---
id: "CVE-2026-44977"
kind: "vulnerability"
aliases: ["CVE-2026-44977"]
title: "countly-server is the server-side part of Countly, a product analytics solution"
severity: "critical"
cvss: 9.0
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["countly", "package", "product-analytics", "self-hosted"]
not_affected_if: ["fixed-version", "star-rating-plugin-disabled"]
published_at: "2026-10-16T16:17:44+00:00"
first_seen_at: "2026-10-23T21:57:13+00:00"
updated_at: "2026-10-23T22:28:55+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44977", "first_seen_at": "2026-10-23T21:57:13+00:00"}]
---

# countly-server is the server-side part of Countly, a product analytics solution

Countly server's star-rating plugin lets a non-global application admin upload a file that is later served with an attacker-chosen Content-Type. When a global admin opens the preview, the payload runs in the Countly origin and can read auth_token and csrf_token values.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

Check the installed countly-server version (fixed in 24.05.50 and 25.03.44). Check whether the star-rating plugin is enabled and whether feedback/preview/ serves uploaded files.

## Fix

Upgrade countly-server to 24.05.50 or 25.03.44 or later.
Until then, disable the star-rating plugin or restrict who can open feedback previews.

## Timeline

- 2026-10-23T21:57:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-44977

## From the sources

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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_