CVE-2026-35596Public exploitNetwork attack vector

Authenticated label metadata disclosure via ungrouped SQL predicates

Published Apr 10, 2026 · Updated Apr 10, 2026

Incorrect authorization in Vikunja before 2.3.0 allows remote authenticated users to read cross-project label metadata via the API. The hasAccessToLabel query combines OR and AND predicates without explicit grouping, so SQL precedence leaves the label identifier constraint bound only to the project-access branch. Any account can enumerate sequential label IDs, but disclosure is limited to labels attached to at least one task and exposes titles, descriptions, colors, and creator details.

CVSS severity4.3
Medium
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

Incorrect authorization in Vikunja before 2.3.0 allows remote authenticated users to read cross-project label metadata via the API. The hasAccessToLabel query combines OR and AND predicates without explicit grouping, so SQL precedence leaves the label identifier constraint bound only to the project-access branch. Any account can enumerate sequential label IDs, but disclosure is limited to labels attached to at least one task and exposes titles, descriptions, colors, and creator details.

The record

CVE
CVE-2026-35596
Published
Apr 10, 2026
Updated
Apr 10, 2026
Vendor
Vikunja
Product
Vikunja
Classifications
CWE-863, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 10, 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=< 2.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Vikunja · Vikunjaversion=< 2.3.0

Published CVSS scores

4.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
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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