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CVE-2026-87803

Quick assessment

Affected
Countly countly-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Countly 服务器中的 DBViewer 组件存在一个授权绕过漏洞，其根源在于聚合阶段净化器中对于子管道（sub-pipeline）的检测机制存在缺陷。 聚合端点会解析由用户控制的聚合 JSON，并将其通过一个阶段净化器进行处理。该净化器通过检查嵌套数组中的每个元素是否包含在硬编码的 集合中存在的键，来判断该嵌套数组是否为一个子管道。如果数组中任意一个元素包含无法识别的阶段键（例如未文档化的 MongoDB 内部操作符 ），净化器就会错误地将整个分支归类为普通通用数组，从而跳过对所有同级阶段的阶段级剥离处理。

CVSS 7.1 · High

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-87803

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Countly countly-server 0 ~ 25.03.53-LTS -

II. Public POCs for CVE-2026-87803

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III. Intelligence Information for CVE-2026-87803

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Patches & Fixes for CVE-2026-87803 (1)

IV. Related Vulnerabilities

Same product: countly-server
Same vendor: Countly
Same weakness: CWE-863

V. Comments for CVE-2026-87803

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