Outline
CVE-2024-40626
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 5.4 (MEDIUM). Attack characteristics: network attack vector, low complexity, low privileges required, user interaction required. Public proof-of-concept exploit code is available. |
| Exploit ScenarioDerived | A remote attacker could inject malicious scripts into web pages viewed by other users by sending crafted requests to the affected application. |
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Alert meAnalysisAI
Outline is an open source, collaborative document editor. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.
Affects your stack
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Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
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 an open source, collaborative document editor. A type confusion issue was found in ProseMirror’s rendering process that leads to a Stored Cross-Site Scripting (XSS) vulnerability in Outline. An authenticated user can create a document containing a malicious JavaScript payload. When other users view this document, the malicious Javascript can execute in the origin of Outline. Outline includes CSP rules to prevent third-party code execution, however in the case of self-hosting and having your file storage on the same domain as Outline a malicious payload can be uploaded as a file attachment and bypass those CSP restrictions. This issue has been addressed in release version 0.77.3. Users are advised to upgrade. There are no known workarounds for this vulnerability. Affected products include: Getoutline Outline. Version information: version 0.77.3..
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
Outline is an open source, collaborative document editor. A type confusion issue was found in ProseMirror’s rendering process that leads to a Stored Cross-Site Scripting (XSS) vulnerability in Outline. An authenticated user can create a document containing a malicious JavaScript payload. When other users view this document, the malicious Javascript can execute in the origin of Outline. Outline includes CSP rules to prevent third-party code execution, however in the case of self-hosting and having your file storage on the same domain as Outline a malicious payload can be uploaded as a file attachment and bypass those CSP restrictions. This issue has been addressed in release version 0.77.3. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.
Affected Products (CPE)NVD
An issue in Outline <= v0.76.1 allows attackers to execute a session hijacking attack via user interaction with a crafte
Outline versions up to - contains a vulnerability that allows attackers to potentially execute arbitrary code with eleva
An issue in Outline <= v0.76.1 allows attackers to redirect a victim user to a malicious site via intercepting and chang
Outline versions prior to 1.4.0 fail to validate attachment file paths during JSON import, allowing authenticated attack
Cross-site Scripting (XSS) - Stored in GitHub repository outline/outline prior to 0.70.1. Rated medium severity (CVSS 5.
Cross-site Scripting (XSS) - Stored in GitHub repository outline/outline prior to v0.64.4. Rated medium severity (CVSS 5
Account takeover in Outline collaborative documentation service versions 0.86.0 through 1.5.x enables unauthenticated at
Zip extraction sandbox escape in Outline (self-hosted collaborative knowledge base) before 1.7.0 lets an authenticated u
Privilege escalation in Outline (the collaborative wiki/knowledge-base) versions 0.84.0 through 1.6.1 lets a malicious O
An Insecure Direct Object Reference (IDOR) vulnerability in Outline's document restoration logic allows any authenticate
Broken object-level authorization in Outline (self-hosted collaborative documentation) versions 0.84.0 through 1.7.0 let
Cross-workspace document disclosure in Outline (getoutline) versions 0.86.0 through 1.6.x lets an authenticated user min
Exploit-DB