{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-58271", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-29T21:54:30.332Z", "datePublished": "2026-09-21T19:50:14.539Z", "dateUpdated": "2026-09-21T19:50:14.539Z"}, "containers": {"cna": {"title": "@sync-in/server vulnerable to TOTP Brute-Force via `POST /api/app/sync/register`", "problemTypes": [{"descriptions": [{"cweId": "CWE-307", "lang": "en", "description": "CWE-307: Improper Restriction of Excessive Authentication Attempts", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/Sync-in/server/security/advisories/GHSA-274f-6w77-8qm9", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/Sync-in/server/security/advisories/GHSA-274f-6w77-8qm9"}], "affected": [{"vendor": "Sync-in", "product": "server", "versions": [{"version": "< 2.4.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-21T19:50:14.539Z"}, "descriptions": [{"lang": "en", "value": "Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.4.0, `POST /api/app/sync/register` accepts credentials and a TOTP code to register a desktop sync client. On a failed TOTP, `SyncClientsManager.register()` calls `updateAccesses(user, ip, false)`, which hits a freeze branch that writes `passwordAttempts` back unchanged. The counter never reaches `USER_MAX_PASSWORD_ATTEMPTS` (10) and the lockout gate never fires. A successful guess returns a `{clientId, clientToken}` pair. The token can be exchanged via `POST /api/app/sync/auth/cookie` for a full JWT. While the code is valid, the attacker can also call `POST /api/auth/2fa/disable` to permanently remove MFA. Version 2.4.0 patches the issue."}], "source": {"advisory": "GHSA-274f-6w77-8qm9", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "server", "vendor": "Sync-in", "versions": [{"status": "affected", "version": "< 2.4.0"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.4.0, `POST /api/app/sync/register` accepts credentials and a TOTP code to register a desktop sync client. On a failed TOTP, `SyncClientsManager.register()` calls `updateAccesses(user, ip, false)`, which hits a freeze branch that writes `passwordAttempts` back unchanged. The counter never reaches `USER_MAX_PASSWORD_ATTEMPTS` (10) and the lockout gate never fires. A successful guess returns a `{clientId, clientToken}` pair. The token can be exchanged via `POST /api/app/sync/auth/cookie` for a full JWT. While the code is valid, the attacker can also call `POST /api/auth/2fa/disable` to permanently remove MFA. Version 2.4.0 patches the issue."}], "id": "CVE-2026-58271", "lastModified": "2026-09-21T20:17:26.993", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 5.2, "source": "[email protected]", "type": "Secondary"}]}, "published": "2026-09-21T20:17:26.993", "references": [{"source": "[email protected]", "url": "https://github.com/Sync-in/server/security/advisories/GHSA-274f-6w77-8qm9"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-307"}], "source": "[email protected]", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.4.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "server", "source": "cna", "vendor": "Sync-in"}, "product": "server", "vendor": "sync-in"}], "created": "2026-09-21T21:30:11.550720+00:00", "updated": "2026-09-21T22:15:17.698307+00:00", "vendors": ["sync-in", "sync-in$PRODUCT$server"]}