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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/superplanehq/superplane/commit/428c559dd2fa0aef3ba825a434a1b…
disclosure@vulncheck.com
https://github.com/superplanehq/superplane/pull/6354
disclosure@vulncheck.com
https://github.com/superplanehq/superplane/releases/tag/v0.30.0
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/superplane-smtp-header-injection-via-webho…
disclosure@vulncheck.com