In JetBrains IntelliJ IDEA before 2026.3 host name verification was missing for server TLS certificates
- Exploited
- No known exploitation
- Fix
- Fixed in 2026.3
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 2026.3.
- 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? →
- 25/100 · 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
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
JetBrains IntelliJ IDEA is affected because it does not check that a server's TLS certificate matches the host it connects to. A remote attacker who can sit between the IDE and that server, without logging in or any user action, could potentially intercept or alter the traffic, which may expose confidential data.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
In JetBrains IntelliJ IDEA before 2026.3 host name verification was missing for server TLS certificates
cve.now Index
- Exploitation0/40No signal
- Exposure17/25No login or user action needed per the CVSS vector, reachable over the network without a login · Unknown: No advisory context yet
- Reach?/20Unknown. No tracked technology or package matched
- Severity8.4/10CVSS 7.4, total technical impact per CISA
- No patch0/5No signal
What would change the score
- Would score about 70 if added to CISA KEV
- Would score about 65 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: 2026.3.
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- JetBrains IntelliJ IDEA
fixed in 2026.3
Evidence 1
- Link
Corrections
None so far.
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Questions about CVE-2026-123848
Is CVE-2026-123848 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-2026-123848?
IntelliJ IDEA: before 2026.3.Source: cve.now feed data
How do I fix CVE-2026-123848?
Upgrade to a fixed version: 2026.3.Source: cve.now feed data