PT-2026-54835 · Mco · Mco

Hubert Decyusz · Published 2026-07-01 · Updated 2026-07-01 · CVE-2026-53909

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Name of the Vulnerable Software and Affected Versions MCO version 25.3.3.1

Description The software fails to correctly validate the types of uploaded files because the validation process relies exclusively on client-side checks, which can be bypassed. This allows an authorized, low-privileged attacker to upload files of arbitrary types to the server.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Unrestricted File Upload

Weakness Enumeration

CWE-434

Related Identifiers

CVE-2026-53909

Affected Products

Mco

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-53909 · Security Note
• https://twitter.com/infoflowcloud/status/2072325799257014370 · Twitter Post
• https://mco.mycomplianceoffice.com · Note
• https://t.me/cveNotify/183677 · Telegram Post
• https://cert.pl/en/posts/2026/07/CVE-2026-53902 · Note
• https://twitter.com/CVEnew/status/2072324842649423909 · Twitter Post