CVE-2026-44977
CriticalCVSS 9.0Exploitation Probability (EPSS)
Low risk26th percentile - higher than 26% of all known CVEs
Summary
countly-server is the server-side part of Countly, a product analytics solution. Prior to 24.05.50 and 25.03.44, plugins/star-rating/api/api.js allows a non-global application administrator to use uploadFeedbackFile to store attacker-controlled active content while trusting the supplied MIME type. plugins/star-rating/frontend/app.js publicly serves the stored content from feedback/preview/ with the attacker-influenced Content-Type, so a global administrator who opens the preview executes the payload in the Countly origin and exposes authenticated session capabilities, including auth_token and csrf_token values.
Risk Assessment
The vulnerability enables stored XSS that, when a global administrator opens the preview, can expose session tokens (auth_token, csrf_token) and allow account takeover. Countly installations prior to 24.05.50 and 25.03.44 are exposed.
Recommendation
Update countly-server to version 24.05.50 or 25.03.44 (or later). Until patched, restrict file uploads by application administrators and avoid opening untrusted feedback previews.
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Original NVD description (English source)
countly-server is the server-side part of Countly, a product analytics solution. Prior to 24.05.50 and 25.03.44, plugins/star-rating/api/api.js allows a non-global application administrator to use uploadFeedbackFile to store attacker-controlled active content while trusting the supplied MIME type. plugins/star-rating/frontend/app.js publicly serves the stored content from feedback/preview/ with the attacker-influenced Content-Type, so a global administrator who opens the preview executes the payload in the Countly origin and exposes authenticated session capabilities, including auth_token and csrf_token values. This issue is fixed in versions 24.05.50 and 25.03.44.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

