CVE-2026-123317EUVD-2026-118081GHSA-76H9-4MX5-8C9V
In JetBrains Ktor before 3.6.1 session forgery was possible via tampered encrypted session cookies
A 0-10 score for how bad the bug is in the worst case. It does not say how common the affected setup is.What do these mean? →8.1HighCNA
- Exploited
- No known exploitation
- Fix
- Fixed in 3.6.1
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 3.6.1.
- Last modified
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 11/100 · provisional
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In JetBrains Ktor before 3.6.1 session forgery was possible via tampered encrypted session cookies
cve.now Index
11Pcve.now Index 11 of 100 · methodology v3 · provisional
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure3/25Reachable over the network · Unknown: No advisory context yet
- Reach?/20Unknown. No tracked technology or package matched
- Severity8.1/10CVSS 8.1
- No patch0/5No signal
What would change the score
- Would score about 66 if added to CISA KEV
- Would score about 61 if CISA's SSVC rates exploitation active
- Would score about 30 if advisories confirm default setups are exposed
What to do
Upgrade to a fixed version: 3.6.1.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- JetBrains Ktor
fixed in 3.6.1
Evidence 1
- Link
Corrections
None so far.
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Questions about CVE-2026-123317
Is CVE-2026-123317 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
Which versions are affected by CVE-2026-123317?
Ktor: before 3.6.1.Source: cve.now feed data
How do I fix CVE-2026-123317?
Upgrade to a fixed version: 3.6.1.Source: cve.now feed data