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.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.9",
  "pubDate": "2026-07-22T14:17:14.417Z",
  "pubdate": "2026-07-22T14:17:14.417Z",
  "executiveSummary": "A parameter tampering vulnerability has been identified in Progress Telerik UI for AJAX prior to version 2026.2.708.\nThe vulnerability resides within the DialogHandler component, where incoming request parameters can be maliciously modified by an unauthorized actor.\nSuccessful exploitation of this flaw allows an attacker to alter server-side dialog behavior, potentially leading to chained exploitation scenarios and further compromise of the underlying web application.\nThe risk implication is elevated due to the potential for attackers to leverage this control flow manipulation as part of a broader attack chain against vulnerable systems.\nAffected products include Progress Telerik UI for AJAX versions prior to 2026.2.708.\nExploitation requirements include network access to the target web application and the ability to intercept and manipulate HTTP request parameters destined for the DialogHandler endpoint.",
  "technicalDetails": "The vulnerability stems from insufficient validation and integrity checking of request parameters processed by the DialogHandler component within Progress Telerik UI for AJAX prior to version 2026.2.708.\nThe vulnerable component is responsible for handling server-side dialog states and operations within the Telerik framework.\nBecause the application fails to adequately sanitize or cryptographically verify the parameters supplied in DialogHandler requests, an adversary can manipulate these inputs during transit.\nThe attack flow begins when an attacker intercepts standard HTTP requests directed toward the DialogHandler endpoint.\nBy modifying specific request parameters, the attacker forces the server-side logic to process unintended execution paths or states.\nThis manipulation alters the expected server-side behavior of the dialog mechanics, deviating from the standard control flow enforced by the application.\nWhile the parameter tampering vulnerability itself modifies dialog behavior, its primary danger lies in its capability to serve as a vector for chained exploitation, where altered server states facilitate subsequent, more severe attack primitives.\nNetwork exposure is present wherever the Telerik UI for AJAX DialogHandler endpoint is accessible to clients over HTTP or HTTPS.\nAuthentication and privilege requirements depend on the specific application implementation, but the vulnerability can potentially be triggered by unauthenticated or low-privileged users depending on how the DialogHandler is exposed within the web application architecture."
}