Security readout for executives and security teams
Plain-English summary
CVE-2026-27991 affects the ThemeREX Avventure WordPress theme through version 1.1.12. It can allow local file inclusion, potentially exposing sensitive files or enabling deeper compromise. The available sources rate it high severity, but do not show known active exploitation or a named fixed version.
Executive priority
Prioritize identification and containment on internet-facing WordPress sites. Treat affected installations as high risk because the reported impact includes confidentiality, integrity, and availability. Urgency is elevated, but current evidence does not confirm exploitation in the wild.
Technical view
The issue is CWE-98: improper control of a filename used in a PHP include/require statement. The CVSS 3.1 score is 8.1, with network attack vector, no privileges, no user interaction, high attack complexity, and high confidentiality, integrity, and availability impact.
Likely exposure
Public WordPress sites using the ThemeREX Avventure theme version 1.1.12 or earlier are the likely exposure. Sites not using this theme are not indicated as affected by the provided sources.
Exploitation context
The CVE data indicates remote network reachability and no required authentication or user interaction, but high attack complexity. CISA KEV is false in the provided bundle, and no cited source confirms active exploitation.
Researcher notes
Evidence is limited to CVE and Patchstack metadata in the provided bundle. No exploit details, patch version, or workaround are included. The description says Avventure through 1.1.12 is affected, despite sparse affected-product version metadata.
Mitigation direction
- Identify all WordPress sites using the Avventure theme.
- Check installed Avventure theme versions against 1.1.12 or earlier.
- Review ThemeREX and Patchstack guidance for an official fix or workaround.
- Restrict or remove the theme if no safe vendor guidance is available.
- Increase monitoring for suspicious file access on affected sites.
Validation and detection
- Inventory WordPress themes across production and staging sites.
- Confirm whether Avventure is installed, active, or present but inactive.
- Record the exact Avventure theme version from WordPress administration or asset inventory.
- Check web logs for unusual requests targeting theme PHP files.
- Reassess after vendor guidance or updated Patchstack information is published.
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-2026-27991 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.