A vulnerability has been reported in the windows installer (MSI) built with InstallScript…
Priority LOW 36Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0028 20th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:flexera:revenera_installshield:*:*:*:*:*:windows:*:* | before 2021 | Vulnerable | Flexera |
| cpe:2.3:a:flexera:revenera_installshield:2021:-:*:*:*:windows:*:* | 2021 | Vulnerable | Flexera |
| cpe:2.3:a:flexera:revenera_installshield:2021:r1:*:*:*:windows:*:* | 2021 r1 | Vulnerable | Flexera |
- cpe:2.3:a:flexera:revenera_installshield:*:*:*:*:*:windows:*:* Versions before 2021 Vulnerable ·Flexera
- cpe:2.3:a:flexera:revenera_installshield:2021:-:*:*:*:windows:*:* Versions 2021 Vulnerable ·Flexera
- cpe:2.3:a:flexera:revenera_installshield:2021:r1:*:*:*:windows:*:* Versions 2021 r1 Vulnerable ·Flexera
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-41526
- 2026-10-03 Alias added: GHSA-q4jw-3mfc-r879
References
Advisory 2
Sources
- CVE-2021-41526 · CVE Program
- CVE-2021-41526 · NVD
- FIRST EPSS
- GHSA-q4jw-3mfc-r879 · GitHub Advisory Database · CC BY 4.0
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