OfficialCISA Known Exploited Vulnerabilities
JetBrains TeamCity Relative Path Traversal VulnerabilityType Vulnerability
JetBrains · Auth bypass
JetBrains TeamCity Authentication Bypass Vulnerability
At a glance
Medium
7-day window, from the last update
ActiveConfirmed in-the-wild exploitation
Evidence-weighted, not popularity
Signal
Actively exploited in the wild — prioritise confirming exposure.
Why Medium
Medium rather than High: exposure is scored at a default because we cannot see your systems or suppliers. If you run or depend on JetBrains TeamCity, treat it as High.
Briefing
There is no written leader briefing for this story yet. These questions come from the facts we hold.
Questions to ask IT
- Do we run JetBrains TeamCity, and which versions?
- Is any of it reachable from the internet?
- Have we checked whether it has already been used against us?
- If it is not yet patched, what mitigation is in place, and will the fix be done by 12 Nov?
Next steps
- Confirm exposure and remediation status for affected products
Vulnerability facts
Full CVE detail CVE-2024-27198- 9.8 · CriticalExploitable over the network without any account, and no one has to click or open anything. High impact on confidentiality, integrity and availability.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Listed: attacks using it have been seen
- Elevated attack likelihood (~99.9% in 30 days)
- Before 2023.11.4
- 2023.11.4
These facts are for CVE-2024-27198. This event covers 1 more CVE, each with its own record. Versions are as the CVE record states them; check the vendor advisory before planning a fix.
No technical write-up beyond these facts and the summary below yet.
Next steps
- Confirm whether affected products/versions are present and prioritise patching or mitigations
Summary
- JetBrains TeamCity contains a relative path traversal vulnerability that could allow limited admin actions to be performed.
- CVE-2024-27198 has an estimated attack likelihood score of 0.999 (~99.9% estimated chance of exploitation in the next 30 days; 100th percentile) as of 2026-09-28. This is a probability signal from FIRST, not confirmed exploitation.
- CVE-2024-27198 is confirmed as exploited in the wild (US known-exploited catalogue)
- Authoritative catalogues report active exploitation of this vulnerability.
Products and services involved
- JetBrains TeamCity90% match confidence · CVE-2024-27198
17 reports
Part of Fortinet FortiManager Missing Authentication Vulnerability
- Fortinet FortiManager Missing Authentication Vulnerability
- Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability
- SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel Vulnerability
- SmarterTools SmarterMail Missing Authentication Vulnerability
Same event, different frames
Distinct often headline the same incident differently.
OfficialFIRST EPSS
CVE-2024-27198: elevated exploitation probabilityPulse
Last checked 2h ago · Next recheck 10 Nov 2026, 13:03 UK time · 2 quiet checks collapsed
Signal
9 Nov 2026, 13:03 UK time · 2h ago
in the next 30 days first recorded at 100.0% (elevated likelihood signal, not confirmed exploitation).
Elevated — confirm exposure; this is a probability signal, not confirmed exploitation.
Drag to pan · Ctrl / ⌘ + scroll or pinch to zoom10 events
2 quiet checks hidden.
Sources
JetBrains TeamCity Relative Path Traversal Vulnerability
CVE-2024-27198: elevated exploitation probability
How we know
Statements extracted from sources. Higher confidence means stronger corroboration.
- ClaimedHeadline60% confidence
JetBrains TeamCity Authentication Bypass Vulnerability
- ProbableSummary fact75% confidence
CVE-2024-27198 has an estimated attack likelihood score of 0.999 (~99.9% estimated chance of exploitation in the next 30 days; 100th percentile) as of 2026-09-28. This is a probability signal from FIRST, not confirmed exploitation.
- ConfirmedCVE identifier95% confidence
Event involves CVE-2024-27198
- ConfirmedKnown-exploited catalogue98% confidence
CVE-2024-27198 is confirmed as exploited in the wild (US known-exploited catalogue)