Security readout for executives and security teams
Plain-English summary
CVE-2021-36901 affects Phil Baker's Age Gate WordPress plugin version 2.17.0 and earlier. It is an unauthenticated stored XSS issue, meaning attacker-controlled script could be saved and later run in another user's browser. Sources do not show confirmed active exploitation or server compromise.
Executive priority
Handle during normal vulnerability remediation cycles, faster for public WordPress sites with untrusted traffic. The main risk is browser-side compromise or content abuse, not proven infrastructure takeover.
Technical view
The issue is CWE-79 stored cross-site scripting in Age Gate for WordPress <= 2.17.0. CVSS 3.1 is 6.1: network reachable, low complexity, no privileges, user interaction required, changed scope, low confidentiality and integrity impact, no availability impact.
Likely exposure
Exposure is likely limited to WordPress sites that installed the Age Gate plugin and have not moved beyond version 2.17.0. Sites without this plugin are not indicated as affected by the provided sources.
Exploitation context
The bundle does not include exploit details, public proof-of-concept status, or CISA KEV listing. Treat exploitation as plausible for exposed outdated plugins, but do not label it actively exploited from these sources.
Researcher notes
The source bundle identifies the vulnerability class and affected range but not the exact vulnerable parameter, exploit path, or patch version. Validation should stay defensive and focus on plugin presence, version, logs, and stored content review.
Mitigation direction
- Inventory WordPress sites for the Age Gate plugin and installed version.
- If Age Gate is <= 2.17.0, check vendor guidance for a fixed release.
- Update, disable, or remove the plugin if no supported fixed version is available.
- Review WordPress users and content for unexpected administrator or editor changes.
Validation and detection
- Confirm whether Age Gate is installed on each WordPress site.
- Record the installed plugin version and compare it with the affected range.
- Review web application logs for suspicious unauthenticated Age Gate-related submissions.
- Check pages using Age Gate for unexpected stored script or markup.
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-2021-36901 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://wordpress.org/plugins/age-gate/#developersCVE reference · x_refsource_CONFIRM
- https://patchstack.com/database/vulnerability/age-gate/wordpress-age-gate-plugin-2-17-0-unauthenticated-stored-cross-site-scripting-xss-vulnerabilityCVE reference · x_refsource_CONFIRM
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.