CVE-2026-49378Network attack vector

Credential disclosure via parameter autocompletion

Published May 29, 2026 · Updated May 29, 2026

Missing authorization in JetBrains TeamCity On-Premises before 2026.1 allows remote authenticated users to read credentials via autocompletion. The parameter-autocompletion path returns credential-type parameter values without enforcing authorization for the requesting user. Low-privileged TeamCity access is required, and the documented consequence is limited to confidentiality; JetBrains has not disclosed the affected function or endpoint.

CVSS severity4.3
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in JetBrains TeamCity On-Premises before 2026.1 allows remote authenticated users to read credentials via autocompletion. The parameter-autocompletion path returns credential-type parameter values without enforcing authorization for the requesting user. Low-privileged TeamCity access is required, and the documented consequence is limited to confidentiality; JetBrains has not disclosed the affected function or endpoint.

The record

CVE
CVE-2026-49378
Published
May 29, 2026
Updated
May 29, 2026
Vendor
JetBrains
Product
TeamCity On-Premises
Classifications
CWE-862, T1555
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 29, 2026CVE publishedPublication date reported by the CVE source.
  2. May 29, 2026Record 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 <2026.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

JetBrains · TeamCity On-Premisesversion=0 <2026.1

Published CVSS scores

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.

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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-862Missing Authorization
T1555Credentials from Password Stores

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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