Security readout for executives and security teams
Plain-English summary
CVE-2026-27438 is a critical WordPress theme vulnerability in ThemeREX Kingler versions up to 1.7. It could allow unauthenticated attackers to abuse unsafe PHP deserialization. For business leaders, the main concern is potential full compromise of affected WordPress sites if exploitable gadget chains exist.
Executive priority
Treat this as urgent for any internet-facing WordPress site using Kingler. Confirm exposure quickly, then follow vendor or trusted vulnerability database guidance. Do not assume compromise without evidence, but prioritize remediation because the potential impact is severe.
Technical view
The issue is CWE-502, deserialization of untrusted data, described as PHP Object Injection in the Kingler theme through version 1.7. The CVSS 3.1 score is 9.8 with network attack vector, low complexity, no privileges, and no user interaction. Public sources do not provide exploit details or a named patched version.
Likely exposure
Exposure is limited to WordPress sites running the ThemeREX Kingler theme version 1.7 or earlier. Sites not using this theme are not affected based on the provided sources.
Exploitation context
The CVE is not listed as KEV in the provided bundle, and no cited source confirms active exploitation. The risk remains high because the vulnerability is unauthenticated, network-accessible, and rated CVSS 9.8.
Researcher notes
Available public detail is sparse. The record identifies PHP Object Injection via unsafe deserialization but does not publish the vulnerable code path, exploit conditions, gadget requirements, or fixed version. Avoid over-scoping beyond ThemeREX Kingler through 1.7.
Mitigation direction
- Identify WordPress sites using the ThemeREX Kingler theme.
- Check ThemeREX and Patchstack guidance for an updated or fixed Kingler release.
- If no fix is available, consider disabling or removing the affected theme.
- Prioritize externally reachable production WordPress sites first.
Validation and detection
- Inventory installed WordPress themes across managed sites.
- Confirm whether Kingler is installed and active.
- Record the installed Kingler version on each site.
- Flag Kingler versions 1.7 or earlier as potentially affected.
- Monitor CVE and Patchstack entries 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
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-502: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. 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-2026-27438 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/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:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/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.
Deserialization of Untrusted Data
Deserialization of Untrusted Data represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.