CVE-2026-77805 In Progress Telerik Fiddler Classic - Privilege Escalation

In Progress Telerik Fiddler Classic for Windows < 6.0.20262.10021 contains a privilege escalation caused by insufficient integrity checks on external helper tools, letting local low-privilege attackers execute unintended code with elevated privileges, exploit requires user to launch the tool and approve elevation prompt.

CVSS base score 7.9 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.06% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Privilege Escalation
Impact
Privilege Escalation, Remote Code Execution
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Published
5 October 2026
Updated
15 October 2026
Weakness
CWE-347

Vendor fix

Update to version 6.0.20262.10021 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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