What’s Vulnerable › Vulnerabilities

CVE-2021-31903

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-11 · updated 2026-06-17
• Weakness: CWE-79

Description

In JetBrains YouTrack before 2021.1.9819, a pull request's title was sanitized insufficiently, leading to XSS.

Affected products

• JetBrains YouTrack: before 2021.1.9819 — fixed in 2021.1.9819

How to fix

Upgrade to a fixed version: JetBrains YouTrack 2021.1.9819. Check the vendor advisory for mitigations.

References

• https://blog.jetbrains.com
• https://blog.jetbrains.com/blog/2021/05/07/jetbrains-security-bulletin-q1-2021/
• https://blog.jetbrains.com
• https://blog.jetbrains.com/blog/2021/05/07/jetbrains-security-bulletin-q1-2021/

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