EUVD-2026-33384
GHSA-qhvc-3ggx-6rj7
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Lifecycle Timeline
3DescriptionCVE.org
In JetBrains TeamCity before 2026.1 insufficient username validation in the SAML plugin
AnalysisAI
Insufficient username validation in the SAML plugin of JetBrains TeamCity before 2026.1 allows unauthenticated remote attackers to bypass authentication controls and gain unauthorized access to CI/CD resources. The flaw (CWE-863, Incorrect Authorization) permits manipulation of the username field within SAML assertions, potentially enabling impersonation of legitimate users and unauthorized read/write access to build configurations and pipeline data. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the SAML SSO plugin to be enabled and actively configured in the TeamCity instance - this is not the default authentication mode and must be explicitly set up by administrators. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 6.5 (Medium) score is underpinned by a vector of AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - network-accessible, low complexity, requiring no privileges or user interaction, with partial confidentiality and integrity impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with network access to a TeamCity instance configured with SAML SSO crafts a SAML assertion containing a manipulated username attribute - either by acting as a rogue IdP trusted by the target or by intercepting and modifying an IdP response. TeamCity's SAML plugin fails to sufficiently validate the username, accepting the assertion and granting the attacker access as the impersonated user, potentially a project administrator with access to build pipelines, secrets, and source integrations. … |
| Remediation | Upgrade JetBrains TeamCity to version 2026.1 or later, which resolves the insufficient username validation in the SAML plugin. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-863 – Incorrect Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today