CVE Explorer
CVE-2026-45364
Better Auth is an authentication and authorization library for TypeScript. Prior to 1.4.17 and 1.5.0-beta.9, Better Auth's HTTP rate limiter keyed each request by the exact textual IP address it received in x-forwarded-for (or the configured IP-bearing header). IPv6 clients controlling a typical /64 allocation could rotate through 2^64 distinct source addresses without exhausting the per-address counter, defeating rate limiting on /sign-in/email, /sign-up/email, /forget-password, and every other
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"better-auth","vendor":"better-auth","versions":[{"status":"affected","version":"< 1.4.17"},{"status":"affected","version":">= 1.5.0-beta.1, < 1.5.0-beta.9"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:ffef06cab2d2b1dbaca50fc1b8e1cf14dafe4e4c94cd5b6e4979537e9257c317 · sha256:d921848519b964c7… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"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"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:ffef06cab2d2b1dbaca50fc1b8e1cf14dafe4e4c94cd5b6e4979537e9257c317 · sha256:d921848519b964c7… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-307","description":"CWE-307: Improper Restriction of Excessive Authentication Attempts","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:ffef06cab2d2b1dbaca50fc1b8e1cf14dafe4e4c94cd5b6e4979537e9257c317 · sha256:d921848519b964c7… · /containers/cna/problemTypes/0/descriptions/0
Source references
5 source assertions{"name":"https://github.com/better-auth/better-auth/commit/43e719bcc0c223c7079fa0c611a9cf7ea1188254","tags":["x_refsource_MISC"],"url":"https://github.com/better-auth/better-auth/commit/43e719bcc0c223c7079fa0c611a9cf7ea1188254"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:ffef06cab2d2b1dbaca50fc1b8e1cf14dafe4e4c94cd5b6e4979537e9257c317 · sha256:d921848519b964c7… · /containers/cna/references/3
{"name":"https://github.com/better-auth/better-auth/commit/57af0f7b910dcf7b1a5c0615d10b9bd56bb69bef","tags":["x_refsource_MISC"],"url":"https://github.com/better-auth/better-auth/commit/57af0f7b910dcf7b1a5c0615d10b9bd56bb69bef"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:ffef06cab2d2b1dbaca50fc1b8e1cf14dafe4e4c94cd5b6e4979537e9257c317 · sha256:d921848519b964c7… · /containers/cna/references/4
{"name":"https://github.com/better-auth/better-auth/pull/7470","tags":["x_refsource_MISC"],"url":"https://github.com/better-auth/better-auth/pull/7470"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:ffef06cab2d2b1dbaca50fc1b8e1cf14dafe4e4c94cd5b6e4979537e9257c317 · sha256:d921848519b964c7… · /containers/cna/references/1
{"name":"https://github.com/better-auth/better-auth/pull/7509","tags":["x_refsource_MISC"],"url":"https://github.com/better-auth/better-auth/pull/7509"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:ffef06cab2d2b1dbaca50fc1b8e1cf14dafe4e4c94cd5b6e4979537e9257c317 · sha256:d921848519b964c7… · /containers/cna/references/2
{"name":"https://github.com/better-auth/better-auth/security/advisories/GHSA-p6v2-xcpg-h6xw","tags":["x_refsource_CONFIRM"],"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-p6v2-xcpg-h6xw"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:ffef06cab2d2b1dbaca50fc1b8e1cf14dafe4e4c94cd5b6e4979537e9257c317 · sha256:d921848519b964c7… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.