Vulnerability · Published Oct 19, 2026 · Assigned by WPScan
CVE-2026-91831Subscribe to Comments 2.3 - 2.3.2 - Author+ Email Header Injection via From Name Setting
Low 3.8
In plain English
A low-severity security flaw in Subscribe to Comments from Unknown. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).
Severity (CVSS 3.1)3.8Low
Exploit odds (30 days)0.2%top 94.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Unknown | Subscribe to Comments | 2.3 – before 2.3.3 |
Weakness: CWE-93 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
References
- https://wpscan.com/vulnerability/6cd60f78-f5e2-4b4a-8d50-7d2bc4f981ee/ exploit, vdb-entry, technical-description