Is this vulnerability remotely exploitable?

Yes, but only by authenticated users. Any user who can log in and access at least one task with attachments can exploit the issue over the Vikunja HTTP API.

Does an attacker need elevated privileges to exploit this?

No. Basic authenticated access is sufficient. The attacker does not need admin or project-owner rights; they only need any task they can legitimately access as a carrier for arbitrary attachment IDs.

What is the safest general fix pattern?

The robust fix is to enforce object-level authorization by constraining attachment queries to both the attachment ID and its parent context (such as the task or project ID), and ensuring that the same context is used for both permission checks and database lookups.

Severity:

HIGH RISK

(8.1)

Insecure Direct Object Reference (CWE-639) in Vikunja Task Attachments

CVE-2026-33678

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:

Insecure Direct Object Reference (IDOR)

CWE:

CWE-639

Impact:

Unauthorized Access and Modification of Attachments Across Projects

Severity:

HIGH RISK

(8.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Insecure Direct Object Reference (IDOR)

CWE:

CWE-639

Impact:

Unauthorized Access and Modification of Attachments Across Projects

Severity:

HIGH RISK

(8.1)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

Detect vulnerable code directly in pull requests, so CVEs are fixed before merge.

Get Started

Ship clean & secure code faster

START 14 DAYS FREE TRIAL

BOOK A DEMO

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Insecure Direct Object Reference (CWE-639) in Vikunja Task Attachments

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

Product

Pricing

Company

Legal

Developers

Compare

Product

Pricing

Company

Legal

Developers

Compare

Product

Pricing

Company

Legal

Developers

Compare