CVE-2026-33312Public exploitNetwork attack vector

Project background deletion via read-only permission check

Published Mar 20, 2026 · Updated Mar 20, 2026

Incorrect authorization in Vikunja allows remote authenticated users to permanently delete project background images from shared projects. The RemoveProjectBackground handler reuses checkProjectBackgroundRights, which checks CanRead rather than CanUpdate before deleting the file and clearing its database fields. Read-only access through direct sharing, team membership, link tokens, or read-scoped API tokens is sufficient, and the deleted image cannot be recovered.

CVSS severity5.3
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Vikunja allows remote authenticated users to permanently delete project background images from shared projects. The RemoveProjectBackground handler reuses checkProjectBackgroundRights, which checks CanRead rather than CanUpdate before deleting the file and clearing its database fields. Read-only access through direct sharing, team membership, link tokens, or read-scoped API tokens is sufficient, and the deleted image cannot be recovered.

The record

CVE
CVE-2026-33312
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
Vikunja
Product
Vikunja
Classifications
CWE-863, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 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=>= 0.20.2, < 2.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Vikunja · Vikunjaversion=>= 0.20.2, < 2.2.0

Published CVSS scores

5.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-863Incorrect Authorization
T1565.001Stored Data Manipulation

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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