What’s Vulnerable › Vulnerabilities

CVE-2026-111358: SendPortal sendportal-core through 4.0.1 Cross-Workspace Tag Attachment via Subscriber Form

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-15 · updated 2026-10-16
• Weakness: CWE-639

Description

SendPortal sendportal-core through 4.0.1 contains an authorization bypass vulnerability that allows authenticated workspace members to attach subscribers to other workspaces' tags by supplying unvalidated tag IDs. Attackers can submit sequential tag IDs via the web subscriber form or CSV import to receive victim campaign content and skew victim reports.

Affected products

• mettle sendportal-core: through 4.0.1

References

• https://github.com/mettle/sendportal-core
• https://github.com/mettle/sendportal-core/blob/v4.0.1/src/Http/Requests/SubscriberRequest.php#L34-L37
• https://github.com/mettle/sendportal-core/blob/v4.0.1/src/Repositories/Subscribers/BaseSubscriberTenantRepository.php#L48-L51
• https://hackmd.io/@hieuPenguinnn/sendportal-subscriber-tags-cross-workspace-attach
• https://www.vulncheck.com/advisories/sendportal-sendportal-core-through-4.0.1-cross-workspace-tag-attachment-via-subscriber-form
• https://hackmd.io/@hieuPenguinnn/sendportal-subscriber-tags-cross-workspace-attach

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