CVE-2021-36913Network attack vector

Unauthenticated option changes via missing capability check

Published Oct 11, 2022 · Updated Apr 28, 2026

Missing authorization in Redirection for Contact Form 7 2.4.0 and earlier allows remote attackers to alter plugin options without logging in. The publicly identified locus is only an unspecified option-update handler: it omits a capability check and accepts values that can reach footer HTML. Stored script execution requires the AccessiBe add-on to be installed, after which attacker-supplied footer content runs for site visitors.

CVSS severity7.5
High
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Redirection for Contact Form 7 2.4.0 and earlier allows remote attackers to alter plugin options without logging in. The publicly identified locus is only an unspecified option-update handler: it omits a capability check and accepts values that can reach footer HTML. Stored script execution requires the AccessiBe add-on to be installed, after which attacker-supplied footer content runs for site visitors.

The record

CVE
CVE-2021-36913
Published
Oct 11, 2022
Updated
Apr 28, 2026
Vendor
Query Solutions Ltd.
Product
Redirection for Contact Form 7
Classifications
CWE-284, CWE-74, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 2.4.0 <=2.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Query Solutions Ltd. · Redirection for Contact Form 7version=<= 2.4.0 <=2.4.0

Published CVSS scores

5.3WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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