Security readout for executives and security teams
Plain-English summary
This is a low-severity stored XSS issue in a WordPress GDPR/cookie plugin. An already-authenticated, highly privileged user would need to place malicious script content, and another user interaction is required. Business urgency is lower than unauthenticated or remote takeover bugs, but affected public WordPress sites should still remediate because stored script can alter page behavior or admin trust.
Executive priority
Treat this as a routine but real WordPress hygiene item. It does not justify emergency response based on the supplied evidence, but affected sites should be fixed during the next maintenance window, sooner if admin accounts are shared or weakly controlled.
Technical view
CVE-2021-36889 covers multiple stored authenticated XSS vulnerabilities in the Tarteaucitron tarteaucitron.js Cookies legislation & GDPR WordPress plugin versions 1.6 and earlier. The CVSS vector shows network access, low attack complexity, high privileges required, required user interaction, changed scope, low integrity impact, and no confidentiality or availability impact.
Likely exposure
Exposure is limited to WordPress installations using the tarteaucitronjs plugin at version 1.6 or earlier. Sites without this plugin, or with versions confirmed outside the affected range, are not indicated as affected by the provided sources.
Exploitation context
The provided bundle does not show CISA KEV listing or active exploitation evidence. The vulnerability requires authenticated high privileges and user interaction, reducing broad internet-scale risk. It remains relevant for compromised admin accounts, shared administration environments, or weakly governed WordPress operations.
Researcher notes
Evidence is concise: affected product, version range, CWE-79, and CVSS details are available, but the supplied bundle does not include exploit status, affected parameters, proof details, or a named fixed version. Avoid assuming exploitability beyond authenticated stored XSS requiring high privileges and user interaction.
Mitigation direction
- Inventory WordPress sites for the tarteaucitronjs plugin and its installed version.
- Prioritize remediation for installations running version 1.6 or earlier.
- Check WordPress.org and Patchstack guidance for fixed-version or vendor mitigation details.
- Remove or disable the plugin where it is not business-required.
- Limit plugin administration access to trusted users only.
- Review suspicious plugin settings or content changes on affected sites.
Validation and detection
- Confirm whether tarteaucitronjs is installed on each WordPress property.
- Record the installed plugin version and compare it with the affected range.
- Check whether untrusted users have high-privilege WordPress access.
- Review admin audit logs for unexpected plugin configuration changes.
- Perform safe authenticated XSS validation only in a controlled staging environment.
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-2021-36889 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
- Low
- CVSS
- 3.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:N/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:H/UI:R/S:C/C:N/I:L/A:N1.71.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.4LowVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://wordpress.org/plugins/tarteaucitronjs/#developersCVE reference · x_refsource_CONFIRM
- https://patchstack.com/database/vulnerability/tarteaucitronjs/wordpress-tarteaucitron-js-cookies-legislation-gdpr-plugin-1-6-multiple-stored-authenticated-cross-site-scripting-xss-vulnerabilitiesCVE 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.