CVE-2026-6023Network attack vector

Remote code execution via tampered filter-state cookie

Published Apr 22, 2026 · Updated Apr 22, 2026

Insecure deserialization in Telerik UI for ASP.NET AJAX 2024.4.1114 through 2026.1.225 allows remote attackers to execute server-side code. RadFilter's LoadState() path deserializes persisted filter state read from a configured CookieStateStorageProvider HTTP cookie without protecting it from tampering. Exploitation requires RadFilter and RadPersistenceManager on the page, cookie-backed custom storage, and a LoadState() call; the safe default stores state server-side.

CVSS severity8.1
High
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insecure deserialization in Telerik UI for ASP.NET AJAX 2024.4.1114 through 2026.1.225 allows remote attackers to execute server-side code. RadFilter's LoadState() path deserializes persisted filter state read from a configured CookieStateStorageProvider HTTP cookie without protecting it from tampering. Exploitation requires RadFilter and RadPersistenceManager on the page, cookie-backed custom storage, and a LoadState() call; the safe default stores state server-side.

The record

CVE
CVE-2026-6023
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
Progress Software Corporation
Product
Telerik UI for ASP.NET AJAX
Classifications
CWE-502, CAPEC-586, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2024.4.1114 <2026.1.421

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Progress Software Corporation · Telerik UI for ASP.NET AJAXversion=2024.4.1114 <2026.1.421

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1Progress Software CorporationCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
CAPEC-586Object Injection
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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