CVE-2026-33678Public exploitNetwork attack vector

Cross-project file theft and deletion via ID-only lookup

Published Mar 24, 2026 · Updated Mar 24, 2026

Authorization bypass in Vikunja before 2.2.1 allows remote authenticated users to download or delete attachments across projects. TaskAttachment.ReadOne() queries only the attachment ID, while CanRead() authorizes the unrelated task ID supplied in the request path. Access to any task permits cross-project downloads; write access to any task permits deletion, and sequential IDs enable enumeration.

CVSS severity8.1
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Vikunja before 2.2.1 allows remote authenticated users to download or delete attachments across projects. TaskAttachment.ReadOne() queries only the attachment ID, while CanRead() authorizes the unrelated task ID supplied in the request path. Access to any task permits cross-project downloads; write access to any task permits deletion, and sequential IDs enable enumeration.

The record

CVE
CVE-2026-33678
Published
Mar 24, 2026
Updated
Mar 24, 2026
Vendor
Vikunja
Product
Vikunja
Classifications
CWE-639, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Vikunja · Vikunjaversion=< 2.2.1

Published CVSS scores

8.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1213Data from Information Repositories

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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