CVE-2024-4358 is an authentication bypass by spoofing vulnerability in Progress Telerik Report Server. CISA added it to the Known Exploited Vulnerabilities catalogue on 13 June 2024, which means attackers have used it in real attacks. Progress Telerik Report Server contains an authorization bypass by spoofing vulnerability that allows an attacker to obtain unauthorized access.
What this CVE means in practice
CVE-2024-4358 is dangerous because authentication bypass by spoofing lets an attacker act as if they were already trusted. In a report server, that can expose published reports, administrative functions, and any data the server can reach through its own privileges.
That kind of flaw is especially serious when the vulnerable product sits inside a broader reporting or analytics workflow, because the attacker may not need to steal a valid password first. Instead, the weakness can let them step around the normal trust check and reach content or functions that should have stayed gated.
Why spoofing-based authentication bypasses are high impact
Spoofing attacks exploit the difference between being authenticated in the application’s view and being legitimately authenticated in reality. When that boundary breaks, the application can hand out unauthorized access, and downstream systems may treat the attacker as a trusted caller.
For a product like Telerik Report Server, the risk is not just one account being lost. The more important question is what that account, session, or internal trust relationship can reach, because reporting platforms often store business data, credentials to data sources, or links into other enterprise systems.
NIST Cybersecurity Framework 2.0 is useful here because it frames this as an identity and access failure that must be governed, protected, detected, and recovered from as part of the wider security posture.
How organisations confirm exposure and limit blast radius
Exposure checks should start with a precise asset inventory: where Telerik Report Server is deployed, whether it is internet-facing, who can reach it internally, and whether any reverse proxy or SSO layer changes the trust boundary. Vendor advisories and the CISA KEV catalogue should be used for authoritative patch and remediation details.
Even before patching, organisations should reduce the blast radius by restricting network access, segmenting the server from sensitive back-end systems, and reviewing whether the application has been granted unnecessary data source or service permissions. If the server is already exposed to untrusted networks, the urgency is higher because exploitation can be attempted remotely at scale.
NIST National Vulnerability Database and CVE Program are the right reference points for canonical vulnerability tracking, while Vulnerability Management Guide covers prioritisation, asset scope, and remediation workflow once a CVE is known to be exploited.
Detection, remediation, and post-patch review
Remediation should include the vendor fix as soon as it is available and feasible, but patching alone is not enough when a vulnerability has already been exploited in the wild. Organisations should look for unexpected administrative actions, new users, altered configuration, unusual report access, and any evidence that the server was used as a stepping stone into other systems.
Post-patch review matters because authentication bypasses often leave behind more than one artifact. Attackers may have created accounts, stolen session material, exported reports, or used the trusted server to reach databases and internal APIs. Any secrets, keys, or service credentials that the server could access should be reviewed for rotation if compromise is suspected.
For deeper reading on exploited authentication bypass patterns, CitrixBleed 2 2025 and TeamCity CVE-2023-42793 SVR exploitation 2023 show how trusted access paths can be abused to move from one foothold to broader compromise.
Risk and Threat Considerations
This CVE is risky because authentication bypass by spoofing can convert a single exposed application into a trust breach. Once an attacker gets unauthorized access, the impact can extend beyond the report server itself if it can read sensitive data, query back-end databases, or expose credentials and session material.
Failure mechanism: The application accepts a spoofed or forged trust signal, so the attacker is treated as authenticated and can reach functions or data that should require legitimate proof of identity.
Impact: Unauthorized access can lead to report theft, data exposure, privilege abuse, lateral movement, and compromise of the identities or secrets that the server can access.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST CSF 2.0, NIST SP 800-53 Rev 5 and CIS Controls v8 set the technical controls, while ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | GV.OC-01 — Organizational Context | Defines governance context for exposed internet-facing systems and trust boundaries. |
| ID.AM-01 — Asset Inventory | Applies because exposure analysis depends on knowing where the vulnerable server exists. | |
| PR.AA-05 — Identity Management, Authentication, and Access Control | Directly covers authentication failure and unauthorized access caused by spoofing. | |
| Recommendation — Document the report server’s exposure, trust boundary, and ownership under governance processes. Inventory every Telerik Report Server instance and classify its exposure and dependencies. Enforce strong authentication and access controls around the report server trust boundary. | ||
| NIST SP 800-53 Rev 5 | IA-2 — Identification and Authentication (Organizational Users) | Directly addresses trusted-user authentication that spoofing bypasses. |
| AC-6 — Least Privilege | Limits blast radius if the server is compromised and can reach other systems. | |
| AU-6 — Audit Record Review, Analysis, and Reporting | Supports post-compromise review of anomalous access and administrative actions. | |
| Recommendation — Require strong user authentication for any administrative or privileged report server access. Reduce the report server’s permissions to the minimum needed for reporting functions. Review logs for unauthorized access, account changes, and unusual report activity. | ||
| CIS Controls v8 | CIS-4 — Secure Configuration of Enterprise Assets and Software | Helps harden the exposed server and reduce exploitability of the vulnerable service. |
| CIS-16 — Application Software Security | Applies because the flaw is an application-layer authentication bypass requiring remediation. | |
| Recommendation — Harden the report server and its network exposure to reduce attacker reach. Track the vendor fix, verify deployment, and test the application after remediation. | ||
| ISO/IEC 27001:2022 | A.5.15 — Access control | Covers controlling access to information and services when spoofing can bypass trust checks. |
| Recommendation — Tighten access control for the report server and its connected data sources. | ||
Practitioner Guidance
What to watch for: Treat any report server that is internet-reachable, externally proxied, or integrated with sensitive data sources as high priority for review. If exploitation is suspected, assume the issue may have moved from a vulnerability-management problem into an incident-response problem.
Practitioner note: For this kind of CVE, the most important judgement is not just whether the patch is installed, but whether the server’s trusted position has already been abused. That is why exposure review, log review, and secret rotation belong together.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on October 17, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org