baserCMS: Public Web API mail-form submission bypasses image CAPTCHA

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-115480
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-23 14:17:52 UTC
Updated2026-10-23 16:28:32 UTC
DescriptionbaserCMS 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Problem Types: CWE-693 | CWE-799 | CWE-799 CWE-799: Improper Control of Interaction Frequency | CWE-693 CWE-693: Protection Mechanism Failure

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Baserproject Basercms affected >= 5.0.0, < 5.3.2 Not specified
CNA Baserproject Basercms affected >= 5.4.0, < 5.4.2 Not specified

References

ReferenceSourceLinkTags
github.com/baserproject/basercms/releases/tag/5.3.2 [email protected] github.com
github.com/baserproject/basercms/commit/3444154ca40f308ade8991e54459248f... [email protected] github.com
github.com/baserproject/basercms/security/advisories/GHSA-cpxq-6gjp-m59g [email protected] github.com
github.com/baserproject/basercms/releases/tag/5.4.2 [email protected] github.com
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