Security readout for executives and security teams
Plain-English summary
CVE-2021-39501 describes an open redirect in EyouCMS 1.5.4 through the logout function. A user could be sent from a legitimate site to a malicious URL, supporting phishing or trust-abuse scenarios. The provided sources do not include a CVSS score, patch details, or evidence of active exploitation.
Executive priority
Prioritize validation if EyouCMS is public-facing or supports customer, partner, or administrator access. The issue is not reported as actively exploited in the provided sources, but open redirects can strengthen phishing campaigns by abusing trusted domains.
Technical view
The issue is reported as an open redirect in EyouCMS 1.5.4 related to logout handling. The source bundle does not provide structured affected CPEs, a CWE, detailed root cause, or fixed version. Treat the affected scope as limited to the reported EyouCMS 1.5.4 evidence unless vendor guidance says otherwise.
Likely exposure
Exposure is most relevant for internet-facing EyouCMS 1.5.4 sites, especially where users trust logout links or receive site-branded links. The bundle lists affected metadata as n/a, so confirm actual product and version locally before assuming impact.
Exploitation context
The CVE source says attackers can redirect users to a malicious URL via logout. The bundle does not cite CISA KEV listing, public active exploitation, or weaponized exploit evidence. Risk is mainly user redirection, phishing enablement, and reputational harm rather than direct server compromise.
Researcher notes
Evidence is thin: the CVE states open redirect through logout, but the bundle lacks CVSS, CWE, CPEs, patch version, and root-cause detail. Keep analysis scoped to EyouCMS 1.5.4 and avoid claiming broader affected versions without vendor confirmation.
Mitigation direction
- Check vendor or project guidance for a fixed EyouCMS version or official workaround.
- Upgrade EyouCMS if an official patched release is available for your deployment.
- Restrict logout redirects to same-origin or an explicit trusted allowlist.
- Monitor logs for suspicious logout requests containing external redirect targets.
Validation and detection
- Inventory EyouCMS deployments and confirm whether version 1.5.4 is present.
- Review logout behavior in a safe test environment for external redirect acceptance.
- Check web server logs for unusual outbound redirect parameters around logout requests.
- Confirm whether vendor advisories or project issues identify a fixed release.
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-2021-39501 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/issues/17CVE 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.