Security readout for executives and security teams
Plain-English summary
CVE-2021-23258 affects Crafter CMS 3.1. A highly privileged authenticated user, with Administrator or Developer access, could abuse unrestricted Spring Expression Language handling to run operating system commands. The business impact is mainly availability disruption, and the source bundle does not support claims of active exploitation.
Executive priority
Treat as a targeted privileged-user risk. It is not presented as mass-exploited, but affected Crafter CMS 3.1 systems should be reviewed because compromise of high-privilege accounts could affect service availability.
Technical view
The issue is a Spring SPEL expression injection in Crafter CMS 3.1 Spring beans, mapped to CWE-913. CVSS 3.1 is 4.2 with network access, high complexity, high privileges, user interaction, unchanged scope, and high availability impact only.
Likely exposure
Exposure is limited to Crafter CMS 3.1 deployments where users hold Administrator or Developer roles and can reach the affected administrative functionality.
Exploitation context
No active exploitation is established by the supplied sources. The CVE is not listed as KEV in the bundle. Exploitation requires a privileged authenticated user and user interaction, which lowers broad internet-scale risk but matters for insider or account-compromise scenarios.
Researcher notes
Evidence is limited to the CVE description, CVSS vector, CWE, affected product/version, and Crafter advisory reference. The bundle does not name a fixed version, patch details, proof of exploitation, or broader affected releases.
Mitigation direction
- Review the Crafter CMS advisory for vendor-approved fixes or workarounds.
- Inventory Crafter CMS 3.1 instances and prioritize confirmed deployments.
- Restrict Administrator and Developer roles to trusted, necessary users only.
- Monitor privileged account activity until vendor guidance is applied.
Validation and detection
- Confirm whether any production or staging systems run Crafter CMS 3.1.
- List users assigned Administrator or Developer roles.
- Review recent privileged configuration changes involving Spring beans.
- Check logs for unusual privileged actions or availability-impacting command execution indicators.
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-913: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupCVE-2021-23258 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
- Medium
- CVSS
- 4.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/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:H/PR:H/UI:R/S:U/C:N/I:N/A:H0.53.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.2MediumVector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://docs.craftercms.org/en/3.1/security/advisory.html#cv-2021120101CVE reference · x_refsource_MISC
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.
Improper Control of Dynamically-Managed Code Resources
Improper Control of Dynamically-Managed Code Resources represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.