---
id: "CVE-2026-123846"
page: "https://infrastack.ai/live/CVE-2026-123846"
kind: "vulnerability"
aliases: ["CVE-2026-123846"]
title: "JetBrains IntelliJ IDEA: blind SSRF via remote JSON Schema references"
severity: "medium"
cvss: 4.3
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["developer-tools", "intellij-idea", "jetbrains", "json-schema", "package"]
not_affected_if: ["trusted-schemas-only", "version-2026.3-or-later"]
published_at: "2026-11-06T17:17:23+00:00"
first_seen_at: "2026-11-06T17:43:13+00:00"
updated_at: "2026-11-06T17:45:40+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123846", "first_seen_at": "2026-11-06T17:43:13+00:00"}]
exploit_sources: []
---

# JetBrains IntelliJ IDEA: blind SSRF via remote JSON Schema references

Link for people: https://infrastack.ai/live/CVE-2026-123846 (this .md is for agents)

Before IntelliJ IDEA 2026.3, JSON Schema validation followed remote references, so a crafted schema could make the IDE send requests to hosts an attacker chooses. The attacker gets a blind server-side request forgery, meaning they can trigger requests from the developer's machine but not read the responses.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the IntelliJ IDEA version under Help > About, or run `idea.sh --version` on Linux or macOS
- Confirm whether the installed version is earlier than `2026.3`

## Fix

- IntelliJ IDEA: move to `2026.3` or later

## Timeline

- 2026-11-06T17:43:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123846

## From the sources

In JetBrains IntelliJ IDEA before 2026.3 blind SSRF was possible via remote references in JSON Schema validation

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_