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Back to active CVEs
Medium · CVSS 4.3CVE-2026-91981GHSA-VFXW-3X8P-2VJR

Vikunja before 2.6.0 User Enumeration via v2 APICVE-2026-91981

Answer in brief

CVE-2026-91981 records a Medium severity (CVSS 4.3) vulnerability in Vikunja before 2.6.0 User Enumeration via v2 API. The current sources do not mark it as known exploited. The current feed maps go-vikunja/vikunja (generic), code.vikunja.io/api (go), code.vikunja.io/api (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 15, 2026Updated Oct 9, 2026Source checked Oct 30, 2026First seen by HOL Sep 15, 2026Material review Oct 9, 2026
Upstream Advisory

Record context

Vulnerability class
Arbitrary File Read
EPSS
Not reported
CWE IDs
CWE-200, CWE-863
Source
CVE List V5
Source checked
Oct 30, 2026
References
7 linked sources
Open source record

Key facts

Risk
Medium · CVSS 4.3
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 4.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps go-vikunja/vikunja (generic), code.vikunja.io/api (go), code.vikunja.io/api (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
go-vikunja/vikunjageneric>=0 <2.6.02.6.0
code.vikunja.io/apigo<=2.5.02.6.0
code.vikunja.io/apigo>=0 <2.6.02.6.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for go-vikunja/vikunja, code.vikunja.io/api, code.vikunja.io/api.
  2. 2Review the reported fix. Update go-vikunja/vikunja to 2.6.0; code.vikunja.io/api to 2.6.0; code.vikunja.io/api to 2.6.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 15, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • NVD vulnerability recordnvd.nist.gov
  • GitHub security advisorygithub.com
Upstream source description

Vikunja versions before 2.6.0 fail to properly validate link-share tokens in the v2 API user search endpoints. Attackers with a read-only share link can enumerate project users via the projects endpoint and confirm arbitrary usernames exist via the global search endpoint.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • PDF Reader MCP: HTTP transport accepts unauthenticated requests despite a configured MCP_API_KEYAlso CWE-200