Security readout for executives and security teams
Plain-English summary
CVE-2022-50973 is a critical flaw in Yonyou KSOA 9.0 that can let an unauthenticated internet attacker upload a server-executable file and gain remote code execution. For affected deployments, this is a direct system compromise risk, especially if KSOA is exposed beyond trusted networks.
Executive priority
Treat as urgent for any KSOA 9.0 deployment, especially internet-facing systems. The vulnerability requires no credentials and can lead to full server compromise. Prioritize discovery, exposure reduction, vendor guidance, and compromise assessment.
Technical view
The issue is an unauthenticated arbitrary file upload in the com.sksoft.bill.ImageUpload servlet. Public descriptions say attacker-controlled file path and file name inputs are not adequately authenticated or validated, allowing uploaded JSP content to be executed by the web server. It is classified as CWE-434 with CVSS 3.1 score 9.8.
Likely exposure
Organizations running Yonyou KSOA 9.0 are the stated affected population. Exposure is highest where the application is reachable from the internet or untrusted networks. The source bundle does not identify other affected versions or products.
Exploitation context
CISA KEV is not listed for this CVE. However, the provided description states exploitation evidence was first observed by the Shadowserver Foundation on 2023-11-07 UTC. Public references include technical writeups tagged as exploit descriptions, so defenders should assume practical exploitation knowledge exists.
Researcher notes
Sources identify only Yonyou KSOA 9.0 as affected. No official patch details are included in the provided bundle. Avoid relying solely on CVE publication date; the bundle indicates exploitation evidence predates the 2026 CVE publication.
Mitigation direction
- Identify whether Yonyou KSOA 9.0 is deployed in your environment.
- Check Yonyou guidance or support channels for an official fix or upgrade path.
- Remove public internet exposure until vendor remediation is confirmed.
- Restrict access to KSOA to trusted networks and authenticated administrative users.
- Monitor web roots and upload directories for unexpected executable files.
- Review server logs for suspicious unauthenticated upload activity.
Validation and detection
- Confirm deployed KSOA version and exposure paths.
- Inspect whether the ImageUpload servlet is reachable from untrusted networks.
- Review recent file creation events under application upload or web directories.
- Search logs for anomalous upload requests and unexpected server-side script access.
- Verify vendor-provided remediation or compensating controls are applied.
- Confirm no unauthorized webshells or persistence artifacts remain.
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-2022-50973 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.
SSVC decision data
CVSS vector scores
2 official scoresWe 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:H3.95.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
9.3CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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
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
- Researcher Disclosure (1)CVE reference, VulnCheck · technical-description, exploit
- Researcher Disclosure (2)CVE reference, VulnCheck · exploit, technical-description
- Researcher Disclosure (3)CVE reference, VulnCheck · technical-description, exploit
- Vendor HomepageCVE reference, VulnCheck · product
- https://www.vulncheck.com/advisories/yonyou-ksoa-unauthenticated-file-upload-rce-via-imageupload-servletCVE reference, VulnCheck · third-party-advisory
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.