CVE-2026-87803 - Countly Server DBViewer Authorization Bypass

CVE-2026-87803 - Countly Server DBViewer Authorization Bypass

https://cvefeed.io/rssfeed/latest.atom / Thu, 09/10/2026 - 13:31
CVE ID :CVE-2026-87803
Published : Sept. 10, 2026, 10:17 a.m. | 48 minutes ago
Description :An authorization bypass vulnerability exists in the Countly Server DBViewer due to flawed sub-pipeline detection in the aggregation stage sanitizer. The /o/db aggregation endpoint parses user-controlled aggregation JSON and passes it through a stage sanitizer that determines whether a nested array is a sub-pipeline by checking if every element contains a key present in a hardcoded KNOWN_STAGE_OPERATORS set. If any element contains an unrecognized stage key, such as the undocumented MongoDB-internal $_internalInhibitOptimization, the sanitizer misclassifies the entire branch as a generic array and skips stage-level stripping for all sibling stages. This allows a non-admin user with DBViewer read permission to inject forbidden operators like $lookup inside $facet sub-pipelines, performing cross-collection joins into restricted collections. This leads to unauthorized read access to sensitive data including password-reset tokens (prid), enabling account takeover.
Severity: 7.1 | HIGH
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