Security readout for executives and security teams
Plain-English summary
CVE-2026-1304 affects the Restrict Content WordPress membership plugin. An already-authenticated administrator could save malicious script in invoice settings, causing it to run when affected invoice pages are viewed. Because administrator access is required, this is not a broad remote takeover issue, but it can still create business risk on compromised or shared-admin WordPress sites.
Executive priority
Handle in normal vulnerability remediation cycles unless the site has exposed admin access concerns or suspected account compromise. Prioritize faster remediation for revenue, membership, or customer-facing sites using invoices.
Technical view
Stored XSS exists in multiple invoice settings fields in Restrict Content versions up to and including 3.2.18. The issue is attributed to insufficient input sanitization and output escaping. CVSS is 4.4, with high privileges required, high attack complexity, scope changed, and low confidentiality and integrity impact.
Likely exposure
Exposure is limited to WordPress sites running Membership Plugin – Restrict Content version 3.2.18 or earlier. Practical risk is highest where many administrators exist, admin accounts are shared, or an administrator account is compromised.
Exploitation context
The source bundle does not show CISA KEV listing or cited active exploitation. Exploitation requires administrator-level access or higher, then persistence through invoice settings. This should be treated as a post-compromise or insider-risk issue rather than unauthenticated internet exploitation.
Researcher notes
Code references point to invoice settings and invoice template output in the WordPress plugin repository. The provided data identifies affected versions through 3.2.18 but does not provide a clearly named fixed version in the bundle. Avoid assuming exploitation in the wild without additional evidence.
Mitigation direction
- Inventory WordPress sites for Restrict Content plugin version 3.2.18 or earlier.
- Check vendor or WordPress.org guidance for the fixed release before upgrading.
- Upgrade to a non-affected release when available and tested.
- Restrict WordPress administrator access to trusted, named accounts only.
- Remove stale administrator accounts and enforce multifactor authentication.
- Review invoice settings for unexpected script-like content.
Validation and detection
- Confirm installed Restrict Content version on each WordPress site.
- Review invoice settings fields for unauthorized HTML or script content.
- Check recent administrator account activity for suspicious changes.
- Verify invoice pages render safely after remediation.
- Monitor CVE, Wordfence, and plugin release notes for updated guidance.
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
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CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2026-1304 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
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:H/UI:N/S:C/C:L/I:L/A:N1.32.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.4MediumVector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/cdd563b7-a1b9-4d99-9a6e-c8acf9dda619?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/restrict-content/tags/3.2.16/core/includes/admin/settings/settings.php#L896CVE reference
- https://plugins.trac.wordpress.org/browser/restrict-content/tags/3.2.16/core/templates/invoice.php#L271CVE reference
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3448964%40restrict-content&new=3448964%40restrict-content&sfp_email=&sfph_mail=CVE reference
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 Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.