---
id: "CVE-2026-87099"
kind: "vulnerability"
aliases: ["CVE-2026-87099"]
title: "Acronis Cyber Protect 17: cross-site scripting via improper input validation"
severity: "medium"
cvss: 5.7
epss: null
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["acronis", "cyber-protect", "linux", "vendor", "windows"]
not_affected_if: ["build-42587-or-later"]
published_at: "2026-10-28T11:17:27+00:00"
first_seen_at: "2026-10-28T11:32:33+00:00"
updated_at: "2026-10-28T11:33:32+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-87099", "first_seen_at": "2026-10-28T11:32:33+00:00"}]
---

# Acronis Cyber Protect 17: cross-site scripting via improper input validation

Acronis Cyber Protect 17 on Linux and Windows does not properly validate some input, which allows cross-site scripting. An attacker who gets a victim to load a crafted page or link could run script in the victim's browser session within the product.

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

## How to check

- Check the installed Acronis Cyber Protect 17 build number in the product's about or version screen; unknown whether the sources give a specific location.

## Fix

- Update Acronis Cyber Protect 17 to build `42587` or later on Linux and Windows.

## Timeline

- 2026-10-28T11:32:33+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-87099

## From the sources

Cross-site scripting (XSS) vulnerability due to improper input validation. The following products are affected: Acronis Cyber Protect 17 (Linux, Windows) before build 42587.

---

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