SB2026092232 - Cross-site scripting in Etherpad

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Main Vulnerability Database SB2026092232

SB2026092232 - Cross-site scripting in Etherpad

Published: September 22, 2026

Security Bulletin ID SB2026092232
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Cross-site scripting (CVE-ID: N/A)

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

CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]


The vulnerability allows a remote attacker to execute arbitrary script in a consumer's origin.

The vulnerability exists due to improper neutralization of input during web page generation in the author colors branch of getHTMLFromAtext when exporting diff HTML. A remote attacker can import a crafted .etherpad file to inject arbitrary HTML or script into the exported diff HTML.

User interaction is required because a consumer must render the exported diff HTML.


Remediation

Install update from vendor's website.

References