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VulnerabilityCVE-2026-13184Published 2026-07-22

CVE-2026-13184 — Progress Software Telerik UI for ASP.NET AJAX

high

As of 2026-07-22, CVE-2026-13184 is a HIGH-severity vulnerability in Progress Software Telerik UI for ASP.NET AJAX, CVSS v3.1 7.5, EPSS 0.2% (18.2th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-13184, most recently “Telerik UI for ASP.NET AJAX — Padding Oracle Chained to Unauthenticated Deserialization RCE (CVE-2026-13181–13184)”.

CVSS v3.1
7.5/10High
EPSS
0.2%Higher than 18.2% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
1Campaigns referencing it
Priority
4.5/10Threadlinqs triage score
Published
CVSS v3.1 7.5 (HIGH) · EPSS 0.2% (higher than 18.2% of all scored CVEs) · Priority 4.5/10 · Published 2026-07-22

Last updated:

What is CVE-2026-13184?

In Progress® Telerik® UI for AJAX prior to v2026.2.708, when Telerik.Upload.ConfigurationHashKey is absent and machineKey is not explicitly configured, upload metadata integrity protection may fall back to a predictable default key, enabling attackers to forge protected upload metadata and unlock further exploit chains.

The record classifies CVE-2026-13184 under weakness class CWE-321. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on integrity. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 80 days ago.

Severity and exploitation probability

CVSS v3.1 base score
7.5 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS (FIRST)
0.2% probability of exploitation in the next 30 days, higher than 18.2% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
4.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-07-22

Is CVE-2026-13184 being exploited?

It currently carries a trending score of 20 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-13184

Vendor advisory: https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-rau-unauth-deserialization-chain-cve-2026-13184. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-13184

1 tracked threat in the Threadlinqs corpus references CVE-2026-13184, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Vendor advisory and patch