{"cve":"CVE-2026-33758","nvd":{"published":"2026-03-27T15:16:57.863","modified":"2026-07-15T02:20:15.350","status":"Modified","description":"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`.","cvss_v4":{"vector":"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","score":9.4},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-20","CWE-79","CWE-116"],"references":["https://github.com/openbao/openbao/commit/6e2b2dd84f0e47cebc90d6e79609dd5274732662","https://github.com/openbao/openbao/pull/2709","https://github.com/openbao/openbao/releases/tag/v2.5.2","https://github.com/openbao/openbao/security/advisories/GHSA-cpj3-3r2f-xj59","https://access.redhat.com/security/cve/CVE-2026-33758"],"products":["openbao:openbao"],"source":"nvd","synced_at":"2026-10-19T22:28:18.033120106+00:00"},"epss":{"cve":"CVE-2026-33758","score":0.00298,"percentile":0.22537,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-cpj3-3r2f-xj59","url":"https://osv.dev/vulnerability/GHSA-cpj3-3r2f-xj59","summary":"OpenBao has Reflected XSS in its OIDC authentication error message","modified":"2026-07-27T09:11:13.871447665Z","packages":[{"ecosystem":"Go","name":"github.com/openbao/openbao","purl":"pkg:golang/github.com/openbao/openbao","ranges":["<0.0.0-20260325133417-6e2b2dd84f0e"],"fixed":["0.0.0-20260325133417-6e2b2dd84f0e"]}]},{"id":"GO-2026-4862","url":"https://osv.dev/vulnerability/GO-2026-4862","summary":"OpenBao has Reflected XSS in its OIDC authentication error message in github.com/openbao/openbao","modified":"2026-07-27T09:11:13.871447665Z","packages":[{"ecosystem":"Go","name":"github.com/openbao/openbao","purl":"pkg:golang/github.com/openbao/openbao","ranges":["<0.0.0-20260325133417-6e2b2dd84f0e"],"fixed":["0.0.0-20260325133417-6e2b2dd84f0e"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}