Security readout for executives and security teams
Plain-English summary
This is a stored cross-site scripting issue in the MasterStudy LMS WordPress plugin. An authenticated user with contributor-level access or higher could store script content that runs when another user views it. Business impact is usually account/session risk, content tampering, and trust damage rather than full server compromise.
Executive priority
Prioritize remediation for education or course sites with many content creators. It is not evidenced as actively exploited, but stored XSS can affect privileged users and damage site trust if abused.
Technical view
CVE-2023-35090 is CWE-79 stored XSS in StylemixThemes MasterStudy LMS WordPress Plugin. The bundle describes authenticated contributor+ exploitation, CVSS 3.1 score 6.5, network reachable, low complexity, low privileges, user interaction required, and changed scope. Version evidence conflicts between <=3.0.7 and the title's <=3.0.8.
Likely exposure
Exposure is most likely on WordPress sites using MasterStudy LMS, especially where untrusted or numerous contributor-level users can create course or site content. Public exposure depends on installed plugin version and role assignments.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. The vulnerability requires an authenticated contributor-or-higher user and another user's interaction with stored content, reducing broad unauthenticated attack likelihood but still creating admin-facing risk.
Researcher notes
Evidence supports authenticated stored XSS with CVSS vector AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L. The bundle lacks exploit status, patch version, and detailed affected component. Version evidence is inconsistent, so validation should confirm the vendor advisory before closure.
Mitigation direction
- Check StylemixThemes or Patchstack guidance for the fixed plugin version.
- Update MasterStudy LMS where a fixed version is available.
- Disable or remove the plugin if it is unused.
- Restrict contributor-level access to trusted users only.
- Review recently created LMS content from contributor-level accounts.
Validation and detection
- Inventory WordPress sites for the MasterStudy LMS plugin package.
- Compare installed versions against the vendor or Patchstack advisory.
- Treat <=3.0.7 as affected; verify whether <=3.0.8 is included.
- Review contributor, author, editor, and administrator account assignments.
- Confirm remediation by documenting updated plugin versions.
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-2023-35090 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
- 6.5 (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:L
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:L2.33.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
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.