CVE-2026-40264 | OpenBao up to 2.5.2 improper restriction of security token assignment (GHSA-p49j-v9wc-wg57)

VDB-358393 · CVE-2026-40264 · GHSA-P49J-V9WC-WG57 OPENBAO UP TO 2.5.2 IMPROPER RESTRICTION OF SECURITY TOKEN ASSIGNMENT HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 2.6 $0-$5k 2.25+ Summaryinfo A vulnerability was found in OpenBao up to 2.5.2. It has been rated as problematic. This affects an unknown part. This manipulation causes improper restriction of security token assignment. This vulnerability appears as CVE-2026-40264. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised. Detailsinfo A vulnerability has been found in OpenBao up to 2.5.2 and classified as problematic. Affected by this vulnerability is an unknown function. The manipulation with an unknown input leads to a improper restriction of security token assignment vulnerability. The CWE definition for the vulnerability is CWE-1259. The System-On-A-Chip (SoC) implements a Security Token mechanism to differentiate what actions are allowed or disallowed when a transaction originates from an entity. However, the Security Tokens are improperly protected. As an impact it is known to affect availability. The summary by CVE is: OpenBao is an open source identity-based secrets management system. OpenBao's namespaces provide multi-tenant separation. Prior to version 2.5.3, a tenant who leaks token accessors can have their token revoked or renewed by a privileged administrator in another tenant. This is addressed in v2.5.3. The advisory is shared at github.com. This vulnerability is known as CVE-2026-40264 since 04/10/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are necessary for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1134.001 for this issue. Upgrading to version 2.5.3 eliminates this vulnerability. Productinfo Name OpenBao Version 2.5.0 2.5.1 2.5.2 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: 2.7 VulDB Meta Temp Score: 2.6 VulDB Base Score: 2.7 VulDB Temp Score: 2.6 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: Improper restriction of security token assignment CWE: CWE-1259 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 2.5.3 Timelineinfo 04/10/2026 CVE reserved 04/21/2026 +11 days Advisory disclosed 04/21/2026 +0 days VulDB entry created 04/21/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-p49j-v9wc-wg57 Status: Confirmed CVE: CVE-2026-40264 (🔒) GCVE (CVE): GCVE-0-2026-40264 GCVE (VulDB): GCVE-100-358393 Entryinfo Created: 04/21/2026 07:07 Changes: 04/21/2026 07:07 (66) Complete: 🔍 Cache ID: 99:A10:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸