CVE-2026-111358

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.

CVSS 4.0

5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 24% of CVEs (scores of 2026-10-25)

CWE

CWE-639

Published

2026-10-15

Modified

2026-10-16

Record from

the NVD, synced 2026-10-19

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

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