EUVD Vulnerability Catalog
EUVD-2026-102918
Severity: CRITICAL
Base Score: 9
CVSS Version: 3.1
Vulnerability Description
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.
CVSS Vector Analysis
Below is the complete, human-readable breakdown of the CVSS metric string: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
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Attack Vector (AV): Network
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Attack Complexity (AC): Low
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Privileges Required (PR): Low
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User Interaction (UI): Required
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Scope (S): Changed
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Confidentiality Impact (C): High
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Integrity Impact (I): High
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Availability Impact (A): High
Affected Vendors & Systems
Vendor
Countly
References & Advisory Links
- https://github.com/Countly/countly-server/security/advisories/GHSA-jqp4-p86c-phxc
- https://github.com/Countly/countly-server/commit/ae899f37bc6d70c1b44859756ce80a204ae72631
- https://github.com/Countly/countly-server/commit/fcb16c808c0fdb6dc99fe9c66de7fc560b3a9c41
- https://github.com/Countly/countly-server/releases/tag/24.05.50
- https://github.com/Countly/countly-server/releases/tag/25.03.44
Metadata Profile
Database Authority
European Union Agency for Cybersecurity (ENISA) EUVD
Assigner
GitHub_M
EPSS Probability
0.34
Known Aliases
CVE-2026-44977
Published On
2026-10-16
Last Updated
2026-10-21