---
id: CVE-2026-123317
title: >-
  In JetBrains Ktor before 3.6.1 session forgery was possible via tampered
  encrypted session cookies
summary: >-
  In JetBrains Ktor before 3.6.1 session forgery was possible via tampered
  encrypted session cookies
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-354
vendor: JetBrains
product: Ktor
affected:
  - Ktor < 3.6.1
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-11-06T00:00:00+00:00'
published: '2026-11-06'
updated: '2026-11-07'
sourceUpdated: '2026-11-07T04:55:31.829Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-123317'
references:
  - url: 'https://www.jetbrains.com/privacy-security/issues-fixed/'
tags:
  - cve.org
ingestedAt: '2026-11-06T10:49:35.352Z'
---

## Overview

In JetBrains Ktor before 3.6.1 session forgery was possible via tampered encrypted session cookies

## Affected

- `Ktor < 3.6.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.