# CVE-2026-126311: OpenBao before 2.6.5 and 2.7.2 Wildcard Principals in SSH Certificates via Identity Templates

Status: published. Published: 2026-11-13. Updated: 2026-11-13.

OpenBao before 2.6.5 and 2.7.x before 2.7.2 does not neutralize wildcard characters in SSH certificate principals rendered from unvalidated external token metadata via identity templates in the SSH secrets engine. Attackers controlling that metadata, typically through a compromised identity provider, can inject '*' to obtain SSH certificates valid for multiple hosts or users.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- openbao / openbao (github.com/openbao/openbao/v2): ≥ 0; < 2.6.5 (affected, semver); 2.6.5 (unaffected, semver); ≥ 2.7.0; < 2.7.2 (affected, semver); 2.7.2 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 4.6 (medium); CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 5.8 (medium); CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N; source: CNA: VulnCheck

- CVSS 4.0: 4.6 (medium); CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 5.8 (medium); CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-155

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/openbao/openbao/security/advisories/GHSA-h76r-48x5-36hg (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/openbao-before-2.6.5-and-2.7.2-wildcard-principals-in-ssh-certificates-via-identity-templates (CNA: VulnCheck; third-party-advisory)

- https://github.com/openbao/openbao/security/advisories/GHSA-h76r-48x5-36hg (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/openbao-before-2.6.5-and-2.7.2-wildcard-principals-in-ssh-certificates-via-identity-templates (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-126311; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-126311; retrieved 2026-11-13; source updated 2026-11-13

Revision: 75c154b1feb7c5d0aa902b0ff06630f0ec530504cc7811d6cb9af38e53267feb

Canonical: https://y2.dev/cve/CVE-2026-126311

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