https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-06T07:59:13.109447+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/euvd-2026-291191 EUVD-2026-291191 2026-10-06T07:59:13.158646+00:00 EUVD-2026-291191 https://cve.radiocsirt.org/vuln/fkie_cve-2026-35594 fkie_cve-2026-35594 2026-10-06T07:59:13.158685+00:00

Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, Vikunja's link share authentication (GetLinkShareFromClaims in pkg/models/link_sharing.go) constructs authorization objects entirely from JWT claims without any server-side database validation. When a project owner deletes a link share or downgrades its permissions, all previously issued JWTs continue to grant the original permission level for up to 72 hours (the default service.jwtttl). This vulnerability is fixed in 2.3.0.

 https://cve.radiocsirt.org/vuln/ghsa-96q5-xm3p-7m84 GHSA-96q5-xm3p-7m84 — Vikunja: Link Share JWT tokens remain valid for 72 hours after share deletion or permission downgrade 2026-10-06T07:59:13.158722+00:00

Affected: Go: code.vikunja.io/api

## Title Link Share JWT tokens remain valid for 72 hours after share deletion or permission downgrade

## Description

Vikunja's link share authentication constructs authorization objects entirely from JWT claims without any server-side database validation. When a project owner deletes a link share or downgrades its permissions, all previously issued JWTs continue to grant the **original** permission level for up to **72 hours** (the default `service.jwtttl`).

`GetLinkShareFromClaims` at `pkg/models/link_sharing.go` lines 88-119 performs **zero database queries** — it builds the `LinkSharing` struct purely from JWT claim values (`id`, `hash`, `project_id`, `permission`, `sharedByID`). This struct is passed directly to permission checks:

| Function | File | Lines | DB queries | |----------|------|-------|------------| | `GetLinkShareFromClaims` | `link_sharing.go` | 88-119 | 0 | | `Project.CanRead` (link share) | `project_permissions.go` | 105-108 | 0 | | `Project.CanWrite` (link share) | `project_permissions.go` | 50-53 | 0 | | `Project.IsAdmin` (link share) | `project_permissions.go` | 192-194 | 0 |

**Contrast with user tokens:** User JWTs use a 10-minute TTL (`ServiceJWTTTLShort`) with `sid` claim and server-side sessions enabling revocation. Link share JWTs use a 72-hour TTL (`ServiceJWTTTL`) with no `sid`, no server-side session, and no refresh mechanism.

**Permalink:** - `GetLinkShareFromClaims`: `pkg/models/link_sharing.go:88-119` - `NewLinkShareJWTAuthtoken`: `pkg…