CVE-2026-123526
Vikunja before 2.7.1 Mass Assignment via Team external_id Field
Vikunja before 2.7.1 contains a mass assignment vulnerability that allows any authenticated user to set the read-only external_id field through the team create and update endpoints. Attackers can tag a team they create or administer as externally managed, permanently blocking removal of every member and causing SSO members to be dropped from the team at their next login.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| vikunja go-vikunja code.vikunja.io/api
golang |
≥ 0; < 2.7.1 (affected, semver) 2.7.1 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 5.3 medium |
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N | CNA: VulnCheck |
| 3.1 / 5.4 medium |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L | CNA: VulnCheck |
| 4.0 / 5.3 medium |
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/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 | NVD: [email protected] |
| 3.1 / 5.4 medium |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L | NVD: [email protected] |
Exploit evidence
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-fjrf-gjmg-9v6g
exploit · ADP: CISA-ADP
References
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-fjrf-gjmg-9v6gCNA: VulnCheck · vendor-advisory
- https://www.vulncheck.com/advisories/vikunja-before-2.7.1-mass-assignment-via-team-external-id-fieldCNA: VulnCheck · third-party-advisory
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-fjrf-gjmg-9v6gADP: CISA-ADP · exploit
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-fjrf-gjmg-9v6g[email protected]
- https://www.vulncheck.com/advisories/vikunja-before-2.7.1-mass-assignment-via-team-external-id-field[email protected]
For agents and automation
Read public disclosures for free as Markdown or JSON. Compatible browsers also expose native WebMCP tools to search disclosures, read this page, and discover API access.
Use the ontology-linked Cyber API with x402 pay per request, or a Y2 Pro or Elite API key with the intel:cyber scope.
Endpoints and access details
https://api.y2.dev/api/v2/cyber/cveshttps://api.y2.dev/api/v2/cyber/cves/{cveId}
A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.
For x402, omit Authorization and read the HTTP 402 payment challenge before signing a retry. Public browser tools do not make payments.