CVE-2026-121451 json
AB Download Manager before 1.11.2 Arbitrary File Write via /start-headless-download CSRF
published 6d ago modified 11h ago also EUVD-2026-115883
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 21%
- public exploits
- 0
- none known
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 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.
Patch / fix
Is CVE-2026-121451 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 11h ago
Exploit prediction
0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 8.7 | CVSS: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 |
Affected products
- amir1376 ab-download-manager
Classification
- Weakness
-
- CWE-352 Cross-Site Request Forgery
References
-
github.com
/amir1376/ab-download-manager/commit/34cd27af6a9a6c2046af112bc9bd34828fec0bbc
patch
-
github.com
/amir1376/ab-download-manager/issues/1489
issue-tracking
-
github.com
/amir1376/ab-download-manager
product
-
github.com
/amir1376/ab-download-manager/blob/v1.11.1/integration/server/src/main/kotlin/com/abdownloadmanager/integratio
technical-description
-
github.com
/amir1376/ab-download-manager/blob/v1.11.1/desktop/app/src/main/kotlin/com/abdownloadmanager/desktop/integrati
technical-description
-
vulncheck.com
/advisories/ab-download-manager-before-1.11.2-arbitrary-file-write-via-start-headless-download-csrf
third-party-advisory
Sources
- CVE List CVE-2026-121451
- NVD CVE-2026-121451
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.