{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-112374","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-10-19T16:11:44.247Z","datePublished":"2026-10-30T12:10:37.508Z","dateUpdated":"2026-10-30T12:10:37.508Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-10-30T12:10:37.508Z"},"title":"FOSSBilling before 0.8.9 Login CSRF via Staff Guest Login API","descriptions":[{"lang":"en","value":"FOSSBilling before 0.8.9 contains a Cross-Site Request Forgery vulnerability in the staff guest login endpoint (POST /api/guest/staff/login) that allows remote attackers to force authentication because checkGuestClientAuthentication() only allowlists client_login and client_create, leaving staff_login without CSRF or Origin validation. Attackers can host an auto-submitting HTML form with attacker-controlled credentials to silently log a victim's browser into the attacker's staff account."}],"tags":["x_open-source"],"datePublic":"2026-10-30T00:00:00.000Z","problemTypes":[{"descriptions":[{"lang":"en","description":"Cross-Site Request Forgery (CSRF)","cweId":"CWE-352","type":"CWE"}]}],"affected":[{"defaultStatus":"unaffected","vendor":"FOSSBilling","product":"FOSSBilling","packageURL":"pkg:github/FOSSBilling/FOSSBilling","repo":"https://github.com/FOSSBilling/FOSSBilling","versions":[{"status":"affected","version":"0.1.0","versionType":"semver","lessThan":"0.8.9"}]}],"cpeApplicability":[{"operator":"OR","nodes":[{"operator":"OR","cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:fossbilling:fossbilling:-:*:*:*:*:*:*:*","versionStartIncluding":"0.1.0","versionEndExcluding":"0.8.9"}]}]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"MEDIUM","baseScore":5.1,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE","version":"3.1","baseSeverity":"MEDIUM","baseScore":4.3,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N"}}],"references":[{"url":"https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-h7w3-wp25-gf86","name":"Vendor Advisory","tags":["vendor-advisory","technical-description"]},{"url":"https://github.com/FOSSBilling/FOSSBilling/releases/tag/0.8.9","name":"Vendor Patch","tags":["patch","issue-tracking"]},{"url":"https://www.vulncheck.com/advisories/fossbilling-before-login-csrf-via-staff-guest-login-api","name":"VulnCheck Advisory: FOSSBilling before 0.8.9 Login CSRF via Staff Guest Login API","tags":["third-party-advisory"]}],"credits":[{"lang":"en","value":"Komiljon Ayubov","type":"finder"}],"x_generator":{"engine":"vulncheck"}}}}