CVE-2026-33473Public exploitNetwork attack vector

Account access via reusable TOTP codes

Published Mar 24, 2026 · Updated Mar 24, 2026

Improper authentication in Vikunja 0.13 through 2.2.0 allows remote authenticated users to start a second session with a captured TOTP. ValidateTOTPPasscode verifies the submitted code against the user's secret but does not record successful use, so it accepts the same code again during its 30-second window. Exploitation requires the victim's valid username, password, and current TOTP, and grants the second session the victim's authenticated access.

CVSS severity5.7
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Vikunja 0.13 through 2.2.0 allows remote authenticated users to start a second session with a captured TOTP. ValidateTOTPPasscode verifies the submitted code against the user's secret but does not record successful use, so it accepts the same code again during its 30-second window. Exploitation requires the victim's valid username, password, and current TOTP, and grants the second session the victim's authenticated access.

The record

CVE
CVE-2026-33473
Published
Mar 24, 2026
Updated
Mar 24, 2026
Vendor
Vikunja
Product
Vikunja
Classifications
CWE-287, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 24, 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=>= 0.13, < 2.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Vikunja · Vikunjaversion=>= 0.13, < 2.2.1

Published CVSS scores

5.7GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A: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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1078Valid Accounts

Public exploit references

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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