CVE-2021-41526

A vulnerability has been reported in the windows installer (MSI) built with InstallScript custom...

7.8 High

A vulnerability has been reported in the windows installer (MSI) built with InstallScript custom action. This vulnerability may allow privilege escalation when invoked ‘repair’ of the MSI which has an InstallScript custom action.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.28%Up 0.2 points since Mar 30, 2023

What each source reports

NVD Score used 7.8

Record: CVE-2021-41526
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-41526
Updated: 2026-11-02

EUVDEUVD-2021-28545 No score

Record: EUVD-2021-28545
Updated: 2026-11-03

GitHub AdvisoriesGHSA-q4jw-3mfc-r879 7.8

A vulnerability has been reported in the windows installer (MSI) built with InstallScript custom...

Record: GHSA-q4jw-3mfc-r879
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

flexera revenera installshield

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

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

In short

CVE-2021-41526 is a high vulnerability (CVSS 7.8) in Flexera Revenera Installshield, published March 29, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.28%, the 20th percentile. No source names a fixed version.