What’s Vulnerable › Vulnerabilities

CVE-2021-31913

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% 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-354

Description

In JetBrains TeamCity before 2020.2.3, insufficient checks of the redirect_uri were made during GitHub SSO token exchange.

Affected products

• JetBrains TeamCity: before 2020.2.3 — fixed in 2020.2.3

How to fix

Upgrade to a fixed version: JetBrains TeamCity 2020.2.3. 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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