---
title: "CVE-2026-91985: Vikunja - Broken Access Control"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-91985/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-91985)

## 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](https://cwe.mitre.org/data/definitions/200.html)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-91985](https://nvd.nist.gov/vuln/detail/CVE-2026-91985)
- [https://github.com/go-vikunja/vikunja/security/advisories/GHSA-qfwc-vx6f-3g6g](https://github.com/go-vikunja/vikunja/security/advisories/GHSA-qfwc-vx6f-3g6g)
- [https://www.vulncheck.com/advisories/vikunja-before-2.6.0-privilege-escalation-via-link-share-hash](https://www.vulncheck.com/advisories/vikunja-before-2.6.0-privilege-escalation-via-link-share-hash)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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