In JetBrains IntelliJ IDEA before 2026.3 blind SSRF was possible via remote references in JSON Schema validation
- 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? →
- 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
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
JetBrains IntelliJ IDEA versions before 2026.3 are affected by a blind server-side request forgery flaw in JSON Schema validation, where remote references are processed. An attacker can reach it remotely without logging in, but a user must take an action, and the attacker can use the IDE to make outbound requests, though they cannot read the responses.
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 blind SSRF was possible via remote references in JSON Schema validation
cve.now Index
- Exploitation0/40No signal
- Exposure7/25Reachable over the network without a login · Unknown: No advisory context yet
- Reach?/20Unknown. No tracked technology or package matched
- Severity4.3/10CVSS 4.3
- 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 26 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: partial
- 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-2026-123846
Is CVE-2026-123846 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-2026-123846?
IntelliJ IDEA: before 2026.3.Source: cve.now feed data
How do I fix CVE-2026-123846?
Upgrade to a fixed version: 2026.3.Source: cve.now feed data