CVE-2026-13182Network attack vector

Metadata disclosure via decrypt-versus-parse padding oracle

Published Jul 22, 2026 · Updated Jul 22, 2026

Information disclosure in Telerik UI for ASP.NET AJAX before 2026.2.708 allows remote attackers to reveal protected upload metadata. RadAsyncUpload returns distinguishable outcomes when client-state decryption fails and when decrypted text fails JSON parsing, exposing a padding oracle. Exposure requires RadAsyncUpload and nonuniform remote error responses; no authentication or encryption-key knowledge is required, and the direct impact is metadata disclosure.

CVSS severity7.5
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Telerik UI for ASP.NET AJAX before 2026.2.708 allows remote attackers to reveal protected upload metadata. RadAsyncUpload returns distinguishable outcomes when client-state decryption fails and when decrypted text fails JSON parsing, exposing a padding oracle. Exposure requires RadAsyncUpload and nonuniform remote error responses; no authentication or encryption-key knowledge is required, and the direct impact is metadata disclosure.

The record

CVE
CVE-2026-13182
Published
Jul 22, 2026
Updated
Jul 22, 2026
Vendor
Progress Software Corporation
Product
Telerik UI for ASP.NET AJAX
Classifications
CWE-209, CAPEC-463, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2010.1.309 <2026.2.708

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Progress Software Corporation · Telerik UI for ASP.NET AJAXversion=2010.1.309 <2026.2.708

Published CVSS scores

7.5Progress Software CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-209Generation of Error Message Containing Sensitive Information
CAPEC-463Padding Oracle Crypto Attack
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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