Vulnerability Details CVE-2026-33758
OpenBao is an open source identity-based secrets management system. Prior to version 2.5.2, OpenBao installations that have an OIDC/JWT authentication method enabled and a role with `callback_mode=direct` configured are vulnerable to XSS via the `error_description` parameter on the page for a failed authentication. This allows an attacker access to the token used in the Web UI by a victim. The `error_description` parameter has been replaced with a static error message in v2.5.2. The vulnerability can be mitigated by removing any roles with `callback_mode` set to `direct`.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 34.9%
CVSS Severity
CVSS v3 Score 6.1
References
Products affected by CVE-2026-33758
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cpe:2.3:a:openbao:openbao:-
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cpe:2.3:a:openbao:openbao:2.0.0
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cpe:2.3:a:openbao:openbao:2.0.1
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cpe:2.3:a:openbao:openbao:2.0.2
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cpe:2.3:a:openbao:openbao:2.0.3
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cpe:2.3:a:openbao:openbao:2.1.0
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cpe:2.3:a:openbao:openbao:2.1.1
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cpe:2.3:a:openbao:openbao:2.2.0
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cpe:2.3:a:openbao:openbao:2.2.1
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cpe:2.3:a:openbao:openbao:2.2.2
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cpe:2.3:a:openbao:openbao:2.3.0
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cpe:2.3:a:openbao:openbao:2.3.1
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cpe:2.3:a:openbao:openbao:2.3.2
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cpe:2.3:a:openbao:openbao:2.4.0
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cpe:2.3:a:openbao:openbao:2.4.1