CVE-2026-28268Network attack vector

Account takeover via reusable password reset tokens

Published Feb 27, 2026 · Updated Feb 27, 2026

Business logic errors in Vikunja before 2.1.0 allow attackers with a password reset token to take over the associated account. ResetPassword deletes TokenEmailConfirm instead of TokenPasswordReset, while the cleanup cron selects tokens newer than 24 hours and leaves older reset tokens stored. Possession of one intercepted token allows repeated password resets and persistent account takeover even after the victim changes the password.

CVSS severity9.8
Critical
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Business logic errors in Vikunja before 2.1.0 allow attackers with a password reset token to take over the associated account. ResetPassword deletes TokenEmailConfirm instead of TokenPasswordReset, while the cleanup cron selects tokens newer than 24 hours and leaves older reset tokens stored. Possession of one intercepted token allows repeated password resets and persistent account takeover even after the victim changes the password.

The record

CVE
CVE-2026-28268
Published
Feb 27, 2026
Updated
Feb 27, 2026
Vendor
Vikunja
Product
Vikunja
Classifications
CWE-459, CWE-640, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 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=< 2.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vikunja · Vikunjaversion=< 2.1.0

Published CVSS scores

9.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-459Incomplete Cleanup
CWE-640Weak Password Recovery Mechanism for Forgotten Password
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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