CVE-2026-91985

HIGH 7.5

Vikunja before 2.6.0 Privilege Escalation via Link Share Hash

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

Vikunja before 2.6.0 fails to properly restrict access to the link-share hash field in single-share read endpoints, allowing read-only members to obtain the share's secret credential. Attackers can exchange the disclosed hash for a link-share JWT at the share's permission level to escalate privileges and perform unauthorized writes or administrative actions.

CWE	CWE-200
Vendor	go-vikunja
Product	vikunja
Published	Sep 15, 2026
Last Updated	Sep 15, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

go-vikunja / vikunja

0 < 2.6.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/go-vikunja/vikunja/security/advisories/GHSA-qfwc-vx6f-3g6g vulncheck.com: https://www.vulncheck.com/advisories/vikunja-before-2.6.0-privilege-escalation-via-link-share-hash

Credits

🔍 ybsun0215 🔍 JellowBeanz26 🔍 0xcelien