Security readout for executives and security teams
Plain-English summary
This CVE describes a critical file upload flaw in PluckCMS v4.7.10 development versions. A remote attacker could submit a crafted image file and potentially run arbitrary code on the server. That level of impact can lead to full site compromise if an affected instance is exposed.
Executive priority
Treat this as urgent for any internet-facing PluckCMS deployment. The business concern is potential full web server compromise, but urgency depends on whether affected development versions are actually present in your environment.
Technical view
The source bundle maps this to CWE-434: unrestricted upload of a dangerous file type. The reported vector is the save_file() parameter accepting a crafted image file, with CVSS 3.1 score 9.8 and no privileges or user interaction required. Product CPE data is incomplete.
Likely exposure
Exposure is most likely limited to PluckCMS v4.7.10 development-version deployments, especially internet-facing CMS instances with reachable upload functionality. The supplied CVE data does not provide CPEs or a complete affected-version range.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. Risk remains high because the described weakness is remote, unauthenticated, low-complexity, and can result in arbitrary code execution.
Researcher notes
The public data is sparse: affected vendor/product fields are marked n/a, and only the PluckCMS issue is cited. Do not broaden scope beyond PluckCMS v4.7.10 development versions without additional vendor confirmation.
Mitigation direction
- Identify any PluckCMS v4.7.10 development-version deployments.
- Check the PluckCMS issue and vendor guidance for confirmed fixes.
- Remove development builds from production environments.
- Restrict public access to affected upload functionality until remediated.
- Harden file upload controls and server-side execution permissions.
Validation and detection
- Inventory CMS software versions across public web assets.
- Confirm whether PluckCMS v4.7.10 development code is deployed.
- Review exposure of endpoints using save_file() or image upload handling.
- Check web logs for unusual upload attempts or unexpected executable files.
- Verify remediation against vendor guidance once available.
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.
CWE-434: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution 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-2020-20718 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/pluck-cms/pluck/issues/79CVE reference
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.
Unrestricted Upload of File with Dangerous Type
Unrestricted Upload of File with Dangerous Type represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.