Security readout for executives and security teams
Plain-English summary
This affects WordPress sites using Quiz And Survey Master version 7.3.4 or older. A logged-in contributor-level user or higher could store malicious script content that later runs in another user's browser. The issue is moderate because it requires an authenticated role and user interaction, but it can still affect site trust and user sessions.
Executive priority
Treat this as a moderate web-platform risk. Prioritize remediation on public WordPress sites, customer-facing sites, and sites with many content contributors. It is not KEV-listed in the provided sources.
Technical view
CVE-2021-36905 is multiple authenticated stored XSS in ExpressTech Quiz And Survey Master for WordPress through 7.3.4. The CVSS 3.1 score is 5.4 with low attack complexity, low privileges required, user interaction required, changed scope, and low confidentiality and integrity impact. The listed weakness is CWE-79.
Likely exposure
Exposure is limited to WordPress installations running Quiz And Survey Master version 7.3.4 or earlier, especially where contributor-level users can create or edit quiz or survey content.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. Exploitation requires an authenticated contributor-or-higher account and a victim user viewing affected stored content.
Researcher notes
Evidence is sufficient for affected product, version range, weakness class, and CVSS characteristics. The provided bundle does not include exploit details, proof of active exploitation, or a named fixed version, so remediation should be confirmed against vendor guidance.
Mitigation direction
- Inventory WordPress sites for Quiz And Survey Master installations.
- Identify and prioritize versions 7.3.4 or earlier.
- Check vendor plugin guidance for the fixed release and update accordingly.
- Restrict contributor-or-higher access to trusted users only.
- Review recently changed quiz and survey content for unexpected script-like content.
Validation and detection
- Confirm whether the plugin slug quiz-master-next is installed.
- Record the installed plugin version on each WordPress site.
- Review WordPress roles with contributor or higher permissions.
- Check plugin developer notes and Patchstack entry for remediation status.
- Verify affected sites no longer run version 7.3.4 or earlier.
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-2021-36905 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
- 5.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/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:L/UI:R/S:C/C:L/I:L/A:N2.32.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source materials
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.