Security readout for executives and security teams
Plain-English summary
Masteriyo LMS for WordPress has a stored XSS issue through version 1.18.3. A logged-in attacker could save unsafe input that later runs in another user's browser after interaction. The likely business risk is compromised user trust, session exposure, or unauthorized page actions.
Executive priority
Treat as a moderate, near-term remediation item for WordPress LMS sites. Prioritize externally facing education portals, sites with many contributors, and environments where administrators view user-submitted course content.
Technical view
CVE-2025-54699 is CWE-79 stored cross-site scripting in Masteriyo LMS <= 1.18.3. CVSS 3.1 is 6.5: AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L. Sources identify improper input neutralization during webpage generation but do not provide exploit details or a confirmed fixed version.
Likely exposure
Exposure is WordPress sites running the Masteriyo - LMS learning-management-system plugin up to and including 1.18.3. Risk is higher where low-privilege users can create or modify LMS content viewed by admins, instructors, or learners.
Exploitation context
The provided bundle does not show CISA KEV listing or active exploitation. Successful abuse requires authenticated access and user interaction, but stored XSS can persist and affect later viewers within the WordPress LMS workflow.
Researcher notes
Evidence is limited to CVE metadata and Patchstack's advisory reference. The sources confirm stored XSS scope and CVSS characteristics, but do not provide sink details, affected parameters, proof of exploitation, or a definitive patched version.
Mitigation direction
- Inventory WordPress sites using the Masteriyo LMS plugin.
- Identify installations running Masteriyo LMS version 1.18.3 or older.
- Check Masteriyo and Patchstack guidance for a fixed release or vendor workaround.
- Restrict LMS content-authoring permissions to trusted users until remediated.
- Review WordPress security monitoring for suspicious content changes.
Validation and detection
- Confirm plugin name and version from WordPress administration or asset inventory.
- Review LMS fields and content areas for unexpected scripts or malformed markup.
- Verify whether vendor guidance identifies a fixed version after 1.18.3.
- Check logs for unusual low-privilege content creation or edits.
- Retest after update using approved XSS validation procedures only.
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-2025-54699 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.