{"id":"CVE-2026-44977","aliases":["EUVD-2026-102918","GHSA-jqp4-p86c-phxc"],"status":"published","title":"countly-server: Stored XSS in feedback upload enables app-admin to compromise global admin session context","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.","severity":{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00436,"percentile":0.38185,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2026-10-16T16:04:45Z","modified":"2026-10-28T02:30:56Z","products":[{"vendor":"countly","product":"countly-server"}],"references":[{"url":"https://github.com/Countly/countly-server/security/advisories/GHSA-jqp4-p86c-phxc","tags":["x_refsource_CONFIRM","exploit","advisory"]},{"url":"https://github.com/Countly/countly-server/commit/ae899f37bc6d70c1b44859756ce80a204ae72631","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/Countly/countly-server/commit/fcb16c808c0fdb6dc99fe9c66de7fc560b3a9c41","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/Countly/countly-server/releases/tag/24.05.50","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/Countly/countly-server/releases/tag/25.03.44","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44977.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44977","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-44977","title":"countly-server: Stored XSS in feedback upload enables app-admin to compromise global admin session context","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.","status":"published","published":"2026-10-16T16:04:45.868Z","modified":"2026-10-21T02:24:31.741Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T13:42:49.132798Z"}],"euvd":[{"id":"EUVD-2026-102918","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.","status":"published","published":"2026-10-16T16:04:45Z","modified":"2026-10-21T02:24:31Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T16:59:40.989797Z"}],"nvd":[{"id":"CVE-2026-44977","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.","status":"published","published":"2026-10-16T16:17:44.483Z","modified":"2026-10-21T03:17:19.33Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:13:00.123071Z"}],"osv":[{"id":"CVE-2026-44977","title":"countly-server: Stored XSS in feedback upload enables app-admin to compromise global admin session context","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.","status":"published","published":"2026-10-16T16:04:45.868Z","modified":"2026-10-28T02:30:56.511598195Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:45:05.172514Z"}]}}