Security readout for executives and security teams
Plain-English summary
WISA Smart Wing CMS has an input-validation flaw that can let a remote attacker retrieve server files. For executives, the main risk is exposure of sensitive data stored on or reachable from the CMS host. Affected versions are not specified in the provided sources, so any known Smart Wing CMS deployment should be treated as needing review.
Executive priority
Prioritize this as high for any confirmed Smart Wing CMS deployment, especially if exposed to the internet or hosting sensitive data. The main business concern is broad file disclosure from the server.
Technical view
CVE-2021-26639 is described as missing validation in specific Smart Wing CMS functions, enabling remote file leakage. The CVSS 3.1 score is 8.1 with network access, low complexity, high confidentiality impact, and high integrity impact. The source text says no login is needed, while the CVSS vector lists low privileges, so authentication requirements are unclear.
Likely exposure
Exposure is limited to organizations running WISA corp. Smart Wing CMS. Version details are unspecified, and no CPEs are provided. Internet-facing CMS instances or systems storing sensitive files on the same server are the most concerning.
Exploitation context
The provided bundle does not show CISA KEV listing or cited evidence of active exploitation. The vulnerability is remotely reachable and low complexity per CVSS, but public exploit status is not established by the supplied sources.
Researcher notes
Evidence is sparse: product is named, versions are unspecified, and authentication requirements conflict between the narrative and CVSS vector. Avoid assuming patch status or exploit availability without vendor or KR CERT confirmation.
Mitigation direction
- Check WISA or KR CERT guidance for affected versions and fixes.
- Restrict Smart Wing CMS access to trusted networks where possible.
- Remove sensitive files from the CMS host if not required.
- Review CMS and web server logs for unusual file access.
- Apply vendor-provided updates or workarounds when confirmed available.
Validation and detection
- Inventory all WISA Smart Wing CMS deployments.
- Confirm whether any deployment is internet-facing.
- Identify product version and compare against vendor guidance.
- Review file access logs for unexpected downloads.
- Validate controls using authorized, non-destructive testing only.
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
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CWE-20: Exact CWE lookup
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Open ATT&CK lookupCWE-494: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-26639 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:L/UI:N/S:U/C:H/I:H/A:N2.85.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.krcert.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=66875CVE 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.