SEPTEMBER 17, 2026
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Case File

CVE-2026-91981

MEDIUM · CVSS 4.3 EPSS 0.24% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-15 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

Vikunja versions prior to 2.6.0 are vulnerable due to inadequate validation of link-share tokens in the v2 API user search endpoints, allowing attackers with read-only share links to enumerate project users and confirm the existence of arbitrary usernames. This could lead to information disclosure and potential targeting of users. Organizations using affected versions should prioritize updating to mitigate the risk of unauthorized user enumeration.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-91981
Severity
MEDIUM
CVSS
4.3
EPSS
0.24%

Original NVD 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.