Security readout for executives and security teams
Plain-English summary
This flaw affects the YouTube Video Inserter WordPress plugin through version 1.2.1.0. A malicious link could cause script to run in a visitor's browser in the context of the affected site. The source bundle does not show active exploitation or a named fixed version.
Executive priority
Treat this as a moderate web risk. It is not known exploited from the supplied sources, but affected public WordPress sites should be found and remediated because XSS can support account abuse, phishing, and content tampering.
Technical view
CVE-2021-38327 is reflected cross-site scripting in ~/adminUI/settings.php. The vulnerable code reflects $_SERVER["PHP_SELF"], allowing arbitrary web script injection. CVSS 3.1 is 6.1, with network access, low complexity, no privileges, and required user interaction.
Likely exposure
Exposure is limited to WordPress sites running the YouTube Video Inserter plugin at version 1.2.1.0 or earlier. Sites without this plugin are not indicated as affected by the provided sources.
Exploitation context
The CVE is not listed as KEV, and the provided sources do not claim active exploitation. Exploitation requires user interaction, typically causing a target to load attacker-controlled input that is reflected by the vulnerable plugin page.
Researcher notes
The source evidence identifies CWE-79 and the vulnerable sink as reflected PHP_SELF in adminUI/settings.php. The bundle does not provide a fixed version, patch diff, exploit telemetry, or evidence beyond the affected plugin version boundary.
Mitigation direction
- Inventory WordPress sites for YouTube Video Inserter version 1.2.1.0 or earlier.
- Check WordPress plugin or vendor guidance for a maintained fixed release.
- Update the plugin if a fixed version is available from a trusted source.
- Disable or remove the plugin if no supported fix is available.
- Review compensating controls for suspicious reflected-XSS attempts against affected paths.
Validation and detection
- Confirm whether the plugin is installed and enabled on each WordPress site.
- Record the installed plugin version and compare it to 1.2.1.0 or earlier.
- Review adminUI/settings.php for unsafe reflection of PHP_SELF.
- Have an authorized tester validate reflection safely in staging, without executing script payloads.
- Check web logs for unusual requests targeting the plugin settings path.
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-2021-38327 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-2021-38327CVE reference · x_refsource_MISC
- https://plugins.trac.wordpress.org/browser/youtube-video-inserter/trunk/adminUI/settings.php#L67CVE 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.