CVE-2026-13189: In Progress® Telerik® UI for AJAX prior to v2026.2.708, insufficient validation of the language parameter in t

Routine

HIGH 7.5REMOTEUPGRADE

CVE-2026-13189 is a high-severity flaw (CVSS 7.5) 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 prior to v2026.2.708, insufficient validation of the language parameter in the spell check handler may allow an attacker to influence server-side file path resolution and trigger unintended server-side requests.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-36
Published	2026-07-22
Last modified	2026-10-24

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

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-22 14:17 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

progress telerik ui for asp.net ajax UPGRADE

Affected: >= 2011.2712 and < 2026.2.708

Fixed in: 2026.2.708

Safe to downgrade to: a release before 2011.2712

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 2026.2.708 (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 2011.2712 (Debian / Ubuntu)

apt-cache madison telerik-ui-for-asp.net-ajax sudo apt install telerik-ui-for-asp.net-ajax=<VERSION_BEFORE_2011.2712> 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_2011.2712> 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.

Exact fixes by distribution

Fedora ELN · ntpd-rs · FIXED · 1.7.2-3.eln159 · FEDORA-2026-57e4a99310 · source

sudo dnf upgrade --advisory=FEDORA-2026-57e4a99310

Fedora 46 · moby-engine · FIXED · 29.9.2-2.fc46 · FEDORA-2026-4856be87b3 · source

sudo dnf upgrade --advisory=FEDORA-2026-4856be87b3

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-2026-13189?

telerik ui for asp.net ajax: upgrade to 2026.2.708. Exact commands for each OS are on this page.

Is CVE-2026-13189 being exploited?

CVE-2026-13189 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-2026-13189 affect?

CVE-2026-13189 affects telerik ui for asp.net ajax. Severity is high (CVSS 7.5). In Progress® Telerik® UI for AJAX prior to v2026.2.708, insufficient validation of the language parameter in the spell check handler may allow an attacker to influence server-side file path resolution and trigger unintended server-side requ

How urgent is CVE-2026-13189?

Priority 38/100. High severity; Remotely exploitable, no login, no user action

Software pages

.NET vulnerabilities

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References

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