{"items":[{"id":"NVI-00009093","kind":"vulnerability","title":"Vikunja: Explicit lower-permission share on a sub-project is silently overridden by an inherited parent permission (broken access control / privilege-management regression in v2.6.0)","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-pjr3-86v4-5p7w"],"plain_summary":"GitHub lists this reviewed advisory for code.vikunja.io/api. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-aed3e288287d707e114fd92d98525dce"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-28T15:14:59.000Z","value":"5.4 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-aed3e288287d707e114fd92d98525dce"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-aed3e288287d707e114fd92d98525dce","url":"https://github.com/advisories/GHSA-pjr3-86v4-5p7w","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-pjr3-86v4-5p7w","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:56:36.327Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-aed3e288287d707e114fd92d98525dce"],"technology":"code.vikunja.io/api","known_exclusions":[],"conditions_summary":"## Description\n\n### Summary\n\nIn Vikunja v2.6.0 the project-permission engine resolves a user's effective permission on a project as\nthe **MAX over the entire reachable project subtree**. As a result, when a user has been granted a\n**higher** permission on a parent project and the owner *explicitly* shares a **child** project with\nthat same user at a **lower** permission (an intended down-restriction), the explicit lower grant is\n**silently ignored** and the user receives the higher, inherited permission on the child. A user\nwho was deliberately restricted to **read-only** on a sensitive sub-project can therefore modify it,\ndelete it, and re-share it (including granting other users admin) - none of which the owner intended.\nThis is a behavior regression from v2.5.0, whose engine used \"nearest-ancestor-grant-wins\" semantics\nthat honored the explicit child grant.\n\n### Details\n\nEffective permissions are computed by a single recursive CTE in\n`pkg/models/project_access.go` (`getProjectAccessForUser`):\n\n```sql\nWITH RECURSIVE grants (project_id, permission) AS (\n    SELECT project_id, MAX(permission) FROM (\n        SELECT id AS project_id, 2 AS permission FROM projects WHERE owner_id = ?\n ","public_affected_ranges":["= 2.6.0"]}],"null_published_at":"2026-10-31T22:13:31.276Z","source_updated_at":"2026-10-28T15:14:59.000Z","source_disclosed_at":"2026-10-09T20:57:44.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T21:56:36.327Z"}],"next_cursor":null,"snapshot_revision":"42594"}