HOMEVULNERABILITIESCVE-2026-35597
MEDIUMPOC

CVE-2026-35597

CWE-307Published: April 10, 2026· Updated: Apr 13, 2026

5.9
CVSS v3.1

Official Description

Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the TOTP failed-attempt lockout mechanism is non-functional due to a database transaction handling bug. When a TOTP validation fails, the login handler in pkg/routes/api/v1/login.go calls HandleFailedTOTPAuth and then unconditionally rolls back. HandleFailedTOTPAuth in pkg/user/totp.go uses an in-memory counter (key-value store) to track failed attempts. When the counter reaches 10, it calls user.SetStatus(s, StatusAccountLocked) on the same database session s. Because the login handler always rolls back after a TOTP failure, the StatusAccountLocked write is undone. The in-memory counter correctly increments past 10, so the lockout code executes on every subsequent attempt, but the database write is rolled back every time. This allows unlimited brute-force attempts against TOTP codes. This vulnerability is fixed in 2.3.0.

NVD Source

Technical Analysis

CVE-2026-35597 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.9.

A proof-of-concept (PoC) exploit exists for CVE-2026-35597. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

Mentioned vendors (from description):
Go
CPE data not yet available in NVD for this CVE.

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists
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All References (5)

Quick Facts

CVE IDCVE-2026-35597
CVSS Score5.9 / 10
SeverityMEDIUM
WeaknessCWE-307
CISA KEVNo
ExploitPOC
PublishedApr 10, 2026

Related CVEs (CWE-307)

Recommended Actions

  • Apply vendor patches immediately
  • Monitor CVE-2026-35597 in threat intel feeds
  • Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.