CVE-2026-91985 Vikunja - Broken Access Control

Vikunja < 2.6.0 contains a broken access control caused by improper restriction of link-share hash field in single-share read endpoints, letting read-only members escalate privileges to perform unauthorized writes or admin actions, exploit requires read-only membership.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.43% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Privilege Escalation, Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
15 September 2026
Updated
15 October 2026
Weakness
CWE-200

Vendor fix

Update to version 2.6.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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