CVE-2026-33758 (GCVE-0-2026-33758)
Vulnerability from cvelistv5 – Published: 2026-03-27 14:12 – Updated: 2026-07-15 01:06
VLAI
EPSS
VEX
Title
OpenBao has Reflected XSS in its OIDC authentication error message
Summary
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`.
Severity
9.6 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-27 18:55 UTC
CWE
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/openbao/openbao/security/advis… | x_refsource_CONFIRM |
| https://github.com/openbao/openbao/pull/2709 | x_refsource_MISC |
| https://github.com/openbao/openbao/commit/6e2b2dd… | x_refsource_MISC |
| https://github.com/openbao/openbao/releases/tag/v2.5.2 | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2026-33758 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2452294 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| openbao | openbao |
Affected:
< 2.5.2
|
guessed | |
| Red Hat | Cryostat 4 |
cpe:/a:redhat:cryostat:4
|
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"url": "https://github.com/openbao/openbao/commit/6e2b2dd84f0e47cebc90d6e79609dd5274732662"
},
{
"name": "https://github.com/openbao/openbao/releases/tag/v2.5.2",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/openbao/openbao/releases/tag/v2.5.2"
}
],
"source": {
"advisory": "GHSA-cpj3-3r2f-xj59",
"discovery": "UNKNOWN"
},
"title": "OpenBao has Reflected XSS in its OIDC authentication error message"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-33758",
"datePublished": "2026-03-27T14:12:33.941Z",
"dateReserved": "2026-03-23T18:30:14.125Z",
"dateUpdated": "2026-03-27T19:58:18.047Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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