What’s Vulnerable › Products

Progress Software Progress® Telerik® Fiddler® Classic vulnerabilities

4 known vulnerabilities, 0 confirmed exploited in the wild (CISA KEV), 4 published in the last 12 months.

Check whether your Progress Software Progress® Telerik® Fiddler® Classic version is affected

Latest Progress Software Progress® Telerik® Fiddler® Classic vulnerabilities

• CVE-2026-77805 — Weak Executable Signature Verification Vulnerability in Progress® Telerik® Fiddler® Classic (CVSS 7.9)
• CVE-2026-77804 — Time-of-check Time-of-use (TOCTOU) Race Condition in Root Certificate Installation in Progress® Telerik® Fiddler® Classic (CVSS 6.6)
• CVE-2026-77803 — Front-end Desynchronization Vulnerability in Progress® Telerik® Fiddler® Classic (CVSS 3.6)
• CVE-2026-77802 — HTTP Request Smuggling Vulnerability in Progress® Telerik® Fiddler® Classic (CVSS 6.3)