CVE-2025-10539Public exploitNetwork attack vector

User-level code execution via untrusted update certificate

Published Apr 28, 2026 · Updated Apr 29, 2026

Improper certificate validation in DeskTime Time Tracking App before 1.3.674 allows man-in-the-middle attackers to execute user-level code. Its updater accepts a hostname-matching certificate when the certificate chain has errors, then downloads and automatically installs a higher-version executable. A network-path position is required; the hourly update check needs no user interaction and runs the payload with the current user's privileges.

CVSS severity4.8
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in DeskTime Time Tracking App before 1.3.674 allows man-in-the-middle attackers to execute user-level code. Its updater accepts a hostname-matching certificate when the certificate chain has errors, then downloads and automatically installs a higher-version executable. A network-path position is required; the hourly update check needs no user interaction and runs the payload with the current user's privileges.

The record

CVE
CVE-2025-10539
Published
Apr 28, 2026
Updated
Apr 29, 2026
Vendor
DeskTime
Product
DeskTime
Classifications
CWE-296, CWE-494, CWE-295, CAPEC-187, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 29, 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=0 <1.3.674

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

DeskTime · DeskTimeversion=0 <1.3.674

Published CVSS scores

4.8CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

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 exploitPublished

Weakness, pattern, technique

CWE-296Improper Following of a Certificate's Chain of Trust
CWE-494Download of Code Without Integrity Check
CWE-295Improper Certificate Validation
CAPEC-187Malicious Automated Software Update via Redirection
T1557Adversary-in-the-Middle

Public exploit references

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

Technologies

Your stack

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Your stack

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