SB2020102036 - Cross-site scripting in synapse (Alpine package)

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Main Vulnerability Database SB2020102036

SB2020102036 - Cross-site scripting in synapse (Alpine package)

Published: October 20, 2020

Security Bulletin ID SB2020102036
Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Cross-site scripting (CVE-ID: CVE-2020-26891)

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 passed via "AuthRestServlet" when supplying the victim user with a malicious URL to the /_matrix/client/r0/auth/m.login.recaptcha or /_matrix/client/r0/auth/m.login.terms Synapse 974923. A remote attacker can trick the victim to follow a specially crafted link 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.


Remediation

Install update from vendor's website.

References