What’s Vulnerable › Vulnerabilities

CVE-2021-34817

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-07-19 · updated 2026-06-17
• Weakness: CWE-79

Description

A Cross-Site Scripting (XSS) issue in the chat component of Etherpad 1.8.13 allows remote attackers to inject arbitrary JavaScript or HTML by importing a crafted pad.

Affected products

• etherpad-lite: 1.8.13

References

• https://blog.sonarsource.com/etherpad-code-execution-vulnerabilities
• https://etherpad.org/#download
• https://github.com/ether/etherpad-lite/commit/a7968115581e20ef47a533e030f59f830486bdfa
• https://github.com/ether/etherpad-lite/releases/tag/1.8.14
• https://blog.sonarsource.com/etherpad-code-execution-vulnerabilities
• https://etherpad.org/#download
• https://github.com/ether/etherpad-lite/commit/a7968115581e20ef47a533e030f59f830486bdfa
• https://github.com/ether/etherpad-lite/releases/tag/1.8.14

Get alerted when CVE-2021-34817 or the next vulnerability affects your stack