Security readout for executives and security teams
Plain-English summary
CVE-2019-12842 is a reflected cross-site scripting issue in JetBrains TeamCity. A vulnerable TeamCity page could run attacker-controlled script in a user's browser. JetBrains says the issue was fixed in TeamCity 2018.2.2. The public bundle does not provide CVSS, authentication context, or detailed affected version ranges.
Executive priority
Address during normal vulnerability remediation unless the TeamCity instance is internet-facing or business-critical. The known fix is old, so unpatched exposure mainly indicates patch-management debt around a development infrastructure system.
Technical view
The CVE describes reflected XSS on a TeamCity user page. The available record names TeamCity 2018.2.2 as the fix release, but does not include CVSS metrics, CWE mapping, exploit prerequisites, or precise vulnerable versions. Treat pre-fix TeamCity deployments as candidates for review.
Likely exposure
Exposure is most likely in JetBrains TeamCity instances that have not been updated to the 2018.2.2 fix level. Risk is higher where TeamCity is reachable by many users or from the internet. The source bundle does not state whether authentication is required.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not listed as KEV. Reflected XSS commonly depends on getting a target user to interact with attacker-controlled content, but the exact trigger conditions are not disclosed here.
Researcher notes
Public detail is sparse. Do not assume affected version ranges beyond the stated TeamCity 2018.2.2 fix. Validation should focus on version evidence, exposure path, and whether compensating access controls reduce browser-based attack opportunity.
Mitigation direction
- Upgrade TeamCity to 2018.2.2 or a later vendor-supported release.
- Review JetBrains security guidance for any additional vendor instructions.
- Restrict TeamCity access to trusted networks and users where feasible.
- Prioritize upgrades for externally reachable TeamCity deployments.
Validation and detection
- Inventory TeamCity instances and record their running versions.
- Confirm each instance is at least TeamCity 2018.2.2.
- Check whether TeamCity is internet-facing or broadly reachable internally.
- Review web access logs for suspicious requests to user-related TeamCity pages.
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-2019-12842 mapping review
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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/blog/2019/06/19/jetbrains-security-bulletin-q1-2019/CVE reference · x_refsource_CONFIRM
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.