CVE-2026-111169 in docs
Summary
by MITRE • 10/15/2026
La Suite Docs through 6.0.0 contains an authorization bypass vulnerability that allows authenticated users to write comments into threads of documents they cannot access. Attackers who know a thread UUID can route a POST comment request through their own document's resource_id, inserting comments into another document's thread without access.
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Analysis
by VulDB Data Team • 10/15/2026
The identified vulnerability in La Suite Docs version 6.0.0 and earlier represents a critical failure in server-side authorization controls, specifically classified under CWE-284 Improper Access Control. This flaw allows authenticated users to perform unauthorized write operations on resources they do not own or have permission to access. The core technical issue lies in the application's handling of document thread identifiers versus resource ownership verification. When an authenticated user initiates a POST request to add a comment, the backend logic relies primarily on the presence of valid authentication credentials and potentially the structural validity of the provided UUIDs, rather than performing a rigorous check to ensure that the requesting user has explicit permission to modify the specific document associated with the target thread.
The exploitation mechanism is straightforward yet effective for an attacker who possesses knowledge of a target thread's universally unique identifier (UUID). By crafting a malicious HTTP POST request, the attacker can supply their own valid resource_id from a document they do have access to, while simultaneously providing the UUID of the target thread belonging to a restricted or private document. The server processes this request by associating the new comment with the provided thread UUID but fails to validate that the user submitting the data is authorized to interact with that specific thread's parent document. This logic error effectively decouples the authentication state from the authorization check, allowing the injection of content into threads where the attacker has no legitimate standing.
The operational impact of this vulnerability extends beyond simple unauthorized access; it compromises the integrity and confidentiality of collaborative documents. An attacker can inject misleading comments, spam, or malicious links into discussions within sensitive projects, potentially disrupting workflow and damaging professional relationships among team members. Furthermore, if the application renders these comments in a context susceptible to cross-site scripting (XSS), the impact could escalate to account takeover or data exfiltration for other users viewing those threads. This vulnerability undermines the fundamental trust model of collaborative software, where access controls are expected to be strictly enforced at every level of interaction with shared resources.
From an industry standard perspective, this flaw aligns closely with MITRE ATT&CK technique T1078 Valid Accounts, as it leverages legitimate credentials to perform actions outside their intended scope. It also reflects weaknesses in input validation and access control logic often seen in CWE-639 Authorization Bypass Through User-Controlled Key. The vulnerability highlights the necessity of implementing robust server-side checks that verify user permissions against both the resource being accessed and any associated metadata before processing state-changing requests.
To mitigate this risk, developers must enforce strict authorization checks at the point of data modification. Every POST request intended to create a comment or modify thread content should trigger a backend verification process that confirms the authenticated user has read-write access rights for the specific document linked to the target thread UUID. This involves querying the database or permission service with both the user's identity and the resource ID associated with the thread, ensuring they match before allowing the write operation. Additionally, implementing principle of least privilege in API design and conducting regular security audits focused on authorization logic can prevent similar bypasses in future updates.