Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-62367— Vikunja: OIDC email-fallback account linking ignores email_verified, enabling local-account takeover

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 是一个开源的自托管任务管理平台。在 1.0.0 至 2.3.0 版本中，当管理员为某个 OpenID Connect（OIDC）提供商启用 per-provider 的 选项时，Vikunja 会仅根据身份提供商（IdP）提供的 声明，将单点登录（SSO）登录关联到一个预先存在的本地（用户名+密码）账户。该回退机制从不检查 （或 Microsoft 特有的 ）字段，也从不要求匹配账户的密码。如果攻击者能够从配置的 Issuer 处获取包含受害者邮箱的令牌，即可直接以该受害者身份登录，并建立完整会话，

CVSS 7.5 · High
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-62367

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Vikunja: OIDC email-fallback account linking ignores email_verified, enabling local-account takeover
Source: CVE Program / CVE List V5
Vulnerability Description
Vikunja is an open-source self-hosted task management platform. In versions 1.0.0 through 2.3.0, when an administrator enables the per-provider `emailfallback` option on an OpenID Connect provider, Vikunja links an SSO login to a pre-existing local (username+password) account using only the `email` claim from the IdP. The fallback never checks an `email_verified` (or Microsoft `xms_edov`) signal and never requires the matched account's password. An attacker who can obtain a token from the configured issuer carrying a victim's email logs in as that victim with a full session, with no consent or interaction from the victim. Version 2.4.0 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
go-vikunja vikunja >= 1.0.0, < 2.4.0 -

II. Public POCs for CVE-2026-62367

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-62367

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-62367 (1)

Vendor Advisories for CVE-2026-62367 (1)

Vendor Pages for CVE-2026-62367 (1)

Same Patch Batch · go-vikunja · 2026-10-09 · 3 CVEs total

CVE-2026-57458 8.1 HIGH Vikunja: Scoped API token can mint unrestricted OAuth session credentials
CVE-2026-62376 8.1 HIGH Vikunja: Plaintext storage of password-reset/email-confirm tokens in database enables acco

IV. Related Vulnerabilities

Same product: vikunja
Same vendor: go-vikunja
Same weakness: CWE-287

V. Comments for CVE-2026-62367

No comments yet

Leave a comment