Security readout for executives and security teams
Plain-English summary
This issue lets a blocked visitor get around WP Cerber Security's IP blocking by presenting a different client IP value in an HTTP forwarding header. It does not expose data or directly take a site down, but it weakens a control many WordPress sites use to stop abusive traffic.
Executive priority
Treat this as a moderate WordPress control-bypass issue. Prioritize sites where WP Cerber IP blocking is used to manage abuse, credential attacks, or access restrictions, but it is not a critical remote code execution or data theft finding based on the provided evidence.
Technical view
WP Cerber Security, Anti-spam & Malware Scan versions up to and including 9.4 improperly checked the visitor IP address. A remote unauthenticated attacker with a blocked IP could bypass IP protection by supplying an X-Forwarded-For value representing an unblocked IP. The CVSS 3.1 score is 5.3, mapped to CWE-693.
Likely exposure
Exposure is limited to WordPress sites running WP Cerber Security, Anti-spam & Malware Scan version 9.4 or earlier, especially where administrators rely on plugin-level IP blocking as a security or abuse-prevention control.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. The issue is remotely reachable, requires no authentication or user interaction, and has low attack complexity, but its documented impact is integrity-only bypass of IP protection.
Researcher notes
The provided evidence supports an IP protection bypass in WP Cerber through improper visitor IP handling and references a WordPress Trac changeset. The bundle does not provide confirmed active exploitation, a named fixed version, or broader product impact beyond WP Cerber Security version 9.4 and earlier.
Mitigation direction
- Identify WordPress sites using WP Cerber Security, Anti-spam & Malware Scan.
- Upgrade from affected versions if vendor guidance identifies a fixed release.
- Review WP Cerber and WordPress plugin guidance for supported remediation details.
- Do not rely solely on plugin IP blocking for high-risk access control.
- Validate trusted proxy and client IP handling at the edge.
Validation and detection
- Inventory installed WP Cerber plugin versions across WordPress environments.
- Flag any instance running version 9.4 or earlier.
- Review logs for blocked clients later accessing protected areas with changed forwarded IP values.
- Confirm security monitoring covers repeated bypass attempts against blocked IP controls.
- Document whether the site depends on WP Cerber IP blocking for business-critical protections.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-693: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2022-4100 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Protection Mechanism Failure
Protection Mechanism Failure represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.