Cookie Validation Flaw in Subscribe to Comments Plugin Affects WordPress
CVE-2026-91830
Key Information:
- Vendor
WordPress
- Status
- Vendor
- CVE Published:
- 16 October 2026
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What is CVE-2026-91830?
The Subscribe to Comments Plugin for WordPress, before version 2.3.3, suffers from a serious cookie validation flaw. This vulnerability allows unauthenticated attackers to exploit the lack of signing or validation on a trusted cookie used to identify commenters. As a result, an attacker can potentially disclose a subscriber's management key and silently alter their subscription preferences without authorization. This makes it essential for users of the affected versions to update promptly to safeguard their data and maintain the integrity of their subscriber management.
Affected Version(s)
Subscribe to Comments 0 < 2.3.3
Exploit Proof of Concept (PoC)
PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.