that evaluates DDE formulas, placing code execution on that workstation.

The record

CVE
CVE-2026-39424
Published
Apr 14, 2026
Updated
Apr 14, 2026
Vendor
KubeOperator
Product
MaxKB
Classifications
T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

KubeOperator · MaxKBversion=< 2.8.0

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo