{"id":"CVE-2026-112374","state":"PUBLISHED","title":"FOSSBilling before 0.8.9 Login CSRF via Staff Guest Login API","description":"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.","publishedAt":"2026-10-30T12:10:37.508Z","updatedAt":"2026-10-30T12:10:37.508Z","severity":{"score":5.1,"label":"Medium","version":"4.0","vector":"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","source":"VulnCheck"},"assigner":"VulnCheck","products":["FOSSBilling FOSSBilling"],"affected":[{"vendor":"FOSSBilling","product":"FOSSBilling","packageURL":"pkg:github/FOSSBilling/FOSSBilling","defaultStatus":"unaffected","versions":[{"version":"0.1.0","status":"affected","lessThan":"0.8.9","versionType":"semver"}],"repo":"https://github.com/FOSSBilling/FOSSBilling"}],"references":["https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-h7w3-wp25-gf86","https://github.com/FOSSBilling/FOSSBilling/releases/tag/0.8.9","https://www.vulncheck.com/advisories/fossbilling-before-login-csrf-via-staff-guest-login-api"],"weaknesses":["CWE-352"],"ingestedAt":"2026-10-30T12:34:06.950Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/112xxx/CVE-2026-112374.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-112374","state":"PUBLISHED","datePublished":"2026-10-30T12:10:37.508Z","dateUpdated":"2026-10-30T12:10:37.508Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-19T16:11:44.247Z"},"containers":{"cna":{"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."}],"affected":[{"vendor":"FOSSBilling","product":"FOSSBilling","packageURL":"pkg:github/FOSSBilling/FOSSBilling","defaultStatus":"unaffected","versions":[{"version":"0.1.0","status":"affected","lessThan":"0.8.9","versionType":"semver"}],"repo":"https://github.com/FOSSBilling/FOSSBilling"}],"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"]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-352","lang":"en","description":"Cross-Site Request Forgery (CSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-30T12:10:37.508Z"},"tags":["x_open-source"],"datePublic":"2026-10-30T00:00:00.000Z","cpeApplicability":[{"operator":"OR","nodes":[{"operator":"OR","cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:fossbilling:fossbilling:-:*:*:*:*:*:*:*","versionStartIncluding":"0.1.0","versionEndExcluding":"0.8.9"}]}]}],"credits":[{"lang":"en","value":"Komiljon Ayubov","type":"finder"}],"x_generator":{"engine":"vulncheck"}}}}}