CVE-2026-121451

AB Download Manager before 1.11.2 Arbitrary File Write via /start-headless-download CSRF

8.7 High

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Passive

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.29%Unchanged since Nov 4, 2026

What each source reports

CVE List Score used 8.7

AB Download Manager before 1.11.2 Arbitrary File Write via /start-headless-download CSRF

Record: CVE-2026-121451
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-352
Updated: 2026-11-03

EUVDEUVD-2026-115883 8.7

Record: EUVD-2026-115883
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated: 2026-11-03

GitHub AdvisoriesGHSA-v768-hp7c-4rf7 8.7

AB Download Manager before 1.11.2 contains a cross-site request forgery vulnerability in its...

Record: GHSA-v768-hp7c-4rf7
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-352
Updated: 2026-11-03

NVD 8.7

Record: CVE-2026-121451
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-352
Updated: 2026-11-03

OSV 8.7

AB Download Manager before 1.11.2 Arbitrary File Write via /start-headless-download CSRF

Record: CVE-2026-121451
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness: CWE-352
Updated: 2026-11-05

Affected products

amir1376 ab-download-manager

History

History
Recorded	Changed	Sources
Nov 4, 2026	references	OSV
Nov 3, 2026	published	EUVD
Nov 3, 2026	published	EUVD
Nov 3, 2026	aliases, references	GitHub Advisories, NVD
Nov 3, 2026	cwes, facts, references, severity, title	CVE List
Nov 3, 2026	first indexed	EUVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-121451 is a high vulnerability (CVSS 8.7) in Amir1376 Ab-download-manager, published November 3, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.29%, the 21st percentile. No source names a fixed version.