{"id":"CVE-2026-43914","state":"PUBLISHED","title":"Vaultwarden: Brute-force protection bypass vulnerability","description":"Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.4, there is a security vulnerability in Vaultwarden that allows bypassing the login brute-force protection if email 2fa is enabled. If email 2fa is enabled, the unprotected 2fa-function send_email_login (email.rs, api endpoint /api/two-factor/send-email-login) also acts as an oracle determining whether a username-password combination is correct. An attacker can abuse that endpoint to brute-force passwords without rate-limiting. This works even for users who don't have email 2fa configured. This vulnerability is fixed in 1.35.4.","publishedAt":"2026-05-11T22:03:58.456Z","updatedAt":"2026-05-12T12:51:49.183Z","severity":{"score":7.3,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["dani-garcia vaultwarden"],"affected":[{"vendor":"dani-garcia","product":"vaultwarden","versions":[{"version":"< 1.35.4","status":"affected"}]}],"references":["https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4g","https://github.com/dani-garcia/vaultwarden/pull/6867","https://github.com/dani-garcia/vaultwarden/releases/tag/1.35.4"],"weaknesses":["CWE-307"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43914.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43914","state":"PUBLISHED","datePublished":"2026-05-11T22:03:58.456Z","dateUpdated":"2026-05-12T12:51:49.183Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-04T16:11:33.086Z"},"containers":{"cna":{"title":"Vaultwarden: Brute-force protection bypass vulnerability","descriptions":[{"lang":"en","value":"Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.4, there is a security vulnerability in Vaultwarden that allows bypassing the login brute-force protection if email 2fa is enabled. If email 2fa is enabled, the unprotected 2fa-function send_email_login (email.rs, api endpoint /api/two-factor/send-email-login) also acts as an oracle determining whether a username-password combination is correct. An attacker can abuse that endpoint to brute-force passwords without rate-limiting. This works even for users who don't have email 2fa configured. This vulnerability is fixed in 1.35.4."}],"affected":[{"vendor":"dani-garcia","product":"vaultwarden","versions":[{"version":"< 1.35.4","status":"affected"}]}],"references":[{"url":"https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4g","name":"https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4g","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/dani-garcia/vaultwarden/pull/6867","name":"https://github.com/dani-garcia/vaultwarden/pull/6867","tags":["x_refsource_MISC"]},{"url":"https://github.com/dani-garcia/vaultwarden/releases/tag/1.35.4","name":"https://github.com/dani-garcia/vaultwarden/releases/tag/1.35.4","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.3,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-307","lang":"en","description":"CWE-307: Improper Restriction of Excessive Authentication Attempts","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-11T22:03:58.456Z"},"source":{"advisory":"GHSA-c5rv-q295-7w4g","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4g","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-12T12:51:45.245041Z","id":"CVE-2026-43914","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-12T12:51:49.183Z"}}]}}}