Description
Nullsoft Scriptable Install System (NSIS) before 3.11 on Windows allows local users to escalate privileges to SYSTEM during an installation, because the temporary plugins directory is created under %WINDIR%\temp and unprivileged users can place a crafted executable file by winning a race condition. This occurs because EW_CREATEDIR does not always set the CreateRestrictedDirectory error flag.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Nullsoft | Nullsoft Scriptable Install System | < 3.11 | 3.11 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | nsis | 3.11-1 | — |
| Debian 13 | nsis | 3.11-1 | — |
| Debian 12 | nsis | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | nsis | No fix yet | — |
| Ubuntu 26.04 LTS | nsis | No fix yet | — |
| Ubuntu 25.10 | nsis | No fix yet | — |
| Ubuntu 24.04 LTS | nsis | No fix yet | — |
| Ubuntu 22.04 LTS | nsis | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | nsis | No fix yet | — |
| Ubuntu 18.04 LTS | nsis | No fix yet | — |
| Ubuntu 16.04 LTS | nsis | No fix yet | — |
| Ubuntu Pro 14.04 LTS | nsis | No fix yet | — |
Advisories 4
- SSA-563922 SSA-563922: Local Privilege Escalation Vulnerability in SIMOTION Tools Siemens ProductCERT · Oct 13, 2026
- NCSC-2025-0274 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Sep 9, 2025
- ICSA-25-254-01 Siemens SIMOTION Tools CISA ICS & IT advisories · Sep 9, 2025
- WID-SEC-2025-1886 nmap: Schwachstelle ermöglicht Privilegieneskalation BSI CERT-Bund (WID) · Aug 21, 2025