Medium severity4.3NVD Advisory· Published Sep 15, 2026· Updated Sep 16, 2026
CVE-2026-91983
CVE-2026-91983
Description
Vikunja before 2.6.0 contains an API token scope bypass vulnerability in task read endpoints where authorization fails to inspect query string parameters. Attackers with limited token scopes can use the expand parameter to access restricted data like comments, reactions, and time entries without proper permission verification.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
code.vikunja.io/apiGo | >= 1.0.0, < 2.6.0 | 2.6.0 |
Affected products
2- Range: <2.6.0
Patches
Vulnerability mechanics
References
7- github.com/advisories/GHSA-9rg3-v78m-26q8ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-91983ghsaADVISORY
- github.com/go-vikunja/vikunja/commit/077dc4de79ce6f1ab59215a2c7bf9b30423685f2ghsaWEB
- github.com/go-vikunja/vikunja/pull/3688ghsaWEB
- github.com/go-vikunja/vikunja/releases/tag/v2.6.0ghsaWEB
- github.com/go-vikunja/vikunja/security/advisories/GHSA-9rg3-v78m-26q8nvdWEB
- www.vulncheck.com/advisories/vikunja-before-2.6.0-api-token-scope-bypass-via-expand-parameternvdWEB
News mentions
1- Go Vikunja: Twelve Vulnerabilities Including Privilege Escalation and Auth Bypass Disclosed TogetherVypr Intelligence · Sep 15, 2026