Security readout for executives and security teams
Plain-English summary
CVE-2026-27986 affects the WordPress OsTende theme by ThemeREX through version 1.4.3. A remote unauthenticated attacker may be able to make the site include unintended local PHP files. The CVSS score is 8.1, rated high. There is no provided evidence of active exploitation or CISA KEV listing.
Executive priority
Prioritize identification and remediation for internet-facing WordPress sites using OsTende. The issue has high potential impact, but current sources do not show known exploitation. Act promptly, especially where the theme supports public-facing business services.
Technical view
The issue is described as improper filename control in a PHP include/require statement, categorized as CWE-98. The CVE states it allows PHP Local File Inclusion in OsTende through 1.4.3. The vector is network reachable, no privileges, no user interaction, high complexity, with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to WordPress sites using the ThemeREX OsTende theme at version 1.4.3 or earlier. The source bundle does not identify other affected products or confirm whether inactive installed copies are exploitable.
Exploitation context
No active exploitation is supported by the provided sources, and the CVE is not marked KEV. The vulnerability is remotely reachable without authentication, but rated high attack complexity, suggesting exploitation may require specific conditions not detailed in the sources.
Researcher notes
Evidence is limited to the CVE record and Patchstack database reference. The bundle does not provide exploit details, fixed version, affected code paths, or vendor advisory text. Avoid assuming exploitation in the wild or specific remediation beyond checking official guidance.
Mitigation direction
- Inventory WordPress sites for the OsTende theme and installed version.
- Treat OsTende versions 1.4.3 and earlier as affected.
- Check ThemeREX and Patchstack guidance for an update or vendor mitigation.
- Remove the theme if it is unnecessary and business-approved.
- Apply compensating monitoring until vendor remediation is confirmed.
Validation and detection
- Confirm whether OsTende is installed on each WordPress site.
- Record the exact theme version and compare with 1.4.3 or earlier.
- Review vendor or Patchstack advisories for fixed-version information.
- Check logs for unusual requests to theme PHP endpoints.
- Verify remediation status after any update, removal, or vendor-recommended change.
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-2026-27986 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.