Security readout for executives and security teams
Plain-English summary
A vulnerable WordPress plugin can let an attacker trick a logged-in site administrator into saving malicious script into the site. That script could then run for visitors or administrators, creating risk to site integrity, user data, and administrative sessions.
Executive priority
Treat as high priority only where the plugin is present. The business risk is website compromise through administrator deception, not a universal WordPress platform flaw.
Technical view
CVE-2021-34633 affects the Youtube Feeder WordPress plugin through version 2.0.1. The source describes CSRF in printAdminPage in youtube-feeder.php that permits stored cross-site scripting. CVSS 3.1 is 8.8 high. The provided bundle lists CWE-352 and does not identify a fixed version.
Likely exposure
Exposure is limited to WordPress sites with Youtube Feeder installed at version 2.0.1 or earlier. Risk is highest where the plugin is active on internet-facing sites and administrators use the WordPress dashboard regularly.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation evidence. Exploitation depends on user interaction, consistent with CSRF, likely involving a logged-in WordPress administrator. The provided sources do not specify role requirements or observed attacks.
Researcher notes
Evidence points to CSRF in printAdminPage allowing stored XSS. The bundle cites plugin source and Wordfence, but does not provide a fixed version, patch diff, exploit telemetry, or detailed preconditions. Avoid assuming active exploitation.
Mitigation direction
- Inventory WordPress sites for Youtube Feeder version 2.0.1 or earlier.
- Disable or remove the plugin if it is not required.
- Check vendor or WordPress plugin guidance for a maintained fixed release.
- Review plugin settings and site content for unexpected scripts.
- Restrict administrator browsing and dashboard access until remediated.
Validation and detection
- Confirm whether Youtube Feeder is installed and active on each WordPress site.
- Record installed plugin version and compare against affected versions through 2.0.1.
- Review WordPress admin audit logs for unexpected plugin configuration changes.
- Inspect rendered pages and plugin output for unauthorized script content.
- If maintaining a fork, verify CSRF nonce and authorization checks around admin updates.
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-352: 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-2021-34633 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
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://plugins.trac.wordpress.org/browser/youtube-feeder/trunk/youtube-feeder.php#L669CVE reference · x_refsource_MISC
- https://www.wordfence.com/vulnerability-advisories/#CVE-2021-34633CVE 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.
Cross-Site Request Forgery (CSRF)
Cross-Site Request Forgery (CSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.