How severe is CVE-2026-13188?

CVE-2026-13188 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-13188 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-13188?

CVE-2026-13188 affects Progress Telerik Ui For Asp.net Ajax. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-13188?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-13188 published?

CVE-2026-13188 was published on 2026-07-22 and last updated on 2026-08-06.

CVE-2026-13188

CVE-2026-13188 is a medium-severity vulnerability in Progress Telerik Ui For Asp.net Ajax with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-345.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-345
Affected product: Progress Telerik Ui For Asp.net Ajax
Published: 2026-07-22
Last modified: 2026-08-06

Description

In Progress® Telerik® UI for AJAX prior to v2026.2.708, DialogHandler request parameters may be tampered with, potentially altering dialog server-side behavior and enabling chained exploitation.

Frequently asked questions

What is CVE-2026-13188?: In Progress® Telerik® UI for AJAX prior to v2026.2.708, DialogHandler request parameters may be tampered with, potentially altering dialog server-side behavior and enabling chained exploitation.
How severe is CVE-2026-13188?: CVE-2026-13188 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-13188 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-13188?: CVE-2026-13188 affects Progress Telerik Ui For Asp.net Ajax. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-13188?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-13188 published?: CVE-2026-13188 was published on 2026-07-22 and last updated on 2026-08-06.

References

https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-dialoghandler-parameters-tampering-CVE-2026-13188

Affected products (1)

cpe:2.3:a:progress:telerik_ui_for_asp.net_ajax:*:*:*:*:*:*:*:*

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