Security readout for executives and security teams
Plain-English summary
Maccms10 has a reported template upload flaw that could let an attacker upload a file that bypasses filename suffix checks and then execute code. The public record lacks version, patch, and authentication details, so exposure must be confirmed locally before prioritization is final.
Executive priority
Treat as high priority if Maccms10 is in use, especially on internet-facing systems. Potential code execution makes impact serious, but incomplete public evidence prevents a more definitive rating.
Technical view
CVE-2020-21359 describes arbitrary file upload in Maccms10's Template Upload function. The stated bypass involves adding a character to the end of an uploaded filename to evade suffix whitelist verification, potentially enabling arbitrary code execution. Sources do not provide CVSS, affected versions, CWE, patch status, or required privileges.
Likely exposure
Organizations running Maccms10 with the Template Upload function reachable are the most likely exposed. Public sources do not state affected versions or whether authentication is required.
Exploitation context
CISA KEV is false in the provided bundle, and the sources do not claim active exploitation. The GitHub issue is the primary public reference, but details are limited.
Researcher notes
The record is sparse: no CVSS, affected version range, CWE, patch reference, or authentication context. Avoid assuming exploitability beyond the stated Template Upload suffix whitelist bypass and potential arbitrary code execution.
Mitigation direction
- Check Maccms10 vendor/project guidance and issue #80 for confirmed fixes.
- Restrict Template Upload access to trusted administrators only.
- Disable Template Upload if it is not operationally required.
- Review uploaded template directories for unexpected executable files.
- Apply a vendor-confirmed update when available.
Validation and detection
- Inventory all Maccms10 deployments and their versions.
- Confirm whether Template Upload is enabled and reachable.
- Review access controls around template administration features.
- Inspect recent uploads and server logs for suspicious filenames.
- Document whether a vendor-confirmed patch exists for your version.
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.
Execution 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-21359 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/magicblack/maccms10/issues/80CVE 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.