Security readout for executives and security teams
Plain-English summary
CVE-2026-28055 is a high-severity file inclusion flaw in the ThemeREX M.Williamson WordPress theme through version 1.2.11. If exploitable, it could let an unauthenticated remote attacker access or manipulate server-side files, with potential confidentiality, integrity, and availability impact. Public sources do not state active exploitation.
Executive priority
Prioritize affected public WordPress sites this week. The issue is high severity with potential full impact across data confidentiality, integrity, and availability, but current public sources do not confirm active exploitation or a specific patch.
Technical view
The CVE describes improper control of a filename used in a PHP include/require statement, classified as CWE-98. The affected product is the ThemeREX M.Williamson WordPress theme, package williamson, through version 1.2.11. CVSS 3.1 is 8.1 with network attack vector, no privileges, no user interaction, and high complexity.
Likely exposure
Exposure is limited to WordPress sites running the ThemeREX M.Williamson theme at version 1.2.11 or earlier. Sites not using this theme are not indicated as affected by the provided sources.
Exploitation context
The CVSS vector indicates remote, unauthenticated exploitation is possible but high complexity. The source bundle does not identify public exploit code, observed attacks, or CISA KEV listing. Treat internet-facing WordPress deployments using this theme as higher priority until vendor guidance is confirmed.
Researcher notes
Evidence is sparse. The CVE and Patchstack entry identify LFI/RFI-style filename control in PHP include/require handling, but do not provide vulnerable parameters, exploit conditions, proof of concept, or remediation details in the supplied bundle.
Mitigation direction
- Inventory WordPress sites for the M.Williamson theme and version.
- Check ThemeREX and Patchstack for a fixed version or official workaround.
- If business allows, disable or remove the theme pending vendor guidance.
- Apply any vendor-provided update after testing backups and site compatibility.
Validation and detection
- Confirm whether the active or installed theme is M.Williamson.
- Record the installed theme version and compare with 1.2.11 or earlier.
- Review web and PHP logs for abnormal file access errors.
- Monitor Patchstack and CVE records for updated remediation details.
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
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ATT&CK lookup starting points
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CWE-98: Exact CWE lookup
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Open ATT&CK lookupCVE-2026-28055 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.