Security readout for executives and security teams
Plain-English summary
CVE-2021-39201 lets a low-privileged authenticated WordPress user, such as a contributor or author, trigger cross-site scripting in the editor. It matters most for sites with many content accounts or untrusted contributors. WordPress patched it in 5.8 and planned backports through minor releases.
Executive priority
Treat as high priority for internet-facing WordPress sites with multiple content users. The risk is not unauthenticated takeover, but it can let a lower-privileged account bypass HTML safety controls and affect other users through the editor. Patch through normal WordPress update channels promptly.
Technical view
This is a CWE-79 XSS issue in WordPress versions 5.0 to before 5.8.0. It bypasses restrictions for users lacking the unfiltered_html capability, allowing authenticated low-privileged users to execute XSS in the editor. CVSS 3.1 is 7.6 with low complexity, low privileges required, user interaction required, and changed scope.
Likely exposure
Exposure is likely on WordPress sites running core versions 5.0 through before 5.8.0, especially where contributor or author accounts are available to contractors, community users, or other less-trusted users. Debian-packaged WordPress environments should also check DSA-4985.
Exploitation context
The supplied sources do not state active exploitation, and the CVE is not marked in KEV. Public vulnerability details exist through HackerOne and the GitHub advisory. Exploitation requires authenticated low-privileged editor access and user interaction, so account governance affects practical risk.
Researcher notes
Evidence identifies WordPress core, versions 5.0 to before 5.8.0, with CVSS 7.6 and CWE-79. The key security boundary is unfiltered_html enforcement for low-privileged users. The bundle does not provide verified in-the-wild exploitation or detailed exploit mechanics, so validation should focus on version and role exposure.
Mitigation direction
- Upgrade WordPress to 5.8 or later, or apply vendor backported minor releases.
- Keep WordPress automatic updates enabled to receive the fix.
- Review Debian DSA-4985 guidance for Debian-packaged WordPress systems.
- Restrict contributor and author access to trusted users until patched.
- Monitor WordPress release advisories for environment-specific update guidance.
Validation and detection
- Inventory WordPress core versions and flag 5.0 through before 5.8.0.
- Confirm WordPress 5.8 or a patched minor release is deployed.
- Verify automatic core updates are enabled where operationally permitted.
- Review contributor and author accounts with editor access.
- Check Debian package status against DSA-4985 where applicable.
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 lookupDatabase behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-39201 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
- High
- CVSS
- 7.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/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:R/S:C/C:H/I:L/A:N2.34.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.6HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://hackerone.com/reports/1142140CVE reference · x_refsource_MISC
- https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-wh69-25hr-h94vCVE reference · x_refsource_CONFIRM
- DSA-4985CVE reference · vendor-advisory, x_refsource_DEBIAN
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.