CVE-2026-33680Public exploitNetwork attack vector

Permission escalation via unchecked link share listing

Published Mar 24, 2026 · Updated Mar 24, 2026

Improper authorization in Vikunja before 2.2.2 allows remote attackers with a read-only link share to obtain higher-privilege share hashes. LinkSharing.ReadAll() checks only project-level read access, and ReadAllWeb returns every share's bearer hash without invoking LinkSharing.CanRead(). A read-only link share URL is sufficient to authenticate with a disclosed write or admin hash and gain that share's permissions on the same project.

CVSS severity7.5
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Vikunja before 2.2.2 allows remote attackers with a read-only link share to obtain higher-privilege share hashes. LinkSharing.ReadAll() checks only project-level read access, and ReadAllWeb returns every share's bearer hash without invoking LinkSharing.CanRead(). A read-only link share URL is sufficient to authenticate with a disclosed write or admin hash and gain that share's permissions on the same project.

The record

CVE
CVE-2026-33680
Published
Mar 24, 2026
Updated
Mar 24, 2026
Vendor
Vikunja
Product
Vikunja
Classifications
CWE-285, T1550.001
Attack vector
network
Privileges
unauthenticated

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=< 2.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vikunja · Vikunjaversion=< 2.2.2

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-285Improper Authorization
T1550.001Application Access Token

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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