Security readout for executives and security teams
Plain-English summary
CMSimple 5.2 has a stored cross-site scripting flaw in the Filebrowser “External” input. An attacker can save JavaScript that later runs in another user’s browser when Page or Files tabs are opened. This can expose session data or alter page actions, but it requires user interaction and is not listed as actively exploited.
Executive priority
Treat as a moderate web-application risk. Prioritize if CMSimple 5.2 is internet-facing or used by privileged content managers. The main business concern is browser-based compromise of users interacting with the CMS interface, not server takeover based on current evidence.
Technical view
CVE-2021-47732 is CWE-79 stored XSS affecting CMSimple 5.2. The reported sink is the Filebrowser External input field, which does not adequately filter JavaScript. CVSS 3.1 is 6.1: network reachable, low complexity, no privileges, user interaction required, scope changed, low confidentiality and integrity impact, no availability impact.
Likely exposure
Exposure is limited to organizations running CMSimple 5.2, especially internet-facing administrative or content-management interfaces where the vulnerable filebrowser input is reachable. Confirm exact deployment and version before prioritizing remediation.
Exploitation context
A public Exploit-DB entry exists, indicating exploit knowledge is public. The provided sources do not show CISA KEV listing or confirmed active exploitation. Successful impact depends on stored script execution when a user interacts with affected CMSimple tabs.
Researcher notes
The source bundle identifies CMSimple 5.2 only. No official patch version, mitigation advisory, or active exploitation evidence is provided. Avoid expanding affected versions without vendor confirmation. Public exploit availability increases validation urgency but does not prove real-world exploitation.
Mitigation direction
- Identify any CMSimple 5.2 installations and owners.
- Check CMSimple vendor guidance for fixed versions or official remediation.
- Upgrade or replace affected CMSimple 5.2 deployments when a supported fix is available.
- Restrict access to CMSimple administration and filebrowser functions to trusted users.
- Review content inputs for unauthorized scripts and remove suspicious entries.
Validation and detection
- Inventory web assets for CMSimple and confirm version 5.2 exposure.
- Verify whether the Filebrowser External input is enabled or accessible.
- Review CMSimple content and filebrowser configuration for unexpected script content.
- Check web logs for unusual access to CMSimple filebrowser or admin paths.
- Document compensating controls if immediate upgrade is not available.
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-2021-47732 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
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-49751CVE reference · exploit
- Official CMSimple Vendor HomepageCVE reference · product
- VulnCheck Advisory: CMSimple 5.2 Stored Cross-Site Scripting via Filebrowser External InputCVE reference · third-party-advisory
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.