CVE-2026-115480 baserCMS: Public Web API mail-form submission bypasses image CAPTCHA
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-115480?
CVE-2026-115480 is a medium-severity vulnerability in baserproject basercms, published on 23 Oct 2026.
Official description
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_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.
Which versions are affected by CVE-2026-115480?
How do I fix CVE-2026-115480?
No fix has been published for CVE-2026-115480 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-115480 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-115480 exists.
Sources
Also known as GHSA-cpxq-6gjp-m59g.