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TI-2026-53555 Aliases CVE-2026-76647GHSA-62fx-wqcf-qg97

Leantime JSON-RPC API contains a missing authorization vulnerability

Priority HIGH 73CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure, Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-200 and CWE-639.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00506 43rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LeantimeJSON-RPC APIup to 3.8.0—No fix listedCNA
  • JSON-RPC API VendorLeantime Affected up to 3.8.0 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-76647
  2. 2026-10-03 Alias added: GHSA-62fx-wqcf-qg97

References

Other 3

  • TI-2026-71921 Missing authorization in Leantime lets users create admin accounts CVSS 3.1HIGH 8.8
  • TI-2024-18279 Leantime 3.0.6 is vulnerable to Cross Site Request Forgery (CSRF). CVSS 3.1HIGH 8.8
  • TI-2024-18354 Cross Site Scripting vulnerability in Leantime v3.0.6 allows attackers to execute… CVSS 3.1HIGH 7.6
  • TI-2026-62514 Leantime before 3.9.6 Unauthorized Plugin Installation via HTMX CVSS 4.0HIGH 7.1
  • TI-2026-47171 Leantime all versions prior to and 3.6.2 Broken Access Control via tickets.getMilestone JSON-RPC CVSS 4.0HIGH 7.1
  • TI-2024-18353 Cross Site Scripting vulnerability in Leantime 3.0.6 allows a remote attacker to execute… CVSS 3.1MEDIUM 5.4
See all 18 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences