9.8

CVE-2026-6023: progress software telerik ui for asp.net ajax Deserialization of Untrusted Data

CVSS: 9.8v3.1CriticalAnalyzed
Published 22-04-2026Last modified 23-04-2026
Open JSON

Vulnerability summary

CVE-2026-6023 is a critical (CVSS 9.8) Deserialization of Untrusted Data vulnerability in progress software telerik ui for asp.net ajax. EPSS estimates a 0.73% chance of exploitation in the next 30 days, higher than 53.7% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
0.73%
0%100%
Low · +0.19 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 22-04-2026
    PublishedVulnerability first disclosed.
  2. 23-04-2026
    Last modifiedVulnerability information updated.

Description

In Progress® Telerik® UI for AJAX versions 2024.4.1114 through 2026.1.421, the RadFilter control is vulnerable to insecure deserialization when restoring filter state if the state is exposed to the client. If an attacker tampers with this state, a server-side remote code execution is possible.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.73%

Chance of exploitation in the next 30 days

Percentile

54%

Versus all other CVEs

30-day change

+0.19 pp

From 0.54% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.73%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Progress1 product
Progress software1 product

2 vendors · 2 products

References

1 links