CVE-2025-10539

Improper TLS Certificate Validation RCE via Malicious Update in DeskTime Time Tracking App

MEDIUM
4.8
CVSS Score
Published: April 28, 2026 at 07:52 AM UTC
Updated: October 7, 2026 at 09:10 AM UTC
2 products affected across 2 vendorsDesktime Time TrackingDesktime Time Tracking

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Severity
MEDIUM4.8
Exploit prediction
EPSS 0.2%
SSVC
PoC

Description

Due to improper TLS certificate validation in the DeskTime Time Tracking App before version 1.3.674, attackers who can position themselves in the network path between the client and the DeskTime update servers can return a malicious executable in response to an update request. This allows the attacker to achieve user-level remote code execution on the affected client.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.3.674
Affected range stops below 1.3.674, so it looks safe — our inference, not a vendor statement
v < 1.3.674
Affected range stops below 1.3.674, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

Third Party Advisory
Source: cverecord
https://r.sec-consult.com/desktime
PatchProduct
Source: cverecord
https://desktime.com/download
ExploitMailing ListThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
http://seclists.org/fulldisclosure/2026/Apr/20
ExploitMailing ListThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
http://seclists.org/fulldisclosure/2026/Apr/21

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.8MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-295CWE-296CWE-494

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