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TI-2026-26137 Aliases CVE-2026-33758GHSA-cpj3-3r2f-xj59

OpenBao has Reflected XSS in its OIDC authentication error message

Priority MEDIUM 42CWE-116Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

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`.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00298 22nd percentileScored 2026-11-07
Fix Fixed openbao (openbao): 2.5.2github.com/openbao/openbao (Go): 0.0.0-20260325133417-6e2b2dd84f0e

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
openbaoopenbaobefore 2.5.22.5.2Patch availableCNA
—github.com/openbao/openbao (Go)before 0.0.0-20260325133417-6e2b2dd84f0e0.0.0-20260325133417-6e2b2dd84f0ePatch availableGHSA-cpj3-3r2f-xj59
  • openbao Vendoropenbao Affected before 2.5.2 Fixed in 2.5.2 Patch available CNA
  • github.com/openbao/openbao (Go) Vendor— Affected before 0.0.0-20260325133417-6e2b2dd84f0e Fixed in 0.0.0-20260325133417-6e2b2dd84f0e Patch available GHSA-cpj3-3r2f-xj59

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:openbao:openbao:*:*:*:*:*:*:*:*before 2.5.2Vulnerableopenbao
  • cpe:2.3:a:openbao:openbao:*:*:*:*:*:*:*:* Versions before 2.5.2 Vulnerable ·openbao

Remediation

  • Fix · CNA openbao (openbao) Fixed in 2.5.2
  • Fix · GHSA-cpj3-3r2f-xj59 github.com/openbao/openbao (Go) Fixed in 0.0.0-20260325133417-6e2b2dd84f0e Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Not affected: 1 product
  • Cryostat 4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33758
  2. 2026-10-03 Alias added: GHSA-cpj3-3r2f-xj59

References

Patch 2

Advisory 2

Other 2

  • TI-2024-01904 Vault Cert Auth Method Did Not Correctly Validate Non-CA Certificates CVSS 3.1CRITICAL 9.8
  • TI-2026-28381 OpenBao has Decompression Bomb via Unbounded Copy in OCI Plugin Extraction (DoS) CVSS 3.1MEDIUM 6.5
  • TI-2026-26136 OpenBao lacks user confirmation for OIDC direct callback mode CVSS 3.1CRITICAL 9.6
  • TI-2025-34701 OpenBao: Privileged Operator May Execute Code on the Underlying Host CVSS 3.1CRITICAL 9.1
  • TI-2025-36685 OpenBao vulnerable to denial of service via malicious JSON request processing CVSS 3.1HIGH 7.5
  • TI-2024-07039 Vault SSH Secrets Engine Configuration Did Not Restrict Valid Principals By Default CVSS 3.1HIGH 8.8
See all 24 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences