CVE-2026-58431 in Gitea
Summary
by MITRE • 08/13/2026
Public-only API token restriction is not enforced on team API routes
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Analysis
by VulDB Data Team • 08/13/2026
This vulnerability represents a critical access control flaw that undermines the security posture of API endpoints designed to manage team-based resources. The issue occurs when an application implements API tokens for authentication but fails to properly validate token permissions against the specific route context, allowing public tokens to access team-specific API endpoints that should be restricted to authenticated team members only. This misconfiguration creates a pathway for unauthorized users to potentially escalate their privileges or access sensitive team data through improperly enforced authorization boundaries.
The technical implementation flaw stems from insufficient validation logic within the API gateway or authentication middleware where token types are not properly differentiated based on endpoint requirements. When a public API token is presented against team routes, the system should verify that the token possesses appropriate team-level permissions before granting access. However, in this scenario, the authorization check either completely bypasses team-specific validation or applies inconsistent permission models that fail to distinguish between public and team-access tokens.
The operational impact of this vulnerability extends beyond simple data exposure, as it can enable privilege escalation attacks where unauthorized parties gain access to team management functions such as user invitations, role assignments, or resource allocation controls. Attackers could potentially enumerate team resources, manipulate team configurations, or even impersonate legitimate team members within the system. This vulnerability directly violates the principle of least privilege and can lead to significant data breaches when combined with other exploitation vectors.
From a cybersecurity framework perspective, this issue maps to CWE-285: Improper Authorization and aligns with ATT&CK technique T1078.004: Valid Accounts - Cloud Accounts, as it allows unauthorized access through legitimate authentication mechanisms. The vulnerability also demonstrates characteristics of improper access control as outlined in NIST SP 800-53 controls AC-3 and AC-6, which specifically address authorization and access enforcement requirements for information systems.
Effective mitigations require implementing robust token type validation at the API gateway level where public tokens are explicitly rejected from team-specific routes through explicit permission checks. Organizations should establish clear token classification policies that distinguish between public, user-level, and team-level permissions, ensuring that each endpoint validates appropriate authorization levels before processing requests. Additionally, comprehensive logging and monitoring of access attempts against team routes can help detect anomalous behavior indicative of this vulnerability being exploited.
The remediation approach should include implementing proper middleware or API gateway rules that enforce token type validation based on route requirements, establishing clear separation between public and team-access endpoints, and conducting regular security testing to verify that authorization boundaries remain intact. Organizations must also review their token lifecycle management processes to ensure that different token types are properly categorized and that access control policies are consistently enforced across all API endpoints regardless of the authentication method used.