CVE-2026-33758 | OpenBao up to 2.5.1 OIDC/JWT callback_mode error_description cross site scripting

VDB-353934 · CVE-2026-33758 · GCVE-0-2026-33758 OPENBAO UP TO 2.5.1 OIDC/JWT CALLBACK_MODE ERROR_DESCRIPTION CROSS SITE SCRIPTING HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.1 $0-$5k 1.45+ Summaryinfo A vulnerability classified as problematic was found in OpenBao up to 2.5.1. This impacts the function callback_mode of the component OIDC/JWT. The manipulation of the argument error_description results in cross site scripting. This vulnerability is cataloged as CVE-2026-33758. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised. Detailsinfo A vulnerability classified as problematic has been found in OpenBao up to 2.5.1. Affected is the function callback_mode of the component OIDC/JWT. The manipulation of the argument error_description with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes: 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`. The advisory is available at github.com. This vulnerability is traded as CVE-2026-33758 since 03/23/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project. Upgrading to version 2.5.2 eliminates this vulnerability. Productinfo Name OpenBao Version 2.5.0 2.5.1 Website Product: https://github.com/openbao/openbao/ CPE 2.3info 🔒 🔒 CPE 2.2info 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 4.3 VulDB Meta Temp Score: 4.1 VulDB Base Score: 4.3 VulDB Temp Score: 4.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Cross site scripting CWE: CWE-79 / CWE-94 / CWE-74 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: OpenBao 2.5.2 Timelineinfo 03/23/2026 CVE reserved 03/27/2026 +4 days Advisory disclosed 03/27/2026 +0 days VulDB entry created 03/27/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-33758 (🔒) GCVE (CVE): GCVE-0-2026-33758 GCVE (VulDB): GCVE-100-353934 Entryinfo Created: 03/27/2026 15:51 Changes: 03/27/2026 15:51 (68) Complete: 🔍 Cache ID: 99:C6D:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸