CVE-2024-4358 Progress Telerik Report Server Authentication Bypass by Spoofing Vulnerability
Progress Telerik Report Server contains an authorization bypass by spoofing vulnerability that allows an attacker to obtain unauthorized access.
From the CISA KEV catalogue version 2026.11.06, with Cybergen analysis. Updated 6 Nov 2026.
Should You Worry?
- CISA confirmed exploitation in the wild and added it to the Known Exploited Vulnerabilities catalogue on 13 Jun 2024.
- Rated Critical severity (CVSS 9.8, scored by Vendor).
- It has been in the catalogue for 876 days. Systems still unpatched now have almost certainly been scanned for it.
What It Is
In Progress Telerik Report Server, version 2024 Q1 (10.0.24.305) or earlier, on IIS, an unauthenticated attacker can gain access to Telerik Report Server restricted functionality via an authentication bypass vulnerability.
Affected Versions
| Product | Versions |
|---|---|
| Progress Software Corporation Telerik Report Server | 1.0.0 to before 10.1.24.514 |
From the public CVE record, as supplied by the vendor. Always confirm against the vendor advisory.
What To Do Now
- 1
Find it
Search your asset inventory and external attack surface for Progress Telerik Report Server. Include cloud images, appliances and anything a supplier runs for you.
Attack Surface Management - 2
Fix it
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Vulnerability Management - 3
Hunt for compromise
If an affected system was reachable before you patched, assume it may have been hit. Check logs, new accounts, web shells and outbound connections from the date of exposure.
Incident Response - 4
Prove it is fixed
Rescan or test the system after patching. Upgrades that fail silently and forgotten secondary instances are common.
Penetration Testing
The Compliance Clock
General guidance, not legal advice. Your obligations depend on your sector, scope and jurisdiction.
Not Sure If You Are Exposed?
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