CVE-2019-18935: Progress Telerik UI for ASP.NET AJAX Deserialization of Untrusted Data Vulnerability
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Progress Telerik UI for ASP.NET AJAX contains a deserialization of untrusted data vulnerability through RadAsyncUpload which leads to code execution on the server in the context of the w3wp.exe process.
CSIRTS triage
- What
- A deserialization of untrusted data vulnerability can lead to code execution on the server.
- Who is affected
- Deployments of Progress Telerik UI for ASP.NET AJAX.
- Urgency
- Immediate action is required due to the critical nature of the vulnerability and confirmed exploitation.
- Action
- Apply the latest security updates from Progress.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2019-18935
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2019-18935Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99.9% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2019-18935 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for Progress Telerik UI
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- mediumCVE-2026-14932: In Progress® Telerik® UI for AJAX prior to v2026.2.708, the obsolete RadChart component's Char…nvd · 2026-07-22
- mediumCVE-2026-14865: In Progress® Telerik® UI for AJAX prior to v2026.2.708, the internal LayoutBuilder control pro…nvd · 2026-07-22
- mediumCVE-2026-13192: In Progress® Telerik® UI for AJAX prior to v2026.2.708, insufficient validation of content sub…nvd · 2026-07-22
- highCVE-2026-13190: In Progress® Telerik® UI for AJAX prior to v2026.2.708, a deserialization vulnerability in the…nvd · 2026-07-22
- highCVE-2026-13189: In Progress® Telerik® UI for AJAX prior to v2026.2.708, insufficient validation of the languag…nvd · 2026-07-22
- mediumCVE-2026-13188: In Progress® Telerik® UI for AJAX prior to v2026.2.708, DialogHandler request parameters may b…nvd · 2026-07-22
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