How severe is CVE-2026-13186?

CVE-2026-13186 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-13186 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-13186?

CVE-2026-13186 affects Progress Telerik Ui For Asp.net Ajax. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-13186?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-13186 published?

CVE-2026-13186 was published on 2026-07-22 and last updated on 2026-08-06.

CVE-2026-13186

CVE-2026-13186 is a high-severity vulnerability in Progress Telerik Ui For Asp.net Ajax with a CVSS 3.x base score of 8.1. 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-22.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
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, a path traversal vulnerability in the file-based persistence storage provider can be exploited when the storage key is derived from user-controlled input, enabling attacker-controlled deserialization and remote code execution.

Frequently asked questions

What is CVE-2026-13186?: In Progress® Telerik® UI for AJAX prior to v2026.2.708, a path traversal vulnerability in the file-based persistence storage provider can be exploited when the storage key is derived from user-controlled input, enabling attacker-controlled deserialization and remote code execution.
How severe is CVE-2026-13186?: CVE-2026-13186 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-13186 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-13186?: CVE-2026-13186 affects Progress Telerik Ui For Asp.net Ajax. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-13186?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-13186 published?: CVE-2026-13186 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-appdata-path-traversal-deserialization-CVE-2026-13186

Affected products (1)

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

More vulnerabilities in Progress Telerik Ui For Asp.net Ajax

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