CVE-2025-31139Network attack vector

Credential disclosure via Base64 build-log encoding

Published Mar 27, 2025 · Updated Mar 27, 2025

Sensitive information exposure in JetBrains TeamCity before 2025.03 allows remote authenticated users to read a password from a build log. The affected logging path writes a Base64 encoding of a password to build output; JetBrains has not disclosed the responsible component or operation. Access requires permission to view the affected build log, and the bounded consequence is disclosure of the encoded credential rather than code execution or data modification.

CVSS severity4.3
Medium
EPSS probability1.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive information exposure in JetBrains TeamCity before 2025.03 allows remote authenticated users to read a password from a build log. The affected logging path writes a Base64 encoding of a password to build output; JetBrains has not disclosed the responsible component or operation. Access requires permission to view the affected build log, and the bounded consequence is disclosure of the encoded credential rather than code execution or data modification.

The record

CVE
CVE-2025-31139
Published
Mar 27, 2025
Updated
Mar 27, 2025
Vendor
JetBrains
Product
TeamCity
Classifications
CWE-532, T1552.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 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 <2025.03

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

JetBrains · TeamCityversion=0 <2025.03

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.3JetBrains s.r.o.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/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-532Insertion of Sensitive Information into Log File
T1552.001Unsecured Credentials: Credentials In Files

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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