Full Report
Progress Software security advisory (AV26-875)
Analysis Summary
# Main Topic
Progress Software security advisory (AV26‑875) – two critical vulnerabilities affecting **Telerik UI for ASP.NET AJAX** components (RadImageEditor and DialogHandler) prior to version **2026.3.812**.
## Key Points
- **Vulnerability 1 (CVE‑2026‑18672)** – *RadImageEditor Path Traversal*: allows attackers to read arbitrary files on the host by manipulating the `Path` parameter.
- **Vulnerability 2 (CVE‑2026‑19219)** – *DialogHandler UploadPaths Tampering*: permits modification of upload directory paths, enabling arbitrary file upload or overwrite.
- Both flaws are exploitable remotely with no authentication required.
- No active threat actor attribution; the advisory focuses on patching and mitigation steps.
## Threat Actors
- None identified. The advisory does not attribute the exploitation to any known threat group or individual.
## TTPs
- **Path Traversal** – exploitation of insufficient input validation to access files outside the intended directory.
- **Upload Path Tampering** – manipulation of server-side upload configuration to place files in unintended locations.
- Both TTPs facilitate **remote code execution** or **privilege escalation** if the uploaded files are executed.
## Affected Systems
- **Telerik UI for ASP.NET AJAX** components:
- *RadImageEditor* – versions **before 2026.3.812**.
- *DialogHandler* – versions **before 2026.3.812**.
- Any web applications deploying these components on Windows or Linux servers are potentially vulnerable.
## Mitigations
- **Update to the latest version** of Telerik UI for ASP.NET AJAX (≥ 2026.3.812) as soon as possible.
- If an upgrade is not immediately feasible, apply the vendor‑provided **hot‑fixes** or configuration changes outlined in the Telerik knowledge‑base articles.
- **Validate and sanitize** any file‑path inputs on the server side; enforce strict whitelist checks.
- Deploy **web application firewalls (WAF)** or similar controls to block path‑traversal patterns.
- Monitor for anomalous file‑access or upload activity in logs.
## Conclusion
The advisory highlights two high‑severity vulnerabilities that could allow unauthenticated attackers to read arbitrary files or upload malicious content. Immediate patching of Telerik UI components to version 2026.3.812 or later is the most effective defense. In the meantime, enforce strict input validation and consider WAF rules to mitigate exploitation risks.