{"id":"CVE-2026-115479","state":"PUBLISHED","title":"baserCMS: Mail-form auto-replies accept multiple visitor-controlled recipients","description":"baserCMS is a website development framework. In versions 5.2.5 before 5.3.2 and 5.4.0 before 5.4.2, an unauthenticated visitor can supply a comma-separated address list in a public mail form's email field and cause a single auto-reply to be addressed to multiple third parties. MailMessageMailer::sendFormToUser() passes the visitor-controlled userMail value to parseAndNormalizeMailAddresses(), which splits it with explode(',') and supplies every resulting address to setTo(). Newly created forms with an email-type field are affected when the separate, optional VALID_EMAIL server-side validation is not enabled; browser type=email validation does not prevent crafted requests. The bundled contact form enables VALID_EMAIL and is not affected. The auto-reply uses the site's sender identity and includes partially attacker-controlled content, allowing abuse of the site to deliver unsolicited mail. This issue has been patched in versions 5.3.2 and 5.4.2.","publishedAt":"2026-10-23T13:36:01.655Z","updatedAt":"2026-10-30T20:03:07.037Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["baserproject basercms"],"affected":[{"vendor":"baserproject","product":"basercms","versions":[{"version":">= 5.2.5, < 5.3.2","status":"affected"},{"version":">= 5.4.0, < 5.4.2","status":"affected"}]}],"references":["https://github.com/baserproject/basercms/security/advisories/GHSA-w47c-4g8m-gjv9","https://github.com/baserproject/basercms/commit/99e6257c9d5e2fa2bff2351defcb9fb37f69daf1","https://github.com/baserproject/basercms/releases/tag/5.3.2","https://github.com/baserproject/basercms/releases/tag/5.4.2"],"weaknesses":["CWE-20"],"ingestedAt":"2026-10-30T20:14:06.645Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/115xxx/CVE-2026-115479.json","commit":"d7f5c3fe206091a44e450f13bfe51dc81b8a7843","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-115479","state":"PUBLISHED","datePublished":"2026-10-23T13:36:01.655Z","dateUpdated":"2026-10-30T20:03:07.037Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-10-22T15:06:52.738Z"},"containers":{"cna":{"title":"baserCMS: Mail-form auto-replies accept multiple visitor-controlled recipients","descriptions":[{"lang":"en","value":"baserCMS is a website development framework. In versions 5.2.5 before 5.3.2 and 5.4.0 before 5.4.2, an unauthenticated visitor can supply a comma-separated address list in a public mail form's email field and cause a single auto-reply to be addressed to multiple third parties. MailMessageMailer::sendFormToUser() passes the visitor-controlled userMail value to parseAndNormalizeMailAddresses(), which splits it with explode(',') and supplies every resulting address to setTo(). Newly created forms with an email-type field are affected when the separate, optional VALID_EMAIL server-side validation is not enabled; browser type=email validation does not prevent crafted requests. The bundled contact form enables VALID_EMAIL and is not affected. The auto-reply uses the site's sender identity and includes partially attacker-controlled content, allowing abuse of the site to deliver unsolicited mail. This issue has been patched in versions 5.3.2 and 5.4.2."}],"affected":[{"vendor":"baserproject","product":"basercms","versions":[{"version":">= 5.2.5, < 5.3.2","status":"affected"},{"version":">= 5.4.0, < 5.4.2","status":"affected"}]}],"references":[{"url":"https://github.com/baserproject/basercms/security/advisories/GHSA-w47c-4g8m-gjv9","name":"https://github.com/baserproject/basercms/security/advisories/GHSA-w47c-4g8m-gjv9","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/baserproject/basercms/commit/99e6257c9d5e2fa2bff2351defcb9fb37f69daf1","name":"https://github.com/baserproject/basercms/commit/99e6257c9d5e2fa2bff2351defcb9fb37f69daf1","tags":["x_refsource_MISC"]},{"url":"https://github.com/baserproject/basercms/releases/tag/5.3.2","name":"https://github.com/baserproject/basercms/releases/tag/5.3.2","tags":["x_refsource_MISC"]},{"url":"https://github.com/baserproject/basercms/releases/tag/5.4.2","name":"https://github.com/baserproject/basercms/releases/tag/5.4.2","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-20","lang":"en","description":"CWE-20: Improper Input Validation","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-23T13:36:01.655Z"},"source":{"advisory":"GHSA-w47c-4g8m-gjv9","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-30T20:02:58.080021Z","id":"CVE-2026-115479","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":"2026-10-30T20:03:07.037Z"}}]}}}