{"schema_version":"1.9.0","id":"BIT-openbao-2026-33758","published":"2026-07-27T05:49:05.059Z","modified":"2026-09-08T08:48:16.647741052Z","aliases":["CVE-2026-33758","GHSA-cpj3-3r2f-xj59","GO-2026-4862"],"summary":"OpenBao has Reflected XSS in its OIDC authentication error message","details":"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`.","affected":[{"package":{"name":"openbao","ecosystem":"Bitnami","purl":"pkg:bitnami/openbao"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.5.2"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/openbao/BIT-openbao-2026-33758.json"},"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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"}]}],"references":[{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-33758"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2452294"},{"type":"FIX","url":"https://github.com/openbao/openbao/commit/6e2b2dd84f0e47cebc90d6e79609dd5274732662"},{"type":"FIX","url":"https://github.com/openbao/openbao/pull/2709"},{"type":"ARTICLE","url":"https://github.com/openbao/openbao/releases/tag/v2.5.2"},{"type":"ADVISORY","url":"https://github.com/openbao/openbao/security/advisories/GHSA-cpj3-3r2f-xj59"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33758"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33758.json"}],"database_specific":{"cpes":["cpe:2.3:a:openbao:openbao:*:*:*:*:*:*:*:*"],"severity":"Critical"}}