CSP and ContentType Bypass in Outline Document Collaboration Service
CVE-2025-58351

6.8MEDIUM

Key Information:

Vendor

Outline

Status
Outline
Vendor
CVE Published:
3 September 2025

What is CVE-2025-58351?

Outline, a collaborative documentation service, contains a vulnerability resulting from a feature that allows local file system storage, introduced in versions 0.72.0 through 0.83.0. This feature inadvertently allows for a Content Security Policy (CSP) bypass as well as a ContentType bypass, which an attacker could exploit. When self-hosting Outline with the local file storage setting enabled, it is possible for a malicious user to upload harmful files. This could lead to script execution in the context of another user, potentially exposing sensitive data or compromising user accounts. The issue has been addressed in version 0.84.0.

Affected Version(s)

outline >= 0.72.0, < 0.84.0

References

https://github.com/outline/outline/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/outline/outline/commit/18bc93c9c207329...
x_refsource_MISC
https://github.com/outline/outline/releases/tag/v0.84.0
x_refsource_MISC

CVSS V3.1

Score:
6.8
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.
CVE-2025-58351 : CSP and ContentType Bypass in Outline Document Collaboration Service