CVE-2026-123317
In JetBrains Ktor before 3.6.1 session forgery was possible via tampered encrypted session cookies
In JetBrains Ktor before 3.6.1 session forgery was possible via tampered encrypted session cookies
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
In JetBrains Ktor before 3.6.1 session forgery was possible via tampered encrypted session cookies
- Record
CVE-2026-123317- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-354
- Updated
- 2026-11-07
EUVDEUVD-2026-118081
In JetBrains Ktor before 3.6.1 session forgery was possible via tampered encrypted session cookies
- Record
EUVD-2026-118081- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N - Updated
- 2026-11-07
GitHub AdvisoriesGHSA-76h9-4mx5-8c9v
In JetBrains Ktor before 3.6.1 session forgery was possible via tampered encrypted session cookies
In JetBrains Ktor before 3.6.1 session forgery was possible via tampered encrypted session cookies
- Record
GHSA-76h9-4mx5-8c9v- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-354
- Updated
- 2026-11-06
NVD
In JetBrains Ktor before 3.6.1 session forgery was possible via tampered encrypted session cookies
- Record
CVE-2026-123317- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-354
- Updated
- 2026-11-07
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| published | EUVD | |
| published | EUVD, NVD | |
| aliases, references, title | GitHub Advisories | |
| cwes, severity | CVE List | |
| first indexed | EUVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-123317 is a high vulnerability (CVSS 8.1) in Jetbrains Ktor, published November 6, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.20%, the 10th percentile. No source names a fixed version.