CVE-2026-49380Network attack vector

Untrusted-site redirection via undisclosed SAML plugin flaw

Published May 29, 2026 · Updated May 29, 2026

Open redirect in the SAML plugin in JetBrains TeamCity before 2026.1 allows remote attackers to redirect users to untrusted sites. JetBrains has not published the affected request handler, redirect parameter, or the validation operation that accepts the untrusted destination. Exploitation requires user interaction with a crafted request, and the resulting redirect can facilitate phishing without directly disclosing TeamCity data or interrupting the server.

CVSS severity3.1
Low
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in the SAML plugin in JetBrains TeamCity before 2026.1 allows remote attackers to redirect users to untrusted sites. JetBrains has not published the affected request handler, redirect parameter, or the validation operation that accepts the untrusted destination. Exploitation requires user interaction with a crafted request, and the resulting redirect can facilitate phishing without directly disclosing TeamCity data or interrupting the server.

The record

CVE
CVE-2026-49380
Published
May 29, 2026
Updated
May 29, 2026
Vendor
JetBrains
Product
TeamCity On-Premises
Classifications
CWE-601, CAPEC-178, T1204.001
Attack vector
network
Privileges
unauthenticated

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 privilegesunauthenticated

What is affected?

JetBrains · TeamCity On-Premisesversion=0 <2026.1

Published CVSS scores

3.1JetBrains s.r.o.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
CAPEC-178Cross-Site Flashing
T1204.001Malicious Link

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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