Security readout for executives and security teams
Plain-English summary
CVE-2021-39496 is a reflected cross-site scripting issue reported in Eyoucms 1.5.4. A crafted filename parameter may cause attacker-controlled script content to be reflected to a user. Business impact depends on whether vulnerable Eyoucms pages are exposed and whether users can be lured into opening malicious links.
Executive priority
Treat this as a focused web application risk, not an emergency unless Eyoucms 1.5.4 is internet-facing or used by privileged users. Prioritize inventory and vendor-guided remediation.
Technical view
The CVE description states Eyoucms 1.5.4 does not sanitize input in the filename parameter, enabling reflected XSS. The source bundle does not provide CVSS, CWE, exact route details, affected CPEs, or a confirmed fixed version.
Likely exposure
Exposure is most likely for internet-facing Eyoucms 1.5.4 deployments that process a filename parameter in reachable functionality. The official affected metadata is incomplete, so confirm product and version locally.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation. Public references include the Eyoucms v1.5.4 release and a GitHub CVE repository, but the provided bundle does not establish real-world exploitation.
Researcher notes
Evidence is sparse. The CVE record names Eyoucms 1.5.4 and a filename parameter, but lacks CVSS, CWE, route, payload context, and fixed-version data. Avoid broad product assumptions beyond the cited description.
Mitigation direction
- Identify any Eyoucms 1.5.4 deployments and owners.
- Check Eyoucms vendor guidance for fixed versions or recommended remediation.
- Upgrade away from affected code if a vendor-supported fix is available.
- Limit public access to vulnerable functionality where business requirements allow.
- Ensure filename output is properly encoded and untrusted input is sanitized.
Validation and detection
- Inventory web assets for Eyoucms and confirm exact deployed versions.
- Review affected code paths that accept or reflect filename values.
- Perform controlled testing with non-executing markers in a safe environment.
- Confirm reflected filename values are encoded before browser rendering.
- Check logs for suspicious requests targeting filename parameters.
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.
CVE-2021-39496 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/eyoucms/eyoucms/releases/tag/v1.5.4CVE reference · x_refsource_MISC
- https://github.com/KietNA-HPT/CVECVE 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.