Subscribe to Comments 2.3 - 2.3.2 - Author+ Email Header Injection via From Name Setting

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-91831
StatePUBLISHED
AssignerWPScan
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-19 07:16:32 UTC
Updated2026-10-19 21:02:51 UTC
DescriptionThe Subscribe to Comments WordPress plugin before 2.3.3 does not sanitise newline characters from a notification sender-name setting before using it in e-mail headers, allowing users with Author-level access and above to inject arbitrary e-mail headers, such as a hidden Bcc, and to spoof the sender.

Risk And Classification

Primary CVSS: v3.1 3.8 LOW from [email protected]

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

Problem Types: CWE-93 | CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection') | CWE-93 CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary3.8LOWCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
3.1CNADECLARED3.8LOWCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Unknown Subscribe To Comments affected 2.3 2.3.3 semver Not specified

References

ReferenceSourceLinkTags
wpscan.com/vulnerability/6cd60f78-f5e2-4b4a-8d50-7d2bc4f981ee [email protected] wpscan.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Het Kalariya (en)

CNA: WPScan (en)

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