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CVE-2026-53902

HIGH
7.1
CVSS 4.0
Description
MCO does not properly enforce authorization checks in the /customer/servlet/mco/webapi/profile-sections/group-membership endpoint. An authenticated user can modify their group membership without proper authorization checks, allowing privilege escalation. An attacker can add themselves to arbitrary groups by supplying a valid group ID, which can be obtained via other application functionalities (e.g. /customer/servlet/mco/webapi/group/picker/groups), provided he has necessary permissions, or potentially inferred through brute-force techniques. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 25.3.3.1 but may also affect other versions.

Metadata

CVE ID
CVE-2026-53902
State
PUBLISHED
Assigner
CERT-PL
Reserved
2026-06-11 07:44 UTC
Published
2026-07-01 11:58 UTC
Last updated
2026-07-01 13:42 UTC
Primary CWE
CWE-266
CWE-266 Incorrect Privilege Assignment
Vendor / Product
MyComplianceOffice / MCO
Sources
cve.org  ·  NVD

Severity & Metrics

7.1 HIGH CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
MyComplianceOffice MCO — 25.3.3.1
Weakness (CWE)
CWESourceDescription
CWE-266 cna CWE-266 Incorrect Privilege Assignment
CWE-863 cna CWE-863 Incorrect Authorization
CVSS scores (1)
ScoreSeverityVersionSourceVector
7.1 HIGH 4.0 cna CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
References (2)
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