CVE-2026-91831
Low
Description
The 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.
SeverityLow
CVSS3.8
Exploit probability—
ProductSubscribe to Comments
PublishedOct 19, 2026
First seenOct 19, 2026
Weakness typeCWE-93CWE-93
How to fix
Update
- Subscribe to Comments2.3.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Subscribe to Comments | 2.3 ≤ v < 2.3.3 | 2.3.3 |
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