Security readout for executives and security teams
Plain-English summary
Freeter 1.2.1 has a stored cross-site scripting flaw. Malicious content can be saved in widget titles or files and later run when a user interacts with the application. The sources describe possible escalation impact, including remote code execution, but do not show confirmed real-world exploitation.
Executive priority
Treat as a high-priority endpoint/application risk if Freeter is used. Prioritize inventory and user exposure reduction now, because public exploit references exist and no confirmed fix is provided in the source bundle.
Technical view
CVE-2021-47835 is CWE-79 persistent XSS in Freeter 1.2.1. The CVSS 3.1 score is 7.2 with network attack vector, low complexity, no privileges, and changed scope. Public exploit and proof-of-concept references exist. No vendor patch details are provided in the supplied sources.
Likely exposure
Exposure is likely limited to organizations or users running Freeter 1.2.1, especially where users open shared or untrusted Freeter files or configure custom widgets from untrusted sources.
Exploitation context
Public exploit material and a proof-of-concept video are referenced, so the issue is reproducible. The source bundle does not indicate CISA KEV listing or confirmed active exploitation in the wild.
Researcher notes
The record names Freeter 1.2.1 only. The bundle includes ExploitDB and PoC references, but not exploitation telemetry. The description links stored XSS to potential remote code execution; validate that claim against advisory details before expanding impact assumptions.
Mitigation direction
- Identify whether Freeter 1.2.1 is installed or in use.
- Check Freeter and advisory sources for updated vendor guidance or fixed versions.
- Avoid opening untrusted Freeter files or widget configurations.
- Remove suspicious custom widget titles or files from Freeter workspaces.
- Limit use of Freeter to trusted content until remediation is confirmed.
Validation and detection
- Inventory endpoints for Freeter and confirm version 1.2.1 presence.
- Review Freeter workspaces for untrusted custom widget titles or files.
- Check security tools for script execution alerts linked to Freeter activity.
- Verify whether vendor guidance or a newer safe version is available.
- Document affected users and exposure to shared Freeter content.
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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-47835 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
- High
- CVSS
- 7.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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:N/S:C/C:L/I:L/A:N3.92.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.2HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-49833CVE reference · exploit
- Official Freeter Product HomepageCVE reference · product
- Proof of Concept VideoCVE reference · exploit
- VulnCheck Advisory: Freeter 1.2.1 - Persistent Cross-Site ScriptingCVE 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.