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high

CVE-2026-13182

Telerik UI for ASP.NET AJAX padding oracle in RadAsyncUpload client-state handling -> disclosure and forgery of protected upload metadata

Severity
high
Affected product
Telerik UI for ASP.NET AJAX
Affected versions
Telerik UI for ASP.NET AJAX ≥ 2010.1.309, < 2026.2.708
Fixed in
Telerik UI for ASP.NET AJAX 2026.2.708
Added to NewScan
2026-09-07
Detected by
NewScan — free, self-hosted

How NewScan reports it

COMPONENT VERSION RANGE

NewScan fingerprints Telerik UI for ASP.NET AJAX from its response and reports this CVE when the detected version falls inside the affected range below.

The enabler, not the payload: decrypt failures are distinguishable from invalid-JSON parse failures, which lets a remote attacker recover the protected metadata. Chained by the released 2026-09-07 public exploit: 13182/13183 recover the upload metadata protection, 13184 supplies the key when the app never set one, and 13181 turns the forged metadata into code execution. Version-match only - the RadAsyncUpload handler answers identically on patched and unpatched builds, and none of the four can be confirmed non-destructively. 13183's own mechanism is a timing oracle; THIS row concludes from a version string, never from a response-time delta (docs/signature-packs.md and the daily-cve no-timing rule).

References

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