PT-2026-54828 · Mco · Mco

Hubert Decyusz · Published 2026-07-01 · Updated 2026-07-02 · CVE-2026-53902

Positive Technologies (AI Summary)

CVSS v4.0

7.1

High

Base vector

AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions MCO version 25.3.3.1

Description Insufficient authorization enforcement in the '/customer/servlet/mco/webapi/profile-sections/group-membership' endpoint allows an authenticated user to modify their group membership. By providing a valid group ID, which may be obtained through the '/customer/servlet/mco/webapi/group/picker/groups' endpoint or via brute-force, an attacker can add themselves to arbitrary groups, leading to privilege escalation.

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

LPE

Incorrect Privilege Assignment

Incorrect Authorization

Weakness Enumeration

CWE-266

CWE-863

Related Identifiers

CVE-2026-53902

Affected Products

Mco

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-53902 · Security Note
• https://cert.pl/en/posts/2026/07/CVE-2026-53902 · Note
• https://mco.mycomplianceoffice.com · Note
• https://twitter.com/infoflowcloud/status/2072325873533854046 · Twitter Post
• https://twitter.com/TuringCyberObs/status/2072617033452097689 · Twitter Post
• https://twitter.com/CVEnew/status/2072324853516918979 · Twitter Post