CVE-2026-87803 Countly Server - Authorization Bypass

Countly Server DBViewer contains an authorization bypass caused by flawed sub-pipeline detection in the aggregation stage sanitizer, letting non-admin users with read permission perform unauthorized cross-collection joins and access sensitive data, exploit requires DBViewer read permission.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.31% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authorization Bypass
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Published
10 September 2026
Updated
15 October 2026
Weakness
CWE-863

Vendor fix

Update to the latest version with fixed aggregation stage sanitizer.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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