Security readout for executives and security teams
Plain-English summary
CVE-2026-28027 is a high-severity vulnerability in the WordPress Kayon theme from ThemeREX, affecting versions up to 1.3. A vulnerable site may allow an unauthenticated remote attacker to include local files through unsafe PHP include handling. Organizations not using this theme are not indicated as exposed.
Executive priority
High priority only for organizations using the Kayon WordPress theme. Confirm exposure promptly, then follow vendor or Patchstack remediation guidance. If Kayon is not present, this CVE does not create indicated business urgency.
Technical view
The issue is CWE-98: improper control of filenames used in PHP include/require statements. The CVSS 3.1 score is 8.1 with network access, no privileges, no user interaction, high attack complexity, and high confidentiality, integrity, and availability impact. The CVE description characterizes the result as PHP Local File Inclusion.
Likely exposure
Likely exposure is limited to WordPress sites with the ThemeREX Kayon theme installed, especially internet-facing sites running Kayon version 1.3 or earlier. The provided data does not identify other affected products or platforms.
Exploitation context
The source bundle does not show CISA KEV listing or cite active exploitation. CVSS indicates unauthenticated network exploitation is possible but high complexity. No exploit availability is established by the provided sources.
Researcher notes
Evidence is limited to CVE metadata and the Patchstack database reference. The narrative states Kayon through version 1.3 is affected, while structured affected data is sparse. No patch version, exploit status, or workaround is provided in the bundle.
Mitigation direction
- Inventory WordPress sites for the Kayon theme and installed version.
- Prioritize sites running Kayon version 1.3 or earlier.
- Check ThemeREX and Patchstack guidance for an official fix or mitigation.
- Remove or replace Kayon where it is unused or not business-critical.
- Increase monitoring for suspicious WordPress file access until resolved.
Validation and detection
- Confirm whether Kayon is installed on each WordPress site.
- Record the exact Kayon version for exposed sites.
- Compare findings against the CVE and Patchstack affected-version statement.
- Review web logs for unusual file-include or path-related errors.
- Document sites where Kayon is absent to close exposure.
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-98: 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-2026-28027 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
- High
- CVSS
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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:H/PR:N/UI:N/S:U/C:H/I:H/A:H2.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion')
Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.