Outline's Local File Storage Feature can Cause CSP Bypass

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-58351
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-03 04:16:05 UTC
Updated2026-10-19 17:10:00 UTC
DescriptionOutline is a service that allows for collaborative documentation. In versions 0.72.0 through 0.83.0, Outline introduced a feature which facilitates local file system storage capabilities as an optional file storage strategy. This feature allowed a CSP bypass as well as a ContentType bypass that might facilitate further attacks. In the case of self-hosting and using Outline FILE_STORAGE=local on the same domain as the Outline application, a malicious payload can be uploaded as a file attachment and bypass those CSP restrictions, allowing script execution within the context of another user. This is fixed in version 0.84.0.

Risk And Classification

Primary CVSS: v3.1 6.8 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

EPSS: 0.003870000 probability, percentile 0.312750000 (date 2026-10-19)

Problem Types: CWE-79 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N
3.1CNADECLARED6.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Getoutline Outline All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Outline Outline affected >= 0.72.0, < 0.84.0 Not specified

References

ReferenceSourceLinkTags
github.com/outline/outline/commit/18bc93c9c207329244c6909606a2393e863892a3 [email protected] github.com Patch
github.com/outline/outline/security/advisories/GHSA-gcj7-c9jv-fhgf [email protected] github.com Vendor Advisory
github.com/outline/outline/releases/tag/v0.84.0 [email protected] github.com Release Notes
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