CVE-2026-2811

Ajaxify Comments <= 3.1 - Unauthenticated HTTP Header Injection

2026-02-27 00:00

Strategic Overview

Status: Patched in 3.2
Affected Plugin: Ajaxify Comments – Ajax and Lazy Loading Comments
Affected Version: <= 3.1
CVSS: 5.3Medium
Weakness type: CWE-74 · Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CVE: CVE-2026-2811

View all Ajaxify Comments – Ajax and Lazy Loading Comments vulnerabilities

At a glance

CVE-2026-2811 is a medium-severity Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in the Ajaxify Comments WordPress plugin, affecting versions <= 3.1. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 3.2; sites on affected versions should update now. Disclosed February 2026, reported by Azmi Alsarayrah.

Vulnerability Overview

The Ajaxify Comments – Ajax and Lazy Loading Comments plugin for WordPress is vulnerable to HTTP Header Injection in all versions up to, and including, 3.1. This makes it possible for unauthenticated attackers to inject HTTP headers.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

Remediation

Update to version 3.2, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Ajaxify Comments 3.2 closes this, and updating the plugin is the step that ends it.

Firewall
Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-2811 https://www.wordfence.com/threat-intel/vulnerabilities/id/89e9cc7b-7a43-4d08-8123-5acf0782dc26 https://nvd.nist.gov/vuln/detail/CVE-2026-2811

CVSS Vector

5.3

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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