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CVE-2026-123317

8.1 highEPSS 0.2%

High (8.1) in jetbrains ktor. EPSS 0.2% estimated probability of exploitation activity in the next 30 days.

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

Severity

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
EPSS
0.2% estimated probability of exploitation activity in the next 30 days; 10th percentile. Scored 2026-11-10. A forecast for this CVE across the internet, not for your own systems.
CISA's assessment (SSVC)
Exploitation: none · Automatable: no · Technical impact: total, assessed 2026-11-07. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
CWE
CWE-354 Improper Validation of Integrity Check Value
Published
Modified
NVD analysis
Awaiting analysis
Record from
the NVD, synced

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Affected

Versions

From the CNA's record in the CVE List.

ProductAffected
JetBrains Ktorbefore 3.6.1

Attack patterns (CAPEC)

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

References

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