How serious is CVE-2026-2878?

This vulnerability has a CVSS score of 5.9 out of 10, classified as MEDIUM severity. Proof-of-concept exploit code is publicly available, making this an active threat.

Is there exploit code available for CVE-2026-2878?

Yes, proof-of-concept exploit code for CVE-2026-2878 is publicly available on GitHub and security research platforms. This increases the risk of active exploitation.

Which products are affected by CVE-2026-2878?

CVE-2026-2878 affects progress telerik ui for asp.net ajax. Check the full CVE details for specific version information.

How do I fix CVE-2026-2878?

To remediate CVE-2026-2878, check for security patches from progress. Apply all available updates and security patches. If no patch is available, implement recommended workarounds or security controls to mitigate the risk.

CVE-2026-2878

Medium

|5.9

Exploit Available

Plain English Summary

AI-powered analysis for quick understanding

This vulnerability allows an attacker to tamper with uploaded files by exploiting a predictable temporary identifier used in the file upload process. It mainly affects versions of Telerik UI for AJAX before 2026.1.225, where the attacker needs to know the timestamp and filename to create a conflicting upload.

Technical Description

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.

CVSS Vector Analysis

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

Confidentiality ImpactNone

Integrity ImpactHigh

Availability ImpactNone

ScopeUnchanged

Vector String

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Resources

Search for proof-of-concept code and exploit modules

GitHub Search Exploit-DB Nuclei Templates Metasploit Vulners

Official References

NIST NVD

Est. Bounty

$828($500-$1K)

Vendor Response

Grade APatched in 1 day

Quick Information

Published

Feb 25, 2026

about 1 month ago

Last Modified

Feb 26, 2026

about 1 month ago

Vendor

progress

Product

telerik ui for asp.net ajax

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