CVE-2026-5514 in Bob
Summary
by MITRE • 11/14/2026
IBM Bob 2.0.3 allows unauthorized extensions to retrieve session tokens via the authentication provider API. The token is exposed in the account identifier field during account enumeration, without requiring explicit user consent. This may allow malicious extensions to access sensitive session information and potentially perform unauthorized actions on behalf of the user.
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Analysis
by VulDB Data Team • 11/14/2026
The vulnerability identified in IBM Bob version 2.0.3 represents a critical flaw within the browser extension ecosystem's authentication mechanism, specifically concerning how session tokens are handled during account enumeration processes. This issue stems from an improper implementation of access controls within the authentication provider API, which fails to enforce strict boundaries between authorized and unauthorized extensions. In a secure architecture, sensitive credentials such as session tokens should be isolated and accessible only to explicitly trusted components that have undergone rigorous verification and user consent procedures. However, in this instance, the design allows any extension, regardless of its trust level or origin, to query the authentication provider API and retrieve active session tokens. This architectural weakness fundamentally undermines the principle of least privilege, granting broad access to high-value credentials without the necessary safeguards typically found in modern identity management systems.
The technical manifestation of this flaw is particularly severe because it occurs during account enumeration, a process where user identities are validated or listed. During this operation, the session token is inadvertently exposed within the account identifier field. This exposure happens without requiring explicit user consent, which violates standard security protocols for handling sensitive authentication data. Typically, accessing such information would require a deliberate action by the user to grant permission to specific applications. The absence of this consent mechanism means that malicious actors can exploit this gap programmatically and silently. By leveraging common enumeration techniques, an attacker can iterate through potential account identifiers or intercept API responses to capture these tokens. This capability effectively bypasses traditional multi-factor authentication protections if those factors are tied to the session state rather than initial login credentials alone.
The operational impact of this vulnerability is significant, as it enables unauthorized extensions to access sensitive session information with ease. Once a malicious extension obtains a valid session token, it can impersonate the legitimate user across all services that rely on that specific authentication context. This allows for unauthorized actions such as accessing private data, modifying account settings, initiating financial transactions, or exfiltrating personal information. Since the attack does not require physical access to the device or complex social engineering tactics beyond installing a malicious extension, the barrier to entry is low. Furthermore, because the token retrieval happens without user awareness, victims may remain unaware of the compromise until significant damage has occurred. This scenario highlights the risks associated with third-party code execution within browser environments and the potential for widespread credential theft if multiple users install compromised or poorly vetted extensions.
From a classification perspective, this vulnerability aligns closely with CWE-284 Improper Access Control, as it involves unauthorized entities gaining access to restricted resources due to flawed permission checks. It also relates to CWE-798 Use of Hard-coded Credentials in the context of session management if tokens are treated similarly to static secrets during transit or storage within the extension's memory space. In terms of offensive security frameworks like MITRE ATT&CK, this behavior maps to T1056 Input Capture and specifically T1528 Steal Application Access Token, where attackers aim to hijack existing sessions rather than cracking passwords. The lack of user consent further exacerbates the risk by removing a critical layer of defense that relies on human verification to prevent unauthorized data access.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. For IBM Bob 2.0.3, users should immediately update to a patched version where the authentication provider API has been hardened to restrict token retrieval exclusively to whitelisted extensions with verified signatures. Developers implementing similar systems in other applications must enforce strict origin checks and require explicit user consent before exposing any session-related data through APIs. Implementing short-lived tokens with refresh mechanisms can also limit the window of opportunity for attackers, although this does not fully resolve the root cause of unauthorized access. Additionally, browser vendors should consider enhancing extension permission models to provide more granular control over API endpoints that handle sensitive authentication data. Security audits and penetration testing focused on identity flow within extensions are essential to identify similar flaws before they can be exploited in production environments.