What’s Vulnerable › Vulnerabilities

CVE-2026-76647: Leantime JSON-RPC API contains a missing authorization vulnerability

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-19 · updated 2026-09-08
• Weakness: CWE-200

Description

Leantime JSON-RPC API through version 3.9.0 contains a missing authorization vulnerability in the JSON-RPC dispatcher in app/Domain/Api/Controllers/Jsonrpc.php. The dispatcher does not enforce authorization before invoking service-layer methods, allowing an authenticated user to call methods or act on resources outside their intended permissions. For example, the editOwn method accepts a user-supplied user ID without verifying that it belongs to the caller, allowing an attacker to modify another user's account and set a new password, resulting in account takeover. This vulnerability is distinct from CVE-2026-59712 and CVE-2026-15509 because the root cause is the lack of centralized authorization enforcement in the JSON-RPC dispatcher rather than the behavior of an individual exposed method.

Affected products

• Leantime JSON-RPC API: through 3.8.0

References

• https://leantime.io/unlocking-leantimes-power-a-guide-to-the-json-rpc-api/
• https://vokecyber.com/blog/leantime-jsonrpc-editown-account-takeover
• https://vokecyber.com/research/leantime-jsonrpc-editown-account-takeover
• https://vokecyber.com/research/leantime-jsonrpc-editown-account-takeover

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