TI-2026-79892 Aliases CVE-2026-115479

Multiple recipients accepted in baserCMS mail-form auto-replies

LOW 30CWE-20Published 2026-10-23 · Updated 2026-10-30

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

baserCMS is affected in versions from 5.2.5 before 5.3.2 and from 5.4.0 before 5.4.2. Improper input validation (CWE-20) lets an unauthenticated visitor enter a comma-separated list of addresses in a public mail form's email field, so one auto-reply goes to several third parties. Only new forms with an email-type field are affected when the optional VALID_EMAIL check is disabled. The site's sender identity sends the auto-reply, so the site can be abused to send unsolicited mail.

Written with Claude Haiku 5.5 from the sources below · 2026-10-30

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00302 23rd percentileScored 2026-11-07

Fix Fixed basercms (baserproject): 5.3.2, 5.4.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
baserproject	basercms	5.2.5 to before 5.3.2; 5.4.0 to before 5.4.2	5.3.2, 5.4.2	Patch available	CNA

basercms Vendorbaserproject Affected 5.2.5 to before 5.3.2; 5.4.0 to before 5.4.2 Fixed in 5.3.2, 5.4.2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:basercms:basercms::::::::	—	—	baserproject

cpe:2.3:a:basercms:basercms:*:*:*:*:*:*:*:* Versions — — ·baserproject

Remediation

Update baserCMS to version 5.3.2 or 5.4.2, which fix the issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-30

Fix · CNA basercms (baserproject) Fixed in 5.3.2, 5.4.2

Timeline

2026-10-23 Threatist record created from CVE-2026-115479
2026-10-30 CISA SSVC decision points changed

References

Other 4

TI-2026-53549 baserCMS < 5.3.0 SQL Injection and Code Injection via BcDatabaseService.php CVSS 4.0HIGH 8.6
TI-2026-17563 baserCMS: OS Command Injection Leading to Remote Code Execution (RCE) CVSS 3.1CRITICAL 9.1
TI-2025-23967 baserCMS: unsafe File Upload Leading to Remote Code Execution (RCE) CVSS 3.1HIGH 8.7
TI-2026-79890 PHP object injection in baserCMS widget-area entity CVSS 3.1HIGH 7.2
TI-2026-79888 baserCMS: Encoded path traversal bypass in the theme file API CVSS 3.1HIGH 7.2
TI-2026-79891 Stored cross-site scripting in baserCMS via blog comment shortcodes CVSS 3.1HIGH 7.1

See all 78 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences