Leantime JSON-RPC API contains a missing authorization vulnerability

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-76647
StatePUBLISHED
Assignercertcc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-19 20:17:24 UTC
Updated2026-09-08 14:07:24 UTC
DescriptionLeantime 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from ADP

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001650000 probability, percentile 0.059440000 (date 2026-08-27)

Problem Types: CWE-200 | CWE-639 | CWE-862 | CWE-862 Missing Authorization | CWE-200 Exposure of Sensitive Information to an Unauthorized Actor | CWE-639 Authorization Bypass Through User-Controlled Key | CWE-862 CWE-862 Missing Authorization | CWE-200 CWE-200 Exposure of Sensitive Information to an Unauthorized Actor | CWE-639 CWE-639 Authorization Bypass Through User-Controlled Key

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Leantime JSON-RPC API affected 3.8.0 custom Not specified

References

ReferenceSourceLinkTags
vokecyber.com/blog/leantime-jsonrpc-editown-account-takeover [email protected] vokecyber.com
leantime.io/unlocking-leantimes-power-a-guide-to-the-json-rpc-api [email protected] leantime.io
vokecyber.com/research/leantime-jsonrpc-editown-account-takeover 134c704f-9b21-4f2e-91b3-4a467353bcc0 vokecyber.com
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