Security readout for executives and security teams
Plain-English summary
CVE-2019-13478 is a Yoast SEO for WordPress flaw where versions before 11.6-RC5 did not properly restrict unfiltered HTML in term descriptions. That can turn content fields into a security boundary failure, with high confidentiality and integrity impact according to the CVSS record.
Executive priority
Treat this as a high-priority WordPress plugin hygiene issue for affected sites. It is critical by CVSS, but the provided evidence does not prove active exploitation. Prioritize internet-facing or multi-author WordPress properties first.
Technical view
The CVE describes improper restriction of unfiltered HTML in WordPress term descriptions. The CVSS 3.0 vector is network reachable, low complexity, low privileges required, no user interaction, changed scope, with high confidentiality and integrity impact and low availability impact.
Likely exposure
Exposure is likely limited to WordPress sites running Yoast SEO versions before 11.6-RC5, especially where authenticated users can create or edit term descriptions. The source bundle does not identify exact WordPress roles, configurations, or CPEs.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Risk is still material because the CVSS record rates exploitation as low complexity with low privileges and no user interaction.
Researcher notes
The public bundle is sparse: no CWE, no CPEs, and no exact role prerequisites are provided. The key technical fact is improper restriction of unfiltered HTML in term descriptions before Yoast SEO 11.6-RC5; validate exposure against real plugin versions and permissions.
Mitigation direction
- Inventory WordPress sites using Yoast SEO and record installed versions.
- Upgrade vulnerable Yoast SEO installations off versions before 11.6-RC5.
- Check Yoast guidance for the currently supported fixed release.
- Restrict term description editing to trusted administrative users.
- Review recent taxonomy or term description changes for unexpected HTML.
Validation and detection
- Confirm Yoast SEO version is 11.6-RC5 or later, or vendor-confirmed fixed.
- Identify users or roles allowed to edit WordPress term descriptions.
- Review term descriptions for unexpected scripts, markup, or embedded content.
- Check vulnerability scanner findings against CVE-2019-13478.
- Document any compensating access controls around content editing.
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.
CVE-2019-13478 mapping review
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Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.9 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AC:L/AV:N/A:L/C:H/I:H/PR:L/S:C/UI: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:3.0/AC:L/AV:N/A:L/C:H/I:H/PR:L/S:C/UI:N3.16Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
9.9CriticalVector: CVSS:3.0/AC:L/AV:N/A:L/C:H/I:H/PR:L/S:C/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/Yoast/wordpress-seo/releases/tag/11.6-RC5CVE reference · x_refsource_MISC
- https://wpvulndb.com/vulnerabilities/9445CVE reference · x_refsource_MISC
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.