{"items":[{"id":"NVI-00008958","kind":"vulnerability","title":"Vikunja: Link-share principal-type confusion enables cross-account team removal, bot takeover, and roster disclosure","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-32r8-5843-4qw2","CVE-2026-76216"],"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-ba87849d6dedf843d007f378437a36ba"],"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":"2026-10-27T15:18:35.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-49fe0bf4cf95e7d73a4f22ab1d2c320f"},{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.363%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.30126. Missing scores are unknown.","source_id":"sr-ba87849d6dedf843d007f378437a36ba"}],"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-49fe0bf4cf95e7d73a4f22ab1d2c320f","url":"https://github.com/advisories/GHSA-32r8-5843-4qw2","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-32r8-5843-4qw2","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:56:51.534Z"},{"id":"sr-ba87849d6dedf843d007f378437a36ba","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-76216","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.384Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-49fe0bf4cf95e7d73a4f22ab1d2c320f"],"technology":"code.vikunja.io/api","known_exclusions":[],"conditions_summary":"## Summary\nVikunja's `web.Auth` interface (`pkg/web/web.go`, single method `GetID() int64`) is satisfied by BOTH `*user.User` and `*models.LinkSharing`. A link-share's `GetID()` returns the **raw positive** `share.ID` (`pkg/models/link_sharing.go:83-85`), which lives in the same positive autoincrement ID space as `users.id`. The safe negated form `getUserID() = share.ID * -1` (`link_sharing.go:126-128`) exists but is NOT used at three permission sinks. As a result, a link-share principal with id `N` — which should have zero authority over teams or bot users — is treated as the *user* whose `users.id == N` at three permission checks that lack the `a.(*LinkSharing)` guard their sibling methods have. This is the same principal-type-confusion class as CVE-2026-68581 (GHSA-vvcv-vpph-h844), but at three code paths that advisory/fix never touched.\n\n## Root Cause\n`web.Auth` is a one-method interface (`GetID() int64`). `*LinkSharing.GetID()` returns the raw positive share id. Three permission methods compare this raw id directly and omit the link-share type guard used elsewhere in the same files:\n\n1. **`TeamMember.CanDelete`** (`pkg/models/team_members_permissions.go:31-40`): the self-remov","public_affected_ranges":["< 2.5.0"]}],"null_published_at":"2026-11-05T03:52:54.833Z","source_updated_at":"2026-10-27T15:18:35.000Z","source_disclosed_at":"2026-10-09T20:43:40.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T21:56:51.534Z"},{"id":"NVI-00008958","kind":"vulnerability","title":"Vikunja: Link-share principal-type confusion enables cross-account team removal, bot takeover, and roster disclosure","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-32r8-5843-4qw2","CVE-2026-76216"],"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-49fe0bf4cf95e7d73a4f22ab1d2c320f"],"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":"2026-10-27T15:18:35.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-49fe0bf4cf95e7d73a4f22ab1d2c320f"}],"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-49fe0bf4cf95e7d73a4f22ab1d2c320f","url":"https://github.com/advisories/GHSA-32r8-5843-4qw2","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-32r8-5843-4qw2","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:56:51.534Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-49fe0bf4cf95e7d73a4f22ab1d2c320f"],"technology":"code.vikunja.io/api","known_exclusions":[],"conditions_summary":"## Summary\nVikunja's `web.Auth` interface (`pkg/web/web.go`, single method `GetID() int64`) is satisfied by BOTH `*user.User` and `*models.LinkSharing`. A link-share's `GetID()` returns the **raw positive** `share.ID` (`pkg/models/link_sharing.go:83-85`), which lives in the same positive autoincrement ID space as `users.id`. The safe negated form `getUserID() = share.ID * -1` (`link_sharing.go:126-128`) exists but is NOT used at three permission sinks. As a result, a link-share principal with id `N` — which should have zero authority over teams or bot users — is treated as the *user* whose `users.id == N` at three permission checks that lack the `a.(*LinkSharing)` guard their sibling methods have. This is the same principal-type-confusion class as CVE-2026-68581 (GHSA-vvcv-vpph-h844), but at three code paths that advisory/fix never touched.\n\n## Root Cause\n`web.Auth` is a one-method interface (`GetID() int64`). `*LinkSharing.GetID()` returns the raw positive share id. Three permission methods compare this raw id directly and omit the link-share type guard used elsewhere in the same files:\n\n1. **`TeamMember.CanDelete`** (`pkg/models/team_members_permissions.go:31-40`): the self-remov","public_affected_ranges":["< 2.5.0"]}],"null_published_at":"2026-10-31T22:13:27.124Z","source_updated_at":"2026-10-27T15:18:35.000Z","source_disclosed_at":"2026-10-09T20:43:40.000Z","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":"2026-10-31T21:56:51.534Z"}],"next_cursor":null,"snapshot_revision":"42594"}