CVE-2021-42088

Name: CVE-2021-42088
Creator: NVD / NIST
Published: 2021-10-07T21:15:07.587+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.63%

Last modified Jun 17, 2026

CVE-2021-42088 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. An issue was discovered in Zammad before 4.1.1. The Chat functionality allows XSS because clipboard data is mishandled.. EPSS estimates a 0.63% chance of exploitation in the next 30 days.

Description

An issue was discovered in Zammad before 4.1.1. The Chat functionality allows XSS because clipboard data is mishandled.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.63%

45.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Zammad	Zammad	< 4.1.1

References

https://zammad.com/en/advisories/zaa-2021-12Vendor Advisory
https://zammad.com/en/advisories/zaa-2021-12Vendor Advisory

Timeline

Published: Oct 7, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-42088?

An issue was discovered in Zammad before 4.1.1. The Chat functionality allows XSS because clipboard data is mishandled.

How severe is CVE-2021-42088?

CVE-2021-42088 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.63% probability of exploitation in the next 30 days.

How do I fix CVE-2021-42088?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-42088?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST