CVE-2026-62367Network attack vectorHinoki check available

Account takeover via unverified OIDC email linking

Published Oct 9, 2026 · Updated Oct 9, 2026

Authentication bypass in Vikunja 1.0.0 through 2.3.0 allows remote attackers to take over local accounts via OIDC email fallback. In pkg/modules/auth/openid/openid.go, fallbackSearchUsers matches local accounts by email without checking email_verified or the account password. Exploitation requires non-default emailfallback and a trusted issuer that accepts the victim's unverified email, granting read, write, and delete access to that account's data; TOTP protects enrolled accounts in 2.3.0.

CVSS severity7.5
High
EPSS probability0.09%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authentication bypass in Vikunja 1.0.0 through 2.3.0 allows remote attackers to take over local accounts via OIDC email fallback. In pkg/modules/auth/openid/openid.go, fallbackSearchUsers matches local accounts by email without checking email_verified or the account password. Exploitation requires non-default emailfallback and a trusted issuer that accepts the victim's unverified email, granting read, write, and delete access to that account's data; TOTP protects enrolled accounts in 2.3.0.

The record

CVE
CVE-2026-62367
Published
Oct 9, 2026
Updated
Oct 9, 2026
Vendor
Vikunja
Product
Vikunja
Classifications
CWE-287, CWE-290, CWE-345, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 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=>= 1.0.0, < 2.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vikunja · Vikunjaversion=>= 1.0.0, < 2.4.0

Published CVSS scores

7.5GitHub Advisory DatabaseCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
CWE-290Authentication Bypass by Spoofing
CWE-345Insufficient Verification of Data Authenticity
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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