CVE-2026-123317High· 8.1▾ TwilightIn JetBrains Ktor before 3.6.1 session forgery was possible via tampered encrypted session cookies
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 44.6 · likelihood 0 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
In JetBrains Ktor before 3.6.1 session forgery was possible via tampered encrypted session cookies
Ktor < 3.6.1Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-123318Medium· 4.8In JetBrains Ktor before 3.6.1 hTTP request smuggling was possible in the CIO engine
CVE-2026-123319Low· 3.7In JetBrains Ktor before 3.6.1 missing Domain attribute validation in client cookie storage allowed cookie injection
CVE-2026-123832Critical· 9.6In JetBrains CLion before 2026.2 code execution was possible in Safe Mode via JSON compilation database
CVE-2026-123831Critical· 9.6In JetBrains CLion before 2026.2, 2026.1.4 code execution was possible in Safe Mode via Meson project settings
CVE-2026-123836High· 8.8In JetBrains Datalore before 2026.4 workspace collaborators could obtain the owner's SSH private key via Git backup
CVE-2026-123834High· 7.5In JetBrains Datalore before 2026.4 improper scope validation in database tasks allowed using another workspace's service account