PT-2026-30675 · Plunk+1 · Plunk+1

Romain-Deperne · CVE-2026-34975 · Published 2026-04-06 · Updated 2026-04-06

Positive Technologies (AI Summary)

CVSS v3.1

8.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Plunk versions prior to 0.8.0

Description Plunk, an email platform built on AWS SES, had a CRLF header injection issue in the SESService.ts component. User-provided data for from.name, subject, custom header keys/values, and attachment filenames was directly included in raw MIME messages without proper sanitization. An authenticated API user could inject arbitrary email headers, such as Bcc or Reply-To, by embedding carriage return/line feed characters into these fields, potentially enabling silent email forwarding, reply redirection, or sender spoofing.

Recommendations Update to version 0.8.0 or later.

Exploit

Fix

Weakness Enumeration

CWE-93

Related Identifiers

CVE-2026-34975

GHSA-2MVM-RG5V-7HFQ

Affected Products

Aws Ses

Plunk

References · 6

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34975.json · Exploit
• https://github.com/useplunk/plunk/security/advisories/GHSA-2mvm-rg5v-7hfq · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-34975 · Security Note
• https://osv.dev/vulnerability/CVE-2026-34975 · Vendor Advisory
• https://twitter.com/CveFindCom/status/2041210049264046493 · Twitter Post
• https://twitter.com/CVEnew/status/2041223981689167884 · Twitter Post