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CVE-2026-91980— vikunja before 2.6.0 Team Enumeration via Project Share

Quick assessment

Affected
go-vikunja vikunja
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Vikunja 2.6.0 之前的版本在将团队关联到项目时未对团队访问权限进行验证，允许已认证用户枚举所有团队及其成员。攻击者可通过项目的团队端点（project teams endpoint）附加任意团队 ID，从而获取未授权团队的完整成员名单，包括成员姓名和管理员标记（admin flags）。

CVSS 4.3 · Medium
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I. Basic Information for CVE-2026-91980

Vulnerability Information
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Vulnerability Title
vikunja before 2.6.0 Team Enumeration via Project Share
Source: CVE Program / CVE List V5
Vulnerability Description
vikunja before 2.6.0 fails to validate team access when attaching teams to projects, allowing authenticated users to enumerate all teams and members. Attackers can attach arbitrary team IDs via the project teams endpoint to retrieve complete team rosters including member names and admin flags for unauthorized teams.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
go-vikunja vikunja 0 ~ 2.6.0 -

II. Public POCs for CVE-2026-91980

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-91980

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Vendor Advisories for CVE-2026-91980 (2)

Same Patch Batch · go-vikunja · 2026-09-15 · 13 CVEs total

CVE-2026-91972 7.5 HIGH Vikunja before 2.6.0 Authentication Bypass via Unthrottled API
CVE-2026-91985 7.5 HIGH Vikunja before 2.6.0 Privilege Escalation via Link Share Hash
CVE-2026-91973 7.5 HIGH Vikunja before 2.6.0 Authentication Bypass via CalDAV BasicAuth
CVE-2026-91968 6.5 MEDIUM vikunja before 2.6.0 Denial of Service via unbounded filter recursion
CVE-2026-91971 6.5 MEDIUM Vikunja before 2.6.0 Denial of Service via Avatar Upload
CVE-2026-91979 6.5 MEDIUM Vikunja before 2.6.0 Denial of Service via Decompression Bomb
CVE-2026-91970 6.5 MEDIUM Vikunja before 2.6.0 Resource Exhaustion via Planka Migration
CVE-2026-91969 6.5 MEDIUM vikunja before 2.6.0 Resource Exhaustion via CSV Migration
CVE-2026-91982 4.3 MEDIUM Vikunja before 2.6.0 TOTP Secret Disclosure via API
CVE-2026-91981 4.3 MEDIUM Vikunja before 2.6.0 User Enumeration via v2 API
CVE-2026-91983 4.3 MEDIUM Vikunja before 2.6.0 API Token Scope Bypass via expand Parameter
CVE-2026-91984 4.3 MEDIUM Vikunja before 2.6.0 Broken Object-Level Authorization via task-position

IV. Related Vulnerabilities

Same product: vikunja
Same vendor: go-vikunja
Same weakness: CWE-200

V. Comments for CVE-2026-91980

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