CVE-2026-57511

Description

SuperPlane before 0.30.0 contains an SMTP header injection vulnerability that allows unauthenticated attackers to inject arbitrary SMTP headers by including CRLF sequences in the event payload title field delivered via webhook. Attackers can manipulate the unsanitized title field passed to the SMTP DATA command to add Bcc recipients for content exfiltration, forge the From address to bypass SPF and DKIM checks, or inject Content-Type and MIME boundary headers to corrupt message bodies for phishing.

References

https://www.vulncheck.com/advisories/superplane-smtp-header-injection-via-webhook-event-title

https://github.com/superplanehq/superplane/releases/tag/v0.30.0

https://github.com/superplanehq/superplane/pull/6354

https://github.com/superplanehq/superplane/commit/428c559dd2fa0aef3ba825a434a1b05c9abc7df7

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4