Improper control of interaction frequency in baserCMS - CVE-2026-115480
Published: October 25, 2026
Vulnerability identifier: #VU157659
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-115480
CWE-ID: CWE-799
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass image captcha protection on baserCMS mail forms and submit automated spam or abuse the site's mail service to send attacker-composed messages to third parties.
The vulnerability exists due to missing captcha verification and improper control of interaction frequency in the public mail-form API's BcMailControllerApiMailMessagesController::add() action when processing form submissions. A remote attacker can send repeated POST requests to /baser/api/bc-mail/mail_messages/add/{mailContentId}.json with valid form data but without captcha_id or auth_captcha parameters to submit messages without solving the configured captcha and trigger outgoing email.
Affected software
baserCMS
How to mitigate CVE-2026-115480
Install security update from vendor's website.
baserCMS - addressed in versions 5.3.2, 5.4.2