Vulnerability in Progress Telerik Ui For Asp.net Ajax
CVE-2026-2878
In Progress® Telerik® UI for AJAX, versions prior to 2026.1.225, an insufficient entropy vulnerability exists in RadAsyncUpload, where a predictable temporary identifier, based on timestamp and filename, can enable collisions and file content tampering.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (22.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 22.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Progress Telerik Ui For Asp.net Ajax
- Progress Software Telerik Ui For Asp.net Ajax — versions 2011.2.712
Weakness classification (CWE)
References
- www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-i… (vendor-advisory, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-2878?
- CVE-2026-2878 is a medium-severity vulnerability in Progress Telerik Ui For Asp.net Ajax, classified under Insufficient Entropy. CVSS score: 5.3/10. Published 2026-02-25.
- How severe is CVE-2026-2878?
- Medium severity. CVSS v3 base score is 5.3 out of 10.