Security readout for executives and security teams
Plain-English summary
CVE-2021-23123 is an information disclosure issue in Joomla! CMS. A missing access-control check could reveal names of modules that are unpublished or otherwise inaccessible. The sources do not show data theft, code execution, or active exploitation, but exposed module names can help attackers map a site.
Executive priority
Handle during normal vulnerability management unless the affected Joomla! site is high-value or externally exposed. Prioritize upgrade confirmation over emergency response because active exploitation is not evidenced.
Technical view
Joomla! 3.0.0 through 3.9.23 lacked ACL checks in the com_modules orderPosition endpoint. The reported impact is leakage of unpublished or inaccessible module names. No CVSS score, CWE mapping, exploitation evidence, or detailed remediation version is provided in the supplied sources.
Likely exposure
Exposure is limited to Joomla! CMS installations running versions 3.0.0 through 3.9.23, especially sites where the vulnerable com_modules endpoint is reachable.
Exploitation context
The source bundle does not cite active exploitation, and the CVE is not marked as CISA KEV. Treat this as information disclosure useful for reconnaissance, not as confirmed compromise evidence.
Researcher notes
The public details are sparse. Validation should focus on version exposure and whether ACL enforcement prevents disclosure of unpublished or inaccessible module names. Avoid assuming broader impact beyond module-name leakage.
Mitigation direction
- Identify Joomla! sites running 3.0.0 through 3.9.23.
- Review the Joomla! vendor advisory for the supported fixed release path.
- Upgrade affected Joomla! installations according to vendor guidance.
- Restrict administrative and module-management surfaces where operationally possible.
Validation and detection
- Inventory public and internal Joomla! CMS versions.
- Confirm whether any installation remains at 3.9.23 or earlier.
- Review access logs for unusual requests to com_modules endpoints.
- Verify upgraded systems no longer expose inaccessible module names.
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.
CVE-2021-23123 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://developer.joomla.org/security-centre/836-20210101-core-com-modules-exposes-module-names.htmlCVE reference · x_refsource_MISC, vendor-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.