CVE-2026-123317

Session Forgery via Tampered Encrypted Cookies in JetBrains Ktor

Published Nov 6, 2026 CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Description
In JetBrains Ktor before 3.6.1 session forgery was possible via tampered encrypted session cookies

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Jetbrains
Jetbrains ktor
Vendors & Products Jetbrains
Jetbrains ktor
Type Values Removed Values Added
Title Session Forgery via Tampered Encrypted Cookies in JetBrains Ktor
Type Values Removed Values Added
Description In JetBrains Ktor before 3.6.1 session forgery was possible via tampered encrypted session cookies
Weaknesses CWE-354
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
JetBrains
Published
Updated
Nov 7, 2026, 6:26 PM
Reserved
Nov 5, 2026, 6:38 PM
Status
Awaiting Analysis
Published
Nov 6, 2026, 11:17 AM
Modified
Nov 7, 2026, 7:17 PM