Security readout for executives and security teams
Plain-English summary
CVE-2023-23328 affects AvantFAX 3.3.7. A logged-in user may be able to bypass upload validation and place a PHP file on the server. If that file can execute, the impact could include data theft, system changes, or service disruption.
Executive priority
Treat this as a high-priority remediation item for any internet-reachable or multi-user AvantFAX deployment. The weakness can turn ordinary upload access into full application compromise if server configuration allows execution.
Technical view
This is a CWE-434 file upload issue in AvantFAX 3.3.7 FileUpload.php. The CVSS 3.1 score is 8.8 with network access, low complexity, low privileges, no user interaction, and high confidentiality, integrity, and availability impact. The source bundle does not name a patch.
Likely exposure
Exposure is most likely where AvantFAX 3.3.7 is deployed and authenticated users can access file upload functionality. Risk increases if uploaded PHP files can execute in web-accessible directories.
Exploitation context
The CVE is not marked as CISA KEV in the provided bundle. The referenced public write-up describes the vulnerability, but the bundle does not provide evidence of active exploitation in the wild.
Researcher notes
The affected-product metadata in the bundle is incomplete, listing vendor and product as n/a, while the title and reference identify AvantFAX 3.3.7. No official fix details are included, so remediation should be verified against project guidance.
Mitigation direction
- Identify and prioritize AvantFAX 3.3.7 systems for review.
- Check AvantFAX project or vendor guidance for fixed versions or official mitigation.
- Restrict upload access to trusted users until remediation is confirmed.
- Prevent PHP execution from upload and attachment directories.
- Review authenticated accounts for least-privilege access.
Validation and detection
- Inventory AvantFAX instances and confirm exact deployed versions.
- Confirm whether FileUpload.php is reachable by authenticated users.
- Review web server configuration for script execution in upload locations.
- Inspect upload directories for unexpected executable server-side files.
- Review logs for suspicious authenticated upload activity.
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 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-2023-23328 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
- High
- CVSS
- 8.8 (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: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.
SSVC decision data
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:H2.85.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/superkojiman/vulnerabilities/blob/master/AvantFAX-3.3.7/README.mdCVE reference, mitre
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.