CVE-2026-76216 json
Vikunja through 2.4.0 Principal-Type Confusion via LinkSharing
published 2026-08-19 2 mo ago modified 2026-10-27 12 d ago also GHSA-32r8-5843-4qw2 , GO-2026-6711 , EUVD-2026-62457
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 30%
- public exploits
- 0
- none known
Summary
Vikunja through 2.4.0 contains a principal-type confusion vulnerability where LinkSharing principals with id N are treated as user principals with users.id == N at three permission checks lacking type guards. Attackers with a link-share JWT can remove victims from teams, enumerate and delete victim bot users, or read team rosters by exploiting id collisions in the autoincrement space.
Patch / fix
- go code.vikunja.io/api 2.5.0
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 2 mo ago
Exploit prediction
0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 7.7 | CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 7.7 | CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | code.vikunja.io/api | <2.5.0 all versions |
2.5.0 |
Affected products
- go-vikunja vikunja
Classification
References
-
github.com
/go-vikunja/vikunja/commit/a717d64d5658708ba390f18dd697f5e567e68aac
web
-
github.com
/go-vikunja/vikunja/security/advisories/GHSA-32r8-5843-4qw2
vendor-advisory, web, advisory
-
vulncheck.com
/advisories/vikunja-through-principal-type-confusion-via-linksharing
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-76216
advisory
-
github.com
/go-vikunja/vikunja
package
-
github.com
/go-vikunja/vikunja/releases/tag/v2.5.0
web
Sources
- CVE List CVE-2026-76216
- GitHub Advisory GHSA-32r8-5843-4qw2
- NVD CVE-2026-76216
- OSV GO-2026-6711
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.