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…

PriorityP432medium5.9CVSS 3.1

AVNACHPRNUINSUCNIHAN

EPSS

0.18%

7.4th percentile

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.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
progress	telerik_ui_for_asp.net_ajax	< 2026.1.225	2026.1.225
progress_software	telerik_ui_for_asp.net_ajax	>= 2011.2.712 < 2026.1.225	2026.1.225

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.