Security readout for executives and security teams
Plain-English summary
This vulnerability affects the WordPress Backup Migration plugin through version 1.1.5. A highly privileged logged-in user could store malicious script content that later runs in another user’s browser. Business impact is usually limited, but exposed admin panels or shared administration teams raise risk.
Executive priority
Treat as a normal-priority web application hygiene item. Patch or remove affected plugin installations during the next maintenance cycle, sooner if many administrators or third parties can access WordPress.
Technical view
CVE-2021-36884 is an authenticated persistent XSS issue in Backupbliss Backup Migration for WordPress, affecting versions <= 1.1.5. CVSS 3.1 is 4.8 with high privileges required, user interaction required, changed scope, and low confidentiality and integrity impact. It maps to CWE-79.
Likely exposure
Exposure is limited to WordPress sites with the Backup Migration plugin installed at version 1.1.5 or earlier. Risk depends on who has authenticated high-privilege access to WordPress administration.
Exploitation context
The source bundle does not show active exploitation, and KEV is false. Exploitation requires authenticated high privileges and user interaction, so this is less urgent than unauthenticated WordPress compromise but still relevant for admin-trust boundaries.
Researcher notes
Evidence is concise: affected product and version range are identified, but the bundle does not include vulnerable parameters, proof-of-concept detail, or a named fixed version. Avoid assuming broader Backupbliss products are affected.
Mitigation direction
- Inventory WordPress sites using the Backup Migration plugin.
- Confirm whether installed versions are 1.1.5 or earlier.
- Follow Backupbliss or WordPress plugin guidance for updates.
- Disable or remove the plugin where it is unnecessary.
- Limit high-privilege WordPress accounts to trusted users only.
Validation and detection
- Check plugin inventory for backup-backup or Backup Migration.
- Record installed plugin versions across WordPress environments.
- Review WordPress admin users with high privileges.
- Inspect recent plugin settings or content changes for suspicious scripts.
- Confirm remediation against vendor release information.
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-2021-36884 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
- 4.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/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:H/UI:R/S:C/C:L/I:L/A:N1.72.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.8MediumVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://wordpress.org/plugins/backup-backup/#developersCVE reference · x_refsource_CONFIRM
- https://patchstack.com/database/vulnerability/backup-backup/wordpress-backup-migration-plugin-1-1-5-authenticated-persistent-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.