How broadly exploitable is this vulnerability?

The vulnerability is exploitable by anyone who can obtain a valid link share for a project, even if that share grants only read-only access. From there, they can enumerate and hijack other shares on the same project.

Does exploitation require authenticated user accounts?

No traditional user account is required. Possession of a project link share (for example, a URL shared with a guest) is sufficient to authenticate as a link share user and trigger the vulnerable listing behavior.

What is the safest general fix pattern for this type of issue?

The most robust fix is to centralize access control in a shared authorization layer and require all handlers (including bulk list endpoints) to invoke the same checks. Additionally, list endpoints should avoid including sensitive secret or token fields in responses.

Severity:

HIGH RISK

(7.5)

Authorization Bypass via Incomplete Access Control (CWE-285) in Vikunja Link Sharing

CVE-2026-33680

Published:

Mar 24, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Authorization Bypass / Improper Access Control

CWE:

CWE-285

Impact:

Privilege Escalation to Project Admin via Link Share Hijacking

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Authorization Bypass / Improper Access Control

CWE:

CWE-285

Impact:

Privilege Escalation to Project Admin via Link Share Hijacking

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

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Ask AI for summary of CodeAnt

Authorization Bypass via Incomplete Access Control (CWE-285) in Vikunja Link Sharing

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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