CVE-2026-57511 Details
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.
A CRLF injection vulnerability has been identified in SuperPlane versions prior to 0.30.0, allowing unauthenticated attackers to inject arbitrary SMTP headers. This is achieved by including CRLF sequences in the event payload title field delivered via webhook. The vulnerability arises because the title field is not properly sanitized before being passed to the SMTP DATA command. Exploitation of this vulnerability could enable attackers 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 purposes.
Users can update to SuperPlane version 0.30.0 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 28, 2026CISA-ADP
Assessed Jul 29, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/superplanehq/superplane/commit/428c559dd2fa0aef3ba825a434a1b05c9abc7df7 | [email protected] | Source CodeVendor |
| https://github.com/superplanehq/superplane/pull/6354 | [email protected] | Issue TrackingVendor |
| https://github.com/superplanehq/superplane/releases/tag/v0.30.0 | [email protected] | Release NotesVendor |
| https://www.vulncheck.com/advisories/superplane-smtp-header-injection-via-webhook-event-title | [email protected] | AdvisoryRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-93 | Improper Neutralization of CRLF Sequences ('CRLF Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| SuperPlane | < 0.30.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 29, 2026 | CVE Modified | CISA-ADP |
| Jul 28, 2026 | New CVE Received | [email protected] |