TI-2021-13811 Aliases CVE-2021-34817 GHSA-543c-wff7-pg59

A Cross-Site Scripting (XSS) issue in the chat component of Etherpad 1.8.13 allows remote…

LOW 30CWE-79Published 2021-07-19 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

EPSS 0.01343 71st percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:etherpad:etherpad:1.8.13:::::::*	1.8.13	Vulnerable	Etherpad

cpe:2.3:a:etherpad:etherpad:1.8.13:*:*:*:*:*:*:* Versions 1.8.13 Vulnerable ·Etherpad

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-34817
2026-10-03 Alias added: GHSA-543c-wff7-pg59

References

Exploit 1

https://github.com/ether/etherpad-lite/commit/a7968115581e20ef47a533e030f59f830486bdfa

Patch 2

Advisory 1

https://blog.sonarsource.com/etherpad-code-execution-vulnerabilities

TI-2021-19608 Admin privilege escalation and arbitrary code execution via malicious *.etherpad imports CVSS 3.1CRITICAL 9.9
TI-2018-06747 Etherpad 1.6.3 before 1.6.4 allows an attacker to execute arbitrary code. CVSS 3.0CRITICAL 9.8
TI-2018-04991 node/hooks/express/apicalls.js in Etherpad Lite before v1.6.3 mishandles JSONP, which… CVSS 3.0CRITICAL 9.8
TI-2015-02917 Directory traversal vulnerability in node/utils/Minify.js in Etherpad 1.1.1 through 1.5.2… CVSS 3.0HIGH 7.5
TI-2018-06748 Etherpad 1.5.x and 1.6.x before 1.6.4 allows an attacker to execute arbitrary code on the… CVSS 3.0HIGH 8.1
TI-2015-03442 Directory traversal vulnerability in node/hooks/express/tests.js in Etherpad frontend tests before 1.6.1. CVSS 3.0HIGH 7.5

See all 15 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences