What’s Vulnerable › Vulnerabilities

CVE-2026-25062: Outline Affected an Arbitrary File Read via Path Traversal in JSON Import

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-11 · updated 2026-06-17
• Weakness: CWE-22

Description

Outline is a service that allows for collaborative documentation. Prior to 1.4.0, during the JSON import process, the value of attachments[].key from the imported JSON is passed directly to path.join(rootPath, node.key) and then read using fs.readFile without validation. By embedding path traversal sequences such as ../ or absolute paths, an attacker can read arbitrary files on the server and import them as attachments. This vulnerability is fixed in 1.4.0.

Affected products

• outline: before 1.4.0 — fixed in 1.4.0

How to fix

Upgrade to a fixed version: outline 1.4.0. Check the vendor advisory for mitigations.

References

• https://github.com/outline/outline/releases/tag/v1.4.0
• https://github.com/outline/outline/security/advisories/GHSA-7r4f-3wjv-83xf

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