{"id":"CVE-2026-48780","state":"PUBLISHED","title":"Forem vulnerable to bypass of email address domain restrictions","description":"Forem is open source software for building communities. Prior to commit a2ab6d4, a maliciously crafted email address could allow an attacker to bypass domain allowlist or denylist restrictions and gain access to invite-only forem deployments. The issue is patched as of `a2ab6d4`. As a workaround, some SMTP servers and email delivery providers may drop or refuse to send maliciously crafted email addresses.","publishedAt":"2026-06-16T14:10:27.047Z","updatedAt":"2026-06-17T13:49:28.484Z","severity":{"score":8.2,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["forem forem"],"affected":[{"vendor":"forem","product":"forem","versions":[{"version":"< a2ab6d4","status":"affected"}]}],"references":["https://github.com/forem/forem/security/advisories/GHSA-3g4h-9h37-mpx6","https://github.com/forem/forem/commit/a2ab6d409d2676eb0711ecbd737192043125b437"],"weaknesses":["CWE-287"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/48xxx/CVE-2026-48780.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-48780","state":"PUBLISHED","datePublished":"2026-06-16T14:10:27.047Z","dateUpdated":"2026-06-17T13:49:28.484Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-22T20:18:20.365Z"},"containers":{"cna":{"title":"Forem vulnerable to bypass of email address domain restrictions","descriptions":[{"lang":"en","value":"Forem is open source software for building communities. Prior to commit a2ab6d4, a maliciously crafted email address could allow an attacker to bypass domain allowlist or denylist restrictions and gain access to invite-only forem deployments. The issue is patched as of `a2ab6d4`. As a workaround, some SMTP servers and email delivery providers may drop or refuse to send maliciously crafted email addresses."}],"affected":[{"vendor":"forem","product":"forem","versions":[{"version":"< a2ab6d4","status":"affected"}]}],"references":[{"url":"https://github.com/forem/forem/security/advisories/GHSA-3g4h-9h37-mpx6","name":"https://github.com/forem/forem/security/advisories/GHSA-3g4h-9h37-mpx6","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/forem/forem/commit/a2ab6d409d2676eb0711ecbd737192043125b437","name":"https://github.com/forem/forem/commit/a2ab6d409d2676eb0711ecbd737192043125b437","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-287","lang":"en","description":"CWE-287: Improper Authentication","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-06-16T14:10:27.047Z"},"source":{"advisory":"GHSA-3g4h-9h37-mpx6","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-17T13:49:19.212215Z","id":"CVE-2026-48780","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-17T13:49:28.484Z"}}]}}}