CVE-2026-33758: OpenBao is an open source identity-based secrets management system

Q: How do I fix CVE-2026-33758?

openbao: upgrade to 2.5.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-33758 being exploited?

CVE-2026-33758 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33758 affect?

CVE-2026-33758 affects openbao. Severity is medium (CVSS 6.1). 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 vi

Q: How urgent is CVE-2026-33758?

Priority 27/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2026-33758 is a medium-severity flaw (CVSS 6.1) affecting openbao. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-20, CWE-79, CWE-116
Published	2026-03-27
Last modified	2026-07-15

Publisher (CNA): GitHub, Inc. · Vendor: openbao

Last updated 2026-07-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-27 15:16 UTCPublished CVE record published
2026-07-15 02:20 UTCUpdated Record last modified

openbao openbao UPGRADE

Affected: < 2.5.2

Fixed in: 2.5.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy openbao || rpm -q openbao || openbao --version

2. UPGRADE to 2.5.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade openbao

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openbao

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33758?

openbao: upgrade to 2.5.2. Exact commands for each OS are on this page.

Is CVE-2026-33758 being exploited?

CVE-2026-33758 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33758 affect?

CVE-2026-33758 affects openbao. Severity is medium (CVSS 6.1). 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 vi

How urgent is CVE-2026-33758?

Priority 27/100. No elevated risk signals yet.

Related CVEs

CVE-2026-33757 CRITICAL 9.6 UPGRADE OpenBao is an open source identity-based secrets management system
CVE-2026-42186 HIGH 7.5 UPGRADE OpenBao is an open source identity-based secrets management system
CVE-2026-40264 LOW 2.7 UPGRADE OpenBao is an open source identity-based secrets management system
CVE-2026-39946 MEDIUM 4.9 UPGRADE OpenBao is an open source identity-based secrets management system
CVE-2026-39396 LOW 3.1 UPGRADE OpenBao is an open source identity-based secrets management system

References

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