CVE-2026-115479 baserCMS: Mail-form auto-replies accept multiple visitor-controlled recipients
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-115479?
CVE-2026-115479 is a medium-severity vulnerability in baserproject basercms, published on 23 Oct 2026.
Official 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.
Weakness: CWE-20
Which versions are affected by CVE-2026-115479?
How do I fix CVE-2026-115479?
No fix has been published for CVE-2026-115479 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-115479 being exploited?
There is no known exploitation of CVE-2026-115479 in the wild and no public exploit code.
Sources
Also known as GHSA-w47c-4g8m-gjv9.