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TI-2026-62113 Aliases CVE-2026-91983GHSA-9rg3-v78m-26q8GHSA-phph-c358-5mwm

Vikunja before 2.6.0 API Token Scope Bypass via expand Parameter

Priority MEDIUM 57CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00305 23rd percentileScored 2026-11-07
Fix Fixed vikunja (go-vikunja): 2.6.0code.vikunja.io/api (Go): 2.6.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
go-vikunjavikunja1.0.0 to before 2.6.02.6.0Patch availableCNA
—code.vikunja.io/api (Go)1.0.0 to before 2.6.02.6.0Patch availableGHSA-9rg3-v78m-26q8
  • vikunja Vendorgo-vikunja Affected 1.0.0 to before 2.6.0 Fixed in 2.6.0 Patch available CNA
  • code.vikunja.io/api (Go) Vendor— Affected 1.0.0 to before 2.6.0 Fixed in 2.6.0 Patch available GHSA-9rg3-v78m-26q8

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*——go-vikunja
  • cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:* Versions — — ·go-vikunja

Remediation

  • Fix · CNA vikunja (go-vikunja) Fixed in 2.6.0
  • Fix · GHSA-9rg3-v78m-26q8 code.vikunja.io/api (Go) Fixed in 2.6.0 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    go-vikunja vikunja 2.6.0

    13 records Highest priority Priority HIGH 3 HIGH, 7 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2026-62115 Vikunja before 2.6.0 Privilege Escalation via Link Share HashPriority HIGH 77
    • TI-2026-62108 Vikunja before 2.6.0 Authentication Bypass via CalDAV BasicAuthPriority HIGH 77
    • TI-2026-62107 Vikunja before 2.6.0 Authentication Bypass via Unthrottled APIPriority HIGH 77
    Show all 13 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-91983
  2. 2026-10-03 Alias added: GHSA-phph-c358-5mwm
  3. 2026-10-10 Alias added: GHSA-9rg3-v78m-26q8
  4. 2026-10-10 Fix available: Go/code.vikunja.io/[email protected] · GHSA-9rg3-v78m-26q8
  5. 2026-10-10 CVSS score added · GHSA-9rg3-v78m-26q8
  6. 2026-10-10 Weakness changed · GHSA-9rg3-v78m-26q8
  7. 2026-10-10 6 new references · GHSA-9rg3-v78m-26q8

References

Advisory 2

Other 4

  • TI-2026-40929 Authorization bypass in go-vikunja Vikunja CVSS 4.0CRITICAL 9.3
  • TI-2026-21967 Vijkunja has Weak Password Policy Combined with Persistent Sessions After Password Change CVSS 3.1CRITICAL 9.1
  • TI-2026-62115 Vikunja before 2.6.0 Privilege Escalation via Link Share Hash CVSS 4.0HIGH 8.7
  • TI-2026-62108 Vikunja before 2.6.0 Authentication Bypass via CalDAV BasicAuth CVSS 4.0HIGH 8.7
  • TI-2026-62107 Vikunja before 2.6.0 Authentication Bypass via Unthrottled API CVSS 4.0HIGH 8.7
  • TI-2026-26971 Vikunja ahs a TOTP Two-Factor Authentication Bypass via OIDC Login Path CVSS 3.1CRITICAL 9.1
See all 105 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences