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CVE-2026-44977— countly-server: Stored XSS in feedback upload enables app-admin to compromise global admin session context

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-server 是 Countly（一款产品分析解决方案）的服务器端组件。在版本 24.05.50 和 25.03.44 之前，插件 允许非全局应用管理员调用 接口，利用该接口存储由攻击者控制的活跃内容，同时信任攻击者提供的 MIME 类型。随后， 会通过 路径公开提供这些已存储的内容，并沿用攻击者指定的 Content-Type。当全局管理员打开该预览页面时，攻击载荷将在 Countly 的源站上下文中执行，从而暴露已认证会话的相关能力，包括 和 等敏感值。该问题已在版本 24.05.50 和 25

CVSS 9.0 · Critical EPSS 0.34% · P26

Affected Version Matrix 2

VendorProduct Version RangeStatus
Countly countly-server < 24.05.50 affected
>= 25.03, < 25.03.44 affected
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I. Basic Information for CVE-2026-44977

Vulnerability Information
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Vulnerability Title
countly-server: Stored XSS in feedback upload enables app-admin to compromise global admin session context
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Countly countly-server < 24.05.50 -

II. Public POCs for CVE-2026-44977

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III. Intelligence Information for CVE-2026-44977

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Patches & Fixes for CVE-2026-44977 (2)

Vendor Advisories for CVE-2026-44977 (1)

Vendor Pages for CVE-2026-44977 (2)

Same Patch Batch · Countly · 2026-10-16 · 4 CVEs total

CVE-2026-42269 8.1 HIGH countly-server: Path Traversal in delete_import Endpoint Allows Arbitrary File and Directo
CVE-2026-42270 7.5 HIGH countly-server: Unauthenticated Denial of Service (DoS) via Unhandled Stream Exception
CVE-2026-41582 7.5 HIGH countly-server: Unauthenticated Path Traversal via Public Image and Screenshot Routes Lead

IV. Related Vulnerabilities

Same product: countly-server
Same vendor: Countly
Same weakness: CWE-79

V. Comments for CVE-2026-44977

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