CVE-2026-35597

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{"affected": [{"affectedData": [{"product": "vikunja", "vendor": "go-vikunja", "versions": [{"status": "affected", "version": "< 2.3.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*", "matchCriteriaId": "CC8B46CF-6E7B-46F4-8275-D1A38F2A6D5E", "versionEndExcluding": "2.3.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Vikunja es una plataforma de gesti\u00f3n de tareas de c\u00f3digo abierto y autoalojada. Antes de la versi\u00f3n 2.3.0, el mecanismo de bloqueo por intentos fallidos de TOTP no funciona debido a un error en el manejo de transacciones de la base de datos. Cuando falla una validaci\u00f3n de TOTP, el gestor de inicio de sesi\u00f3n en pkg/routes/api/v1/login.go llama a HandleFailedTOTPAuth y luego revierte incondicionalmente. HandleFailedTOTPAuth en pkg/user/totp.go utiliza un contador en memoria (almac\u00e9n clave-valor) para rastrear los intentos fallidos. Cuando el contador alcanza 10, llama a user.SetStatus(s, StatusAccountLocked) en la misma sesi\u00f3n de base de datos s. Debido a que el gestor de inicio de sesi\u00f3n siempre revierte despu\u00e9s de un fallo de TOTP, la escritura de StatusAccountLocked se deshace. El contador en memoria se incrementa correctamente m\u00e1s all\u00e1 de 10, por lo que el c\u00f3digo de bloqueo se ejecuta en cada intento posterior, pero la escritura en la base de datos se revierte cada vez. Esto permite intentos ilimitados de fuerza bruta contra c\u00f3digos TOTP. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 2.3.0."}], "id": "CVE-2026-35597", "lastModified": "2026-10-26T22:10:00.163", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-35597", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-13T15:28:33.633956Z", "version": "2.0.3"}}]}, "published": "2026-04-10T17:17:03.217", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/go-vikunja/vikunja/commit/6ca0151d02fa0e8c7e2181ab916a28e08caaaec8"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking"], "url": "https://github.com/go-vikunja/vikunja/pull/2576"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-fgfv-pv97-6cmj"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-fgfv-pv97-6cmj"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-307"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.3.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "vikunja", "source": "cna", "vendor": "go-vikunja"}, "product": "vikunja", "vendor": "go-vikunja"}], "analysis": {"en": {"generated_at": "2026-04-10T17:22:24.464773+00:00", "value": {"mitigation_remediation": ["Upgrade Vikunja to version 2.3.0 or later to apply the patch that correctly persists account lockout status.", "If an upgrade cannot be performed immediately, monitor authentication logs for excessive TOTP failures and temporarily block accounts that exceed a threshold.", "Consider disabling two\u2011factor authentication for critical accounts until the update is applied, or enforce stricter rate\u2011limiting on login attempts."], "summary": {"action": "Immediate Patch", "impact": "Brute\u2011force authentication bypass"}, "threat_synthesis": {"affected_systems": "The issue affects the Vikunja task\u2011management platform, provided by the go\u2011vikunja organization. Any deployment of Vikunja version 2.2.x or earlier is vulnerable. The problem is resolved in release 2.3.0 and later. Users running earlier versions on external servers or internal infrastructure are at risk.", "description_and_impact": "An in\u2011memory counter records TOTP failures, but the lockout state is not persisted because a database rollback undoes the status change. When an attacker supplies an incorrect TOTP code, the account never locks, allowing unlimited attempts to guess a correct code. This flaw permits brute\u2011force authentication of two\u2011factor protected accounts. The weakness is captured by CWE\u2011307 and results in elevated access without valid second factor, leading to potential unauthorized data exposure and modification.", "risk_and_exploitability": "The CVSS base score of 5.9 indicates moderate severity. No EPSS information is available, and the vulnerability is not listed in the CISA KEV catalog. Because the flaw operates during the login phase, it can be exploited over the network when an attacker can supply a username and repeated TOTP attempts, or locally if the attacker can guess a valid username. The attack vector is therefore likely remote network login or local compromise, and an attacker can gain access after sufficient failed TOTP attempts because the lockout never persists."}}}}, "created": "2026-04-13T12:44:16.928509+00:00", "updated": "2026-04-13T13:00:46.451909+00:00", "vendors": ["go-vikunja", "go-vikunja$PRODUCT$vikunja"]}