Security readout for executives and security teams
Plain-English summary
CVE-2026-1809 affects the HTML Tag Shortcodes WordPress plugin through version 1.1. A logged-in user with Contributor-level access or higher can save shortcode content that runs script in other users’ browsers when they view the affected page. This is a moderate business risk, especially on sites with many content authors.
Executive priority
Treat as a moderate-priority web content integrity issue. Prioritize public WordPress sites with many authors, external contributors, or weak account controls. If no fixed version is available, reduce exposure by disabling the plugin or limiting author permissions.
Technical view
The issue is stored cross-site scripting in shortcode attributes caused by insufficient input sanitization and output escaping. Wordfence rates it CVSS 6.4. The CVE states authenticated Contributor+ users can inject arbitrary web scripts that execute when an injected page is accessed. Public sources do not identify a fixed version.
Likely exposure
Exposure is limited to WordPress sites running HTML Tag Shortcodes / HTML Shortcodes up to and including version 1.1, especially where Contributor or higher accounts are broadly assigned or compromised.
Exploitation context
No active exploitation is indicated by KEV, and the provided sources do not claim exploitation in the wild. Abuse requires authenticated content access at Contributor level or higher, then victim viewing of the stored content.
Researcher notes
The cited WordPress Trac locations identify shortcode handling areas, including version 1.1 and trunk references. The source bundle describes missing sanitization and escaping but does not provide an official patch identifier or fixed version. Avoid assuming remediation beyond vendor guidance.
Mitigation direction
- Check vendor and WordPress plugin guidance for a fixed release or official remediation.
- Update the plugin if a fixed version is available from the vendor.
- Disable or remove the plugin if it is not required.
- Restrict Contributor and higher roles to trusted users only.
- Review existing content using plugin shortcodes for suspicious attributes.
Validation and detection
- Inventory WordPress sites for the HTML Tag Shortcodes plugin.
- Confirm installed plugin versions, prioritizing versions up to and including 1.1.
- Review user roles for Contributor or higher access.
- Inspect pages or posts using this plugin’s shortcodes.
- Monitor Wordfence, CVE, and plugin repository updates for remediation status.
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-2026-1809 mapping review
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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/846ccac2-ad56-4128-836d-2807c700c3fc?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/html-shortcodes/tags/1.1/html_shortcode.php#L88CVE reference
- https://plugins.trac.wordpress.org/browser/html-shortcodes/trunk/html_shortcode.php#L88CVE 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.