CVE-2021-27733

Name: CVE-2021-27733
Creator: NVD / NIST
Published: 2021-05-11T12:15:07.62+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.58%

Last modified Jun 17, 2026

CVE-2021-27733 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. In JetBrains YouTrack before 2020.6.6441, stored XSS was possible via an issue attachment.. EPSS estimates a 0.58% chance of exploitation in the next 30 days.

Description

In JetBrains YouTrack before 2020.6.6441, stored XSS was possible via an issue attachment.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.58%

43.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Jetbrains	Youtrack	< 2020.6.6441

References

https://blog.jetbrains.comVendor Advisory
https://blog.jetbrains.com/blog/2021/05/07/jetbrains-security-bulletin-q1-2021/Vendor Advisory
https://blog.jetbrains.comVendor Advisory
https://blog.jetbrains.com/blog/2021/05/07/jetbrains-security-bulletin-q1-2021/Vendor Advisory

Timeline

Published: May 11, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27733?

In JetBrains YouTrack before 2020.6.6441, stored XSS was possible via an issue attachment.

How severe is CVE-2021-27733?

CVE-2021-27733 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27733?

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-2021-27733?

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

Scan your code now

Source: NVD / NIST