{"items":[{"id":"NVI-00014070","kind":"vulnerability","title":"Better Auth affected by external request basePath modification DoS","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-569q-mpph-wgww","CVE-2025-71401"],"plain_summary":"GitHub lists this reviewed advisory for better-auth. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-053a6f591cedb0cd48840ef89f9ee15e"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"EPSS","as_of":"2026-11-02T12:00:30.000Z","value":"0.455%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.39508. Missing scores are unknown.","source_id":"sr-053a6f591cedb0cd48840ef89f9ee15e"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-3dd4a1c0828c784369f385612f121774","url":"https://github.com/advisories/GHSA-569q-mpph-wgww","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-569q-mpph-wgww","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T02:21:50.763Z"},{"id":"sr-053a6f591cedb0cd48840ef89f9ee15e","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2025-71401","publisher":"FIRST EPSS","observed_at":"2026-11-02T20:15:58.837Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-3dd4a1c0828c784369f385612f121774"],"technology":"better-auth","known_exclusions":[],"conditions_summary":"# Summary\n\nAffected versions of Better Auth allow an external request to configure `baseURL` when it isn’t defined through any other means. This can be abused to poison the router’s base path, causing all routes to return 404 for all users.\n\nThis issue is only exploitable when `baseURL` is not explicitly configured (e.g., `BETTER_AUTH_URL` is missing) *and* the attacker is able to make the very first request to the server after startup. In properly configured environments or typical managed hosting platforms, this fallback behavior cannot be reached.\n\n# Details\n\nA combination of `X-Forwarded-Host` and `X-Forwarded-Proto` is implicitly trusted. This allows the first request to configure baseURL whenever it is not explicitly configured.\n\nHere's the code that reads the headers:\n\n\n\nHere's the call to `getBaseURL()`, the result is assigned to `ctx.baseURL`.\n\n\n\nHere's the router receiving the poisoned `basePath`:\n\n<img width=\"594\"","public_affected_ranges":["< 1.4.2"]}],"null_published_at":"2026-11-03T17:49:15.005Z","source_updated_at":"2026-09-01T18:56:14.000Z","source_disclosed_at":"2025-12-01T21:29:48.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-11-02T02:21:50.763Z"},{"id":"NVI-00014070","kind":"vulnerability","title":"Better Auth affected by external request basePath modification DoS","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-569q-mpph-wgww","CVE-2025-71401"],"plain_summary":"GitHub lists this reviewed advisory for better-auth. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-3dd4a1c0828c784369f385612f121774"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-3dd4a1c0828c784369f385612f121774","url":"https://github.com/advisories/GHSA-569q-mpph-wgww","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-569q-mpph-wgww","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T02:21:50.763Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-3dd4a1c0828c784369f385612f121774"],"technology":"better-auth","known_exclusions":[],"conditions_summary":"# Summary\n\nAffected versions of Better Auth allow an external request to configure `baseURL` when it isn’t defined through any other means. This can be abused to poison the router’s base path, causing all routes to return 404 for all users.\n\nThis issue is only exploitable when `baseURL` is not explicitly configured (e.g., `BETTER_AUTH_URL` is missing) *and* the attacker is able to make the very first request to the server after startup. In properly configured environments or typical managed hosting platforms, this fallback behavior cannot be reached.\n\n# Details\n\nA combination of `X-Forwarded-Host` and `X-Forwarded-Proto` is implicitly trusted. This allows the first request to configure baseURL whenever it is not explicitly configured.\n\nHere's the code that reads the headers:\n\n\n\nHere's the call to `getBaseURL()`, the result is assigned to `ctx.baseURL`.\n\n\n\nHere's the router receiving the poisoned `basePath`:\n\n<img width=\"594\"","public_affected_ranges":["< 1.4.2"]}],"null_published_at":"2026-11-02T10:00:37.203Z","source_updated_at":"2026-09-01T18:56:14.000Z","source_disclosed_at":"2025-12-01T21:29:48.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-02T02:21:50.763Z"}],"next_cursor":null,"snapshot_revision":"42594"}