CVE-2026-123319 json
In JetBrains Ktor before 3.6.1 missing Domain attribute validation in client cookie storage allowed cookie injection
published 3d ago modified 3d ago also EUVD-2026-118083
- cvss
- 3.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 5%
- public exploits
- 0
- none known
Summary
In JetBrains Ktor before 3.6.1 missing Domain attribute validation in client cookie storage allowed cookie injection
Patch / fix
- JetBrains Ktor 3.6.1
Is CVE-2026-123319 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N |
Affected products
- JetBrains Ktor
Classification
- Weakness
-
- CWE-565 Reliance on Cookies without Validation and Integrity Checking
References
Sources
- CVE List CVE-2026-123319
- NVD CVE-2026-123319
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