Security readout for executives and security teams
Plain-English summary
CVE-2026-4278 affects the Simple Download Counter WordPress plugin up to version 2.3. A logged-in user with Contributor-level access or higher could save malicious script through a shortcode attribute. That script could run when others view the affected page, risking session theft, content tampering, or misleading site visitors.
Executive priority
Treat as a normal-priority web application remediation unless the site allows many contributors or handles sensitive user sessions. The business risk is reputational and account-impacting rather than infrastructure-wide. Prioritize public-facing WordPress sites and sites where non-admin users can submit content.
Technical view
The issue is stored cross-site scripting in the sdc_menu shortcode. The CVE description cites insufficient sanitization and escaping of user-controlled shortcode attributes, specifically text and cat. The text value is output into HTML content, while cat is used in class attributes without proper escaping. CVSS 3.1 is 6.4, requiring low privileges.
Likely exposure
Exposure is limited to WordPress sites using Simple Download Counter versions up to and including 2.3, where untrusted or semi-trusted users can create or edit content with shortcodes. Sites with only trusted administrators and no Contributor-level accounts have lower practical risk, but should still verify plugin status.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires an authenticated account with Contributor privileges or higher, but does not require user interaction beyond a victim viewing the injected page. Stored XSS can affect administrators if they view compromised content.
Researcher notes
Source evidence identifies CWE-79 stored XSS in shortcode attribute handling and references affected code lines plus a WordPress Trac changeset. The bundle does not clearly state a fixed version. Avoid assuming remediation beyond checking vendor guidance and reviewing the referenced changeset.
Mitigation direction
- Check whether Simple Download Counter is installed and its version.
- Review vendor or WordPress plugin guidance for an updated fixed release.
- Restrict Contributor-level access to trusted users until remediated.
- Audit existing posts and pages using the sdc_menu shortcode.
- Apply least privilege and remove unused WordPress accounts.
Validation and detection
- Inventory WordPress sites for the Simple Download Counter plugin.
- Confirm whether installed versions are 2.3 or earlier.
- Review pages and posts containing sdc_menu shortcodes.
- Check for unexpected script-like content in shortcode attributes.
- Monitor Wordfence and WordPress plugin records for fix 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-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-2026-4278 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
- Medium
- CVSS
- 6.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/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:L/PR:L/UI:N/S:C/C:L/I:L/A:N3.12.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/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/f23dec73-9031-4829-a84b-4979c8e8ded4?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/simple-download-counter/trunk/inc/functions-shortcode.php#L159CVE reference
- https://plugins.trac.wordpress.org/browser/simple-download-counter/tags/2.3/inc/functions-shortcode.php#L159CVE reference
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3487364%40simple-download-counter&new=3487364%40simple-download-counter&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.