Security readout for executives and security teams
Plain-English summary
CVE-2021-38710 describes a stored cross-site scripting issue in Yclas 4.3.0. A malicious value for the site name during installer use could be saved in the database and later run in a user's browser. Source data does not provide a CVSS score, fixed version, or vendor mitigation.
Executive priority
Prioritize validation where Yclas is public-facing or installer components remain accessible. Business urgency is uncertain because the official data lacks severity scoring and fix details, but stored XSS can affect user trust and administrative sessions.
Technical view
The reported flaw is persistent XSS in Yclas 4.3.0 through install/view/form.php. The vulnerable SITE_NAME parameter can store attacker-controlled script content in the database. The CVE source bundle does not list CVSS, CWE, CPEs, fixed releases, or detailed vendor remediation.
Likely exposure
Likely limited to Yclas 4.3.0 deployments where the installer form is reachable and accepts SITE_NAME input. Exposure is unclear because the CVE record's affected product metadata is incomplete.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Public reference material exists, but the bundle does not support claims of in-the-wild exploitation.
Researcher notes
The core evidence is a public CVE description and GitHub reference. Metadata gaps are significant: no CVSS, CWE, CPE, affected vendor field, patch version, or confirmed exploitation. Avoid broad product assumptions beyond Yclas 4.3.0.
Mitigation direction
- Check Yclas vendor or project guidance for fixed versions.
- Identify and upgrade any Yclas 4.3.0 deployments if vendor guidance recommends it.
- Restrict access to installer paths pending vendor-confirmed remediation.
- Review stored SITE_NAME values for unexpected script-like content.
- Treat exposed installer functionality as higher priority for remediation.
Validation and detection
- Inventory internet-facing and internal Yclas deployments.
- Confirm whether any instance is running version 4.3.0.
- Check whether install/view/form.php is present or reachable.
- Review application data for suspicious SITE_NAME values.
- Look for browser-side script execution reports tied to site-name rendering.
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.
Database behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-38710 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/security-n/CVE-2021-38710CVE reference · x_refsource_MISC
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.