---
id: "CVE-2026-126310"
page: "https://infrastack.ai/live/CVE-2026-126310"
kind: "vulnerability"
aliases: ["CVE-2026-126310"]
title: "OpenBao: unauthenticated callers can obtain OIDC ID tokens via public clients"
severity: "high"
cvss: 8.7
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "OpenBao", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["infrastructure", "oidc", "openbao", "self-hosted"]
not_affected_if: ["no-public-clients", "oidc-provider-unused"]
published_at: "2026-11-13T10:17:36+00:00"
first_seen_at: "2026-11-13T10:47:15+00:00"
updated_at: "2026-11-13T10:50:23+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126310", "first_seen_at": "2026-11-13T10:47:15+00:00"}]
exploit_sources: []
---

# OpenBao: unauthenticated callers can obtain OIDC ID tokens via public clients

Link for people: https://infrastack.ai/live/CVE-2026-126310 (this .md is for agents)

OpenBao before 2.6.5 and 2.7.2 lets anyone who knows a public OIDC client's client_id request ID tokens from the identity/oidc/provider token endpoint without a secret. An attacker can impersonate that client and obtain identity tokens they are not entitled to.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:OpenBao affected range not listed fixed no fixed version listed

## How to check

- Check the OpenBao version with `bao version`; versions below `2.6.5` or `2.7.2` on their respective branches are affected.
- Look for OIDC providers with public clients that have client_credentials grant enabled.

## Fix

- Upgrade OpenBao to `2.6.5` (2.6 branch) or `2.7.2` (2.7 branch).

## Timeline

- 2026-11-13T10:47:15+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-126310

## Documents

- [advisory] Vendor advisory: github.com https://github.com/openbao/openbao/security/advisories/GHSA-q824-44ff-f5j5
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/openbao-before-2.6.5-and-2.7.2-oidc-provider-authentication-bypass-via-client-credentials

## From the sources

OpenBao before 2.6.5 and 2.7.2 contains an authentication bypass vulnerability that allows unauthenticated callers to obtain OIDC ID tokens by abusing public clients with client_credentials enabled. Attackers who know a public client's client_id can request tokens from the identity/oidc/provider/<name>/token endpoint to impersonate the client without any secret.

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_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_