Open redirect in Zscaler Client Connector
Priority LOW 38CWE-1287Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-601.
Summary
A URL parameter during login flow was vulnerable to injection. An attacker could insert a malicious domain in this parameter, which would redirect the user after auth and send the authorization token to the redirected domain.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00445 38th percentileScored 2026-11-07
Fix Fixed Client Connector (Zscaler): 3.9 Mac, 3.7 Win, 1.9.3 iOS +3
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 |
|---|---|---|---|---|---|
| Zscaler | Client Connector | before 3.9 Mac, 3.7 Win, 1.9.3 iOS, 1.10.2 Android, 1.10.1 Chrome OS, 1.4 Linux | 3.9 Mac, 3.7 Win, 1.9.3 iOS, 1.10.2 Android, 1.10.1 Chrome OS, 1.4 Linux | Patch available | CNA |
- Client Connector VendorZscaler Affected before 3.9 Mac, 3.7 Win, 1.9.3 iOS, 1.10.2 Android, 1.10.1 Chrome OS, 1.4 Linux Fixed in 3.9 Mac, 3.7 Win, 1.9.3 iOS, 1.10.2 Android, 1.10.1 Chrome OS, 1.4 Linux Patch available CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:linux:*:* | before 1.4 | Vulnerable | Zscaler |
| cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:iphone_os:*:* | before 1.9.3 | Vulnerable | Zscaler |
| cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:chrome_os:*:* | before 1.10.1 | Vulnerable | Zscaler |
| cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:android:*:* | before 1.10.2 | Vulnerable | Zscaler |
| cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:windows:*:* | before 3.7 | Vulnerable | Zscaler |
| cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:macos:*:* | before 3.9 | Vulnerable | Zscaler |
- cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:linux:*:* Versions before 1.4 Vulnerable ·Zscaler
- cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:iphone_os:*:* Versions before 1.9.3 Vulnerable ·Zscaler
- cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:chrome_os:*:* Versions before 1.10.1 Vulnerable ·Zscaler
- cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:android:*:* Versions before 1.10.2 Vulnerable ·Zscaler
- cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:windows:*:* Versions before 3.7 Vulnerable ·Zscaler
- cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:macos:*:* Versions before 3.9 Vulnerable ·Zscaler
Remediation
- Fix · CNA Client Connector (Zscaler) Fixed in 3.9 Mac, 3.7 Win, 1.9.3 iOS, 1.10.2 Android, 1.10.1 Chrome OS, 1.4 Linux
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Zscaler Client Connector 3.9 Mac, 3.7 Win, 1.9.3 iOS, 1.10.2 Android, 1.10.1 Chrome OS, 1.4 Linux
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2023-13310 Output encoding missing in redrurl parameterPriority LOW 38
Timeline
- 2026-10-02 Threatist record created from CVE-2023-28799
- 2026-10-03 Alias added: GHSA-frc9-g2r4-48w5
References
Other 6
- https://help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2021?applicable_category=Windows&applicable_version=3.7&deployment_date=2021-11-26&id=1386541
- https://help.zscaler.com/client-connector/client-connector-app-release-summary-2023?applicable_category=Chrome%20OS&applicable_version=1.10.1&deployment_date=2023-03-10&id=1447771
- https://help.zscaler.com/client-connector/client-connector-app-release-summary-2023?applicable_category=Android&applicable_version=1.10.2&deployment_date=2023-03-09&id=1447706
- https://help.zscaler.com/client-connector/client-connector-app-release-summary-2023?applicable_category=iOS&applicable_version=1.9.3&deployment_date=2023-03-03&id=1447071
- https://help.zscaler.com/client-connector/client-connector-app-release-summary-2022?applicable_category=Linux&applicable_version=1.4&deployment_date=2022-10-31&id=1420246
- https://help.zscaler.com/client-connector/client-connector-app-release-summary-2023?applicable_category=macOS&applicable_version=3.9&deployment_date=2023-01-25&id=1443546
More Zscaler Client Connector vulnerabilities
- TI-2020-09334 The Zscaler Client Connector for Windows prior to 2.1.2.74 had a stack based buffer… CVSS 3.1CRITICAL 9.8
- TI-2024-15528 Local Privilege Escalation via lack of input validation CVSS 3.1CRITICAL 9.8
- TI-2024-15526 Insecure MacOS code sign check fallback CVSS 3.1CRITICAL 9.8
- TI-2024-15505 Multiple Arbitrary Creates/Overwrites by link following CVSS 3.1CRITICAL 9.8
- TI-2023-13308 Out-of-bounds write to heap in pacparser CVSS 3.1CRITICAL 9.8
- TI-2023-13315 ZCC on Linux privilege escalation CVSS 3.1CRITICAL 9.8
Sources
- CVE-2023-28799 · CVE Program
- CVE-2023-28799 · NVD
- FIRST EPSS
- GHSA-frc9-g2r4-48w5 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences