Assessment
Why it matters
EPSS is 0.5%; technical severity is CVSS 8.1.
In Progress® Telerik® UI for AJAX prior to v2026.2.708, a deserialization vulnerability in the persistence utilities allows unsafe type instantiation from attacker-influenced persisted state, which can lead to remote code execution.
Who should care
- Teams operating Telerik UI for ASP.NET AJAX
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Telerik UI for ASP.NET AJAX is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Telerik Security patch CVE-2026-13190
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteAutomated link verification has not completed for this guidance yet.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-502
- Affected versions
- Progress Telerik UI for ASP.NET AJAX (Start Including 2011.2712, End Excluding 2026.2.708)
- Fixed versions
- Progress Telerik UI for ASP.NET AJAX (Fixed from 2026.2.708)
- Published
- 22 July 2026
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Latest EPSS score: 0.5%
- Signal calculated at 13