{"id":"CVE-2026-115480","title":"baserCMS: Public Web API mail-form submission bypasses image CAPTCHA","summary":"baserCMS is a website development framework. In versions 5.0.0 before 5.3.2 and 5.4.0 before 5.4.2, the public POST /baser/api/bc-mail/mail_messages/add/{mailContentId}.json endpoint accepts submissions without enforcing the form's auth_…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","cvssSource":"cna","cwe":["CWE-799","CWE-693"],"vendor":"baserproject","product":"basercms","affected":["basercms >= 5.0.0, < 5.3.2","basercms >= 5.4.0, < 5.4.2"],"published":"2026-10-23","updated":"2026-10-23","sourceUpdated":"2026-10-23T13:37:32.184Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115480","references":[{"url":"https://github.com/baserproject/basercms/security/advisories/GHSA-cpxq-6gjp-m59g","label":"https://github.com/baserproject/basercms/security/advisories/GHSA-cpxq-6gjp-m59g"},{"url":"https://github.com/baserproject/basercms/commit/3444154ca40f308ade8991e54459248f866dcf61","label":"https://github.com/baserproject/basercms/commit/3444154ca40f308ade8991e54459248f866dcf61"},{"url":"https://github.com/baserproject/basercms/releases/tag/5.3.2","label":"https://github.com/baserproject/basercms/releases/tag/5.3.2"},{"url":"https://github.com/baserproject/basercms/releases/tag/5.4.2","label":"https://github.com/baserproject/basercms/releases/tag/5.4.2"}],"tags":["cve.org"],"ingestedAt":"2026-10-23T14:28:08.704Z","slug":"CVE-2026-115480","body":"## Overview\n\nbaserCMS is a website development framework. In versions 5.0.0 before 5.3.2 and 5.4.0 before 5.4.2, the public POST /baser/api/bc-mail/mail_messages/add/{mailContentId}.json endpoint accepts submissions without enforcing the form's auth_captcha setting. BcMail\\Controller\\Api\\MailMessagesController::add() and MailMessagesService::create() omit the BcCaptchaService::check() verification of captcha_id and auth_captcha performed by MailController::submit() in the web UI. An unauthenticated attacker who can reach the API can therefore automate submissions without solving the enabled image challenge. The API disables FormProtection and has no rate limit; submissions can generate administrator-inbox spam, send attacker-influenced auto-replies to third parties when an email field is present, and accumulate mail_messages database records when save_info is enabled. The API already enforces the isAccepting() check added for CVE-2026-30878; the missing CAPTCHA check is a separate control failure. This issue has been patched in versions 5.3.2 and 5.4.2.\n\n## Affected\n\n- `basercms >= 5.0.0, < 5.3.2`\n- `basercms >= 5.4.0, < 5.4.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}