Security readout for executives and security teams
Plain-English summary
CVE-2021-34665 is a reflected cross-site scripting issue in the WP SEO Tags WordPress plugin up to version 2.2.7. An attacker could trick a user into opening a crafted request that runs script in the user’s browser. Business impact is usually account abuse, content tampering, or data exposure through the victim’s session.
Executive priority
Treat this as a moderate-priority web application issue. It is not documented as actively exploited in the provided sources, but affected public WordPress sites should be remediated because successful phishing could compromise privileged browser sessions or site content workflows.
Technical view
The vulnerability is CWE-79 reflected XSS through the saq_txt_the_filter parameter in wp-seo-tags.php. CVSS 3.1 is 6.1: network reachable, low complexity, no privileges required, user interaction required, changed scope, low confidentiality and integrity impact, no availability impact.
Likely exposure
Exposure is limited to WordPress sites that have WP SEO Tags installed at version 2.2.7 or earlier. Internet-facing sites are the main concern because unauthenticated attackers can deliver crafted links externally, but exploitation still depends on user interaction.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The CVSS vector indicates exploitation requires user interaction, typically convincing a victim to visit a malicious or crafted URL. No exploit code or weaponized public details are included in the supplied bundle.
Researcher notes
Evidence identifies the vulnerable parameter and file, affected plugin, CWE-79 class, and CVSS vector. The bundle does not provide a confirmed fixed version, exploit status, or vendor mitigation beyond the vulnerability advisory references, so remediation should be verified against current vendor guidance.
Mitigation direction
- Inventory WordPress sites for WP SEO Tags and record installed versions.
- Check vendor or WordPress plugin guidance for a fixed release or official remediation.
- Upgrade if a fixed version is available from the vendor.
- Disable or remove WP SEO Tags if no supported fix is available.
- Prioritize administrator-facing sites or sites with privileged editorial users.
Validation and detection
- Confirm whether WP SEO Tags is installed on each WordPress site.
- Verify the installed version is above 2.2.7 or otherwise remediated.
- Review web logs for suspicious saq_txt_the_filter requests.
- Use non-destructive XSS testing to confirm output encoding behavior.
- Document any site where the plugin remains enabled without a vendor-supported fix.
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-2021-34665 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
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/vulnerability-advisories/#CVE-2021-34665CVE reference · x_refsource_MISC
- https://plugins.trac.wordpress.org/browser/wp-seo-tags/trunk/wp-seo-tags.php#L378CVE 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.
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.