{"id":"GHSA-8wvg-r2j4-3737","title":"Vikunja: Assignee email addresses disclosed to read-only project members via the task assignees endpoint","summary":"Vikunja: Assignee email addresses disclosed to read-only project members via the task assignees endpoint","severity":"medium","cwe":["CWE-200"],"vendor":"api","product":"code.vikunja.io/api","ecosystem":"go","affected":["code.vikunja.io/api <= 2.5.0"],"patched":["code.vikunja.io/api 2.6.0"],"published":"2026-10-09","updated":"2026-10-09","sourceUpdated":"2026-10-09T20:54:51Z","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-8wvg-r2j4-3737","references":[{"url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-8wvg-r2j4-3737"},{"url":"https://github.com/go-vikunja/vikunja/pull/3688"},{"url":"https://github.com/go-vikunja/vikunja/releases/tag/v2.6.0"},{"url":"https://github.com/advisories/GHSA-8wvg-r2j4-3737"}],"tags":["ghsa","go"],"ingestedAt":"2026-10-09T21:12:42.324Z","slug":"GHSA-8wvg-r2j4-3737","body":"## Overview\n\n### Summary\n`TaskAssginee.ReadAll` returns assignee user objects without blanking the `Email` field, disclosing assignee email addresses to any read-only project member. Every sibling path that returns user objects obfuscates the email; this one does not.\n\n### Details\n`pkg/models/task_assignees.go` (~lines 306-344) does `Select(\"users.*\")` and returns the result directly. `User.Email` is `json:\"email,omitempty\"`, so a non-empty value always serializes. The endpoint gates on `task.CanRead`, so a read-only member passes. Sibling paths blank the field: `pkg/models/tasks.go:530`, `pkg/models/project_users.go:216`, `pkg/models/teams.go:177`, `pkg/models/label_task.go:312`, `pkg/models/task_attachment.go:511`. The omission here reads as an oversight, not a decision.\n\nThe same file's `getRawTaskAssigneesForTasks` (~line 56) also selects `users.*` but is safe because its only caller (`addAssigneesToTasks`) blanks the email afterwards.\n\n### PoC (verified at runtime against v2.5.0, v1 and v2)\n```\nGET /api/v1/tasks/{id}/assignees   (reader with permission:0)\n-> [{\"id\":37,\"username\":\"...\",\"email\":\"assignee+SECRET@example.test\", ...}]\n```\nSame leak on `GET /api/v2/tasks/{id}/assignees` (routes through the identical model method). Contrast: `GET /api/v1/projects/{id}/projectusers` and the project task-embed both return the same users with no email.\n\n### Impact\nDisclosure of assignees' email addresses to users who should only see usernames. Read-only.\n\n### Fix\nBlank `Email` on each returned user in `TaskAssginee.ReadAll` before returning, matching the sibling paths. Covers v1 and v2 at once.\n\n## Affected packages\n\n- `code.vikunja.io/api <= 2.5.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `code.vikunja.io/api 2.6.0`","depth":"sunlit","depthScore":28,"depthScoreParts":{"impact":27.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}