{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-48558: SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-48558","status":"final","version":"1","initial_release_date":"2026-06-12T17:07:05.453Z","current_release_date":"2026-06-13T03:56:09.983Z","revision_history":[{"date":"2026-06-12T17:07:05.453Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"SimpleHelp versions 5.5.15 and prior and 6.0 pre-release versions contain an authentication bypass vulnerability in the OIDC authentication flow. When OIDC authentication is configured, identity tokens submitted during login are accepted without verifying their cryptographic signature. In a vulnerable configuration, a remote, unauthenticated attacker can submit a forged token containing arbitrary identity claims to obtain a fully authenticated technician session. In some configurations, this may also allow bypass of multi-factor authentication. No user interaction is required.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-48558 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-48558"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-48558"},{"category":"external","summary":"horizon3.ai","url":"https://horizon3.ai/attack-research/disclosures/cve-2026-48558-simplehelp-authentication-bypass-iocs/"},{"category":"external","summary":"simple-help.com","url":"https://simple-help.com/security/simplehelp-security-update-2026-05"},{"category":"external","summary":"simple-help.com","url":"https://simple-help.com/release-news"}]},"product_tree":{"branches":[{"category":"vendor","name":"SimpleHelp","branches":[{"category":"product_name","name":"SimpleHelp","branches":[{"category":"product_version_range","name":">=5.5.0 <5.5.16","product":{"name":"SimpleHelp SimpleHelp >=5.5.0 <5.5.16","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:simplehelp:simplehelp:*:*:*:*:*:*:*:*"}}},{"category":"product_version_range","name":">=6.0 <6.0 RC2","product":{"name":"SimpleHelp SimpleHelp >=6.0 <6.0 RC2","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:simplehelp:simplehelp:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-48558","title":"SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification","notes":[{"category":"description","text":"SimpleHelp versions 5.5.15 and prior and 6.0 pre-release versions contain an authentication bypass vulnerability in the OIDC authentication flow. When OIDC authentication is configured, identity tokens submitted during login are accepted without verifying their cryptographic signature. In a vulnerable configuration, a remote, unauthenticated attacker can submit a forged token containing arbitrary identity claims to obtain a fully authenticated technician session. In some configurations, this may also allow bypass of multi-factor authentication. No user interaction is required.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","baseScore":9.5,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1","CSAFPID-2"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 5.5.16, 6.0 RC2.","product_ids":["CSAFPID-1","CSAFPID-2"]}]}]}