SB2021010408 - Multiple vulnerabilities in HedgeDoc

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Main Vulnerability Database SB2021010408

SB2021010408 - Multiple vulnerabilities in HedgeDoc

Published: January 4, 2021

Security Bulletin ID SB2021010408
Severity
High
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Stored cross-site scripting (CVE-ID: CVE-2020-26287)

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data within mermaid diagrams. A remote attacker can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.


2) Arbitrary file upload (CVE-ID: CVE-2020-26286)

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insufficient validation of file during file upload. A remote attacker can upload a malicious file and execute it on the server.


Remediation

Install update from vendor's website.

References