Security readout for executives and security teams
Plain-English summary
This is a reflected cross-site scripting flaw in the Media Usage WordPress plugin through the id parameter. An attacker could trick a user into opening a crafted link, causing script to run in that user’s browser. The sources rate it medium severity and require user interaction.
Executive priority
Treat this as a moderate web application risk. It is not listed as actively exploited in the supplied data, but WordPress XSS can support credential theft or session misuse if a user is deceived. Prioritize internet-facing WordPress sites using this plugin.
Technical view
CVE-2021-34652 is CWE-79 in Media Usage up to and including 0.0.4. The vulnerable input is the id parameter in mmu_admin.php. CVSS 3.1 is 6.1: network reachable, low complexity, no privileges, user interaction required, changed scope, low confidentiality and integrity impact.
Likely exposure
Exposure is limited to WordPress sites running the Media Usage plugin at version 0.0.4 or older. The bundle does not identify other affected products or versions. Sites without this plugin are not indicated as affected.
Exploitation context
The bundle does not show active exploitation, and KEV status is false. Practical exploitation would require a user to interact with attacker-controlled content or a crafted link. The available evidence supports reflected browser-side impact, not server takeover or availability loss.
Researcher notes
The source bundle identifies the vulnerable file and parameter but does not include a named patch version, exploit evidence, or maintainer remediation details. Avoid assuming broader plugin family exposure. Validate against installed plugin versions and current WordPress plugin repository status.
Mitigation direction
- Inventory WordPress sites for the Media Usage plugin and installed version.
- Check Wordfence, WordPress plugin, and vendor guidance for fixed or supported versions.
- Disable or remove the plugin where it is unnecessary or unsupported.
- Limit administrative browsing from logged-in WordPress sessions where feasible.
- Monitor for unexpected requests to the vulnerable plugin file.
Validation and detection
- Confirm whether Media Usage is installed on each WordPress site.
- Record plugin versions and flag 0.0.4 or older for review.
- Review web logs for requests targeting mmu_admin.php with unusual id values.
- Verify remediation against current vendor or WordPress plugin guidance.
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-2021-34652 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-2021-34652CVE reference · x_refsource_MISC
- https://plugins.trac.wordpress.org/browser/media-usage/trunk/mmu_admin.php#L91CVE 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.