What is the CVSS score of CVE-2025-58351?

CVE-2025-58351 has a CVSS 3.1 base score of 6.8 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N. EPSS exploitation probability: 0.0%.

Which versions of Outline are affected by CVE-2025-58351?

Organizations using versions 0.72.0 should be aware of notable risk from CVE-2025-58351, a cross-site scripting vulnerability rated CVSS 6.8.. A patch is available.

How to fix or mitigate CVE-2025-58351?

Within 30 days: Identify affected systems running versions 0.72.0 and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Outline CVE-2025-58351

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2025-09-03 security-advisories@github.com

XSS Outline

6.8

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.8 MEDIUM

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:10 vuln.today

Patch released

Mar 28, 2026 - 19:10 nvd

Patch available

CVE Published

Sep 03, 2025 - 04:16 nvd

MEDIUM 6.8

DescriptionGitHub Advisory

Outline 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.

AnalysisAI

Outline is a service that allows for collaborative documentation. Rated medium severity (CVSS 6.8), this vulnerability is remotely exploitable, low attack complexity. This Cross-Site Scripting (XSS) vulnerability could allow attackers to inject malicious scripts into web pages viewed by other users.

Technical ContextAI

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. Outline 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. Affected products include: Getoutline Outline. Version information: through 0.83.0.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

CVE-2025-58351 vulnerability details – vuln.today

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