---
id: CVE-2026-121451
title: >-
  AB Download Manager before 1.11.2 Arbitrary File Write via
  /start-headless-download CSRF
summary: >-
  AB Download Manager before 1.11.2 contains a cross-site request forgery
  vulnerability in its unauthenticated browser-integration API that allows
  remote attackers to write attacker-chosen files to arbitrary paths. A
  malicious web page can…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-352
vendor: amir1376
product: ab-download-manager
affected:
  - ab-download-manager < 1.11.2
published: '2026-11-03'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T15:17:01.146Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121451'
references:
  - url: 'https://github.com/amir1376/ab-download-manager/issues/1489'
    label: 'GitHub Issue #1489'
  - url: 'https://github.com/amir1376/ab-download-manager'
  - url: >-
      https://github.com/amir1376/ab-download-manager/commit/34cd27af6a9a6c2046af112bc9bd34828fec0bbc
    label: Fix commit
  - url: >-
      https://github.com/amir1376/ab-download-manager/blob/v1.11.1/integration/server/src/main/kotlin/com/abdownloadmanager/integration/Endpoints.kt#L27-L75
  - url: >-
      https://github.com/amir1376/ab-download-manager/blob/v1.11.1/desktop/app/src/main/kotlin/com/abdownloadmanager/desktop/integration/IntegrationHandlerImp.kt#L55-L88
  - url: >-
      https://www.vulncheck.com/advisories/ab-download-manager-before-1.11.2-arbitrary-file-write-via-start-headless-download-csrf
    label: >-
      VulnCheck Advisory: AB Download Manager before 1.11.2 Arbitrary File Write
      via /start-headless-download CSRF
tags:
  - cve.org
epss: 0.0029
epssPercentile: 0.21718
ingestedAt: '2026-11-05T19:30:42.974Z'
---

## Overview

AB Download Manager before 1.11.2 contains a cross-site request forgery vulnerability in its unauthenticated browser-integration API that allows remote attackers to write attacker-chosen files to arbitrary paths. A malicious web page can send a text/plain request to /start-headless-download with crafted folder and name values, placing payloads in startup folders for code execution on next login.

## Affected

- `ab-download-manager < 1.11.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.