Security readout for executives and security teams
Plain-English summary
CVE-2021-31904 is a potential cross-site scripting issue in JetBrains TeamCity before 2020.2.2 on the test history page. The public record does not provide severity, CVSS, affected deployment details, or exploitation evidence. Treat it as a hygiene and access-control risk for older TeamCity servers.
Executive priority
Prioritize remediation if TeamCity is business-critical, internet-accessible, or used by many developers. The issue is not documented as actively exploited in the provided sources, but CI systems are sensitive because they often connect to code, credentials, and deployment workflows.
Technical view
The vulnerability is described only as potential XSS on TeamCity's test history page before version 2020.2.2. Available sources do not state whether authentication is required, whether the issue is stored or reflected, or what input path is involved. No CWE or CVSS data is provided.
Likely exposure
Exposure is likely limited to organizations running JetBrains TeamCity versions before 2020.2.2, especially where users can access the test history page. The source bundle does not identify affected editions, configurations, or internet-exposed scenarios.
Exploitation context
The CVE is not listed as KEV in the provided bundle, and no cited source states active exploitation. Public details are sparse, so exploitability and attack prerequisites cannot be confirmed from the supplied evidence.
Researcher notes
Key missing details include CVSS score, CWE classification, authentication requirement, XSS type, affected parameter, and exploit prerequisites. Use vendor advisory and CVE records as the baseline, and avoid assuming broader TeamCity impact beyond versions before 2020.2.2.
Mitigation direction
- Identify any TeamCity instances running versions before 2020.2.2.
- Upgrade affected TeamCity deployments to 2020.2.2 or a later supported version.
- Review JetBrains security guidance for any additional vendor-recommended actions.
- Restrict TeamCity access to trusted users and networks where possible.
Validation and detection
- Inventory TeamCity versions across production, staging, and CI infrastructure.
- Confirm whether any server is older than TeamCity 2020.2.2.
- Verify access controls around TeamCity test history pages.
- Review web and TeamCity logs for unusual activity if older versions were exposed.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-31904 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://blog.jetbrains.com/CVE reference · x_refsource_MISC
- https://blog.jetbrains.com/blog/2021/05/07/jetbrains-security-bulletin-q1-2021/CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.