CVE-2026-44977
countly-server: Stored XSS in feedback upload enables app-admin to compromise global admin session context
- State
- Published
- Severity
- 9.0 Critical
- Published
- Oct 16, 2026
- Updated
- Oct 21, 2026
- Reserved
- May 8, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.0 Critical | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H | GitHub_M |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
countly-serverCountly |
|
References
- 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
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