Security readout for executives and security teams
Plain-English summary
NanoCMS 0.4 has an authenticated file upload flaw that can let a logged-in attacker run code on the web server. If an organization still uses this old CMS, compromise could mean full control of the site and access to hosted data. No source provided confirms active exploitation in the wild.
Executive priority
Treat as high priority only if NanoCMS 0.4 is present. Because public exploit material exists and impact is full server compromise, exposed installations should be found quickly, access restricted, and vendor guidance reviewed. If NanoCMS is not in use, no direct action is indicated.
Technical view
CVE-2022-50898 affects kalyan02 NanoCMS 0.4. The issue is CWE-434: unrestricted upload of a file with a dangerous type through page content creation, allowing PHP code placement in the pages directory. CVSS 3.1 is 8.8: network exploitable, low complexity, low privileges required, no user interaction, high CIA impact.
Likely exposure
Exposure is likely limited to internet-facing or internal deployments of NanoCMS 0.4 where attackers can obtain valid credentials. Systems not running NanoCMS 0.4 are listed as unaffected by default in the provided data.
Exploitation context
Public exploit references exist, including Exploit-DB and an exploit archive. The vulnerability requires authentication, reducing opportunistic exposure but increasing risk from weak credentials, reused passwords, or compromised accounts. The source bundle does not include KEV listing or confirmed active exploitation.
Researcher notes
The provided record names NanoCMS 0.4 only and describes authenticated RCE via unvalidated page content creation. Evidence supports public exploit availability, not confirmed active exploitation. The bundle does not name a fixed version or official patch, so remediation should be based on vendor/advisory review or removal/isolation.
Mitigation direction
- Identify and inventory any NanoCMS deployments and confirm version 0.4 exposure.
- Restrict access to NanoCMS administration and page creation functions to trusted users.
- Review vendor repository and advisory sources for upgrade, removal, or hardening guidance.
- If unsupported, consider retiring or isolating NanoCMS 0.4 from production networks.
- Harden web server execution permissions for uploaded or content-managed directories where feasible.
Validation and detection
- Search asset inventory and web roots for NanoCMS installations.
- Confirm whether any discovered installation reports or matches NanoCMS version 0.4.
- Review CMS user accounts for unauthorized, stale, or weakly protected access.
- Inspect pages/content directories for unexpected PHP or recently modified files.
- Check web and authentication logs for suspicious page creation or 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 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-2022-50898 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.
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:H2.85.9Primary CVE scoreVulnerability 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
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-50997CVE reference · exploit
- NanoCMS GitHub RepositoryCVE reference · product
- NanoCMS Exploit ArchiveCVE reference · exploit
- VulnCheck Advisory: NanoCMS 0.4 - Remote Code Execution (RCE) (Authenticated)CVE reference · 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.