PT-2026-65576 · Superplanehq · Superplane

Katriel Moses + 1 · CVE-2026-57511 · Published 2026-07-28 · Updated 2026-07-28

NVD

CVSS v3.1

5.4

Medium

Base vector

AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

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.

Fix

Weakness Enumeration

CWE-93

Related Identifiers

CVE-2026-57511

Affected Products

Superplane

References · 5

• https://github.com/superplanehq/superplane/commit/428c559dd2fa0aef3ba825a434a1b05c9abc7df7 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-57511 · Security Note
• https://github.com/superplanehq/superplane/pull/6354 · Note
• https://github.com/superplanehq/superplane/releases/tag/v0.30.0 · Note
• https://vulncheck.com/advisories/superplane-smtp-header-injection-via-webhook-event-title · Note