Is CVE-2026-2878 in the CISA KEV catalog?

No. CVE-2026-2878 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-2878?

CVE-2026-2878 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2026-2878?

CVE-2026-2878 has an EPSS score of 0.18% (7th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-2878?

Upgrade telerik ui for asp.net ajax to 2026.1.225 or later.

CVE & CISA-KEV Catalog

CVE-2026-2878

MEDIUM

5.3

CVSS v3

NVD

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.

CWE-331

How to fix

Remediation Available

telerik ui for asp.net ajaxNVD

Affected:< 2026.1.225Fixed in:2026.1.225CVE-2026-2878derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.18%probability of exploitation in 30 days

7thpercentile

Low risk: more likely to be exploited than 7% of all known CVEs.

References

Vendor Advisory1

telerik.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-02-26.