CVE-2022-4011Public exploitNetwork attack vector

Audit-log corruption via unescaped forwarding header

Published Nov 16, 2022 · Updated Apr 14, 2025

Log injection in Simple History for WordPress allows remote attackers to corrupt audit records through a crafted X-Forwarded-For header. The Header Handler writes attacker-controlled X-Forwarded-For content into logs without adequate output encoding or escaping; no function or file has been publicly identified. Any unauthenticated client able to reach WordPress can supply the header, allowing forged or malformed log content that undermines audit integrity and can interrupt log handling.

CVSS severity9.8
Critical
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Log injection in Simple History for WordPress allows remote attackers to corrupt audit records through a crafted X-Forwarded-For header. The Header Handler writes attacker-controlled X-Forwarded-For content into logs without adequate output encoding or escaping; no function or file has been publicly identified. Any unauthenticated client able to reach WordPress can supply the header, allowing forged or malformed log content that undermines audit integrity and can interrupt log handling.

The record

CVE
CVE-2022-4011
Published
Nov 16, 2022
Updated
Apr 14, 2025
Vendor
Pär Thernström
Product
Simple History
Classifications
CWE-116, CWE-707
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 16, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Pär Thernström · Simple Historyversion=n/a

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.5VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

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.

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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 exploitPublished

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
CWE-707Improper Neutralization

Public exploit references

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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