CVE-2023-34228Network attack vector

Unauthorized sensitive account actions via missing 2FA checks

Published May 31, 2023 · Updated Jan 9, 2025

Authentication bypass in JetBrains TeamCity before 2023.05 allows remote authenticated users to perform sensitive account actions without 2FA. JetBrains has not published which account-action handlers omit the second-factor check or which operations they accept. A valid account with 2FA enabled is required; the flaw bypasses only the second factor and permits unauthorized sensitive account actions.

CVSS severity5.3
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in JetBrains TeamCity before 2023.05 allows remote authenticated users to perform sensitive account actions without 2FA. JetBrains has not published which account-action handlers omit the second-factor check or which operations they accept. A valid account with 2FA enabled is required; the flaw bypasses only the second factor and permits unauthorized sensitive account actions.

The record

CVE
CVE-2023-34228
Published
May 31, 2023
Updated
Jan 9, 2025
Vendor
JetBrains
Product
TeamCity
Classifications
CWE-308, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 31, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 9, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2023.05

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

JetBrains · TeamCityversion=0 <2023.05

Published CVSS scores

5.3JetBrains s.r.o.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-308Use of Single-factor Authentication
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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