Security readout for executives and security teams
Plain-English summary
e107 CMS 2.3.0 can let a logged-in user with theme installation rights turn a theme upload into server code execution. This is high business risk for exposed sites because compromise could affect confidentiality, integrity, and availability of the CMS and hosting environment.
Executive priority
Treat as a high-priority exposure review for any e107 CMS deployment. The main urgency is not broad anonymous exploitation, but the impact is severe if an authenticated account can install themes.
Technical view
The issue is an authenticated remote code execution flaw tied to theme package upload handling in e107 CMS 2.3.0. It maps to CWE-434 and has CVSS 8.8. The source bundle describes crafted theme files being placed under e107_themes and later executed as PHP.
Likely exposure
Exposure is likely limited to organizations running e107 CMS 2.3.0, especially internet-facing instances where non-admin or delegated users can install themes.
Exploitation context
A public ExploitDB reference exists, but the source bundle does not show CISA KEV listing or confirmed active exploitation. Exploitation requires authentication and theme installation permissions, not anonymous access.
Researcher notes
Evidence is strongest for e107 CMS 2.3.0 and authenticated theme upload abuse. The bundle does not name a fixed version, vendor advisory, or active exploitation, so remediation should be anchored to current vendor guidance.
Mitigation direction
- Inventory e107 CMS instances and identify any running version 2.3.0.
- Restrict theme installation permissions to trusted administrators only.
- Review vendor guidance and downloads for a fixed or supported release.
- Inspect installed themes for unexpected PHP files or unauthorized additions.
- Remove suspicious theme uploads and rotate credentials if compromise is suspected.
Validation and detection
- Confirm whether any production or staging site runs e107 CMS 2.3.0.
- Review user roles with theme installation or administrative permissions.
- Check web logs for unexpected theme.php upload activity.
- Inspect e107_themes for unfamiliar files, especially executable PHP content.
- Correlate suspicious files with timestamps, accounts, and access logs.
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-2021-47937 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
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:L/UI:N/S:U/C:H/I:H/A:H2.85.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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
- ExploitDB-50315CVE reference, VulnCheck · exploit
- Official Product HomepageCVE reference, VulnCheck · product
- Product ReferenceCVE reference, VulnCheck · product
- VulnCheck Advisory: e107 CMS 2.3.0 Authenticated Remote Code Execution via Theme UploadCVE 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.