{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-56073: Cap-go - OTP Bypass via Response Manipulation in Email Verification","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-56073","status":"final","version":"1","initial_release_date":"2026-06-19T21:39:18.855Z","current_release_date":"2026-06-19T21:39:18.855Z","revision_history":[{"date":"2026-06-19T21:39:18.855Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"Cap-go before 12.128.2 contains an authentication bypass vulnerability in OTP verification that allows attackers to bypass email verification by modifying server responses. Attackers can intercept OTP verification requests and manipulate HTTP responses to falsely mark verification successful, enabling unauthorized 2FA enablement and account takeover.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-56073 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-56073"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-56073"},{"category":"external","summary":"GHSA Advisory GHSA-x2gq-85v8-j9v4","url":"https://github.com/Cap-go/capgo/security/advisories/GHSA-x2gq-85v8-j9v4"},{"category":"external","summary":"VulnCheck Advisory: Cap-go - OTP Bypass via Response Manipulation in Email Verification","url":"https://www.vulncheck.com/advisories/cap-go-otp-bypass-via-response-manipulation-in-email-verification"}]},"product_tree":{"branches":[{"category":"vendor","name":"Cap-go","branches":[{"category":"product_name","name":"capgo","branches":[{"category":"product_version_range","name":"<12.128.2","product":{"name":"Cap-go capgo <12.128.2","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:cap-go:capgo:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"12.128.2","product":{"name":"Cap-go capgo 12.128.2","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:cap-go:capgo:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-56073","title":"Cap-go - OTP Bypass via Response Manipulation in Email Verification","notes":[{"category":"description","text":"Cap-go before 12.128.2 contains an authentication bypass vulnerability in OTP verification that allows attackers to bypass email verification by modifying server responses. Attackers can intercept OTP verification requests and manipulate HTTP responses to falsely mark verification successful, enabling unauthorized 2FA enablement and account takeover.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"],"fixed":["CSAFPID-2"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N","baseScore":9.3,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 12.128.2.","product_ids":["CSAFPID-1"]}]}]}