CVE-2026-6023: In Progress® Telerik® UI for AJAX versions 2024.4.1114 through 2026.1.421, the RadFilter control is vulnerable

This month

HIGH 8.1REMOTEUPGRADE

CVE-2026-6023 is a high-severity flaw (CVSS 8.1) affecting telerik ui for asp.net ajax. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-04-22
Last modified	2026-10-26

Publisher (CNA): Progress Software Corporation · Vendor: progress

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-22 08:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

progress telerik ui for asp.net ajax UPGRADE

Affected: >= 2024.4.1114 and < 2026.1.421

Fixed in: 2026.1.421

Safe to downgrade to: a release before 2024.4.1114

1. Check installed version

apt-cache policy telerik-ui-for-asp.net-ajax || rpm -q telerik-ui-for-asp.net-ajax || telerik-ui-for-asp.net-ajax --version

2. UPGRADE to 2026.1.421 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade telerik-ui-for-asp.net-ajax

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade telerik-ui-for-asp.net-ajax

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2024.4.1114 (Debian / Ubuntu)

apt-cache madison telerik-ui-for-asp.net-ajax sudo apt install telerik-ui-for-asp.net-ajax=<VERSION_BEFORE_2024.4.1114> sudo apt-mark hold telerik-ui-for-asp.net-ajax

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list telerik-ui-for-asp.net-ajax sudo dnf downgrade telerik-ui-for-asp.net-ajax-<VERSION_BEFORE_2024.4.1114> sudo dnf versionlock add telerik-ui-for-asp.net-ajax

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-6023?

telerik ui for asp.net ajax: upgrade to 2026.1.421. Exact commands for each OS are on this page.

Is CVE-2026-6023 being exploited?

CVE-2026-6023 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-6023 affect?

CVE-2026-6023 affects telerik ui for asp.net ajax. Severity is high (CVSS 8.1). 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 s

How urgent is CVE-2026-6023?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

Software pages

.NET vulnerabilities

Related CVEs

CVE-2026-6022 HIGH 7.5 UPGRADE In Progress® Telerik® UI for AJAX prior to 2026.1.421, RadAsyncUpload contains an uncontrolled resource consum
CVE-2026-13181 HIGH 8.1 UPGRADE In Progress® Telerik® UI for AJAX prior to v2026.2.708, forged upload metadata can influence AsyncUploadTypeNa
CVE-2026-13186 HIGH 8.1 UPGRADE In Progress® Telerik® UI for AJAX prior to v2026.2.708, a path traversal vulnerability in the file-based persi
CVE-2026-13185 HIGH 8.1 UPGRADE In Progress® Telerik® UI for AJAX prior to v2026.2.708, applications using cookie-based storage in RadPersiste
CVE-2026-13182 HIGH 7.5 UPGRADE In Progress® Telerik® UI for AJAX prior to v2026.2.708, RadAsyncUpload client-state processing can distinguish

References

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