Security readout for executives and security teams
Plain-English summary
CVE-2016-10958 affects the WordPress Estatik plugin before 2.3.0. The reported issue allowed unauthenticated arbitrary file uploads through WordPress AJAX handling. For a business, the urgent question is whether any public WordPress site still runs this old plugin version.
Executive priority
Treat this as a high-priority legacy WordPress exposure. The main business risk is an old public plugin allowing unauthenticated uploads. Prioritize asset discovery, plugin upgrade or removal, and compromise review for any affected sites.
Technical view
The CVE describes unauthenticated arbitrary file upload in Estatik before 2.3.0 via the es_media_images[] parameter to wp-admin/admin-ajax.php. The source bundle provides no CVSS, CWE, or confirmed exploit-in-the-wild evidence. Arbitrary upload in WordPress is generally high-risk, but exact impact depends on server execution controls and uploaded file handling.
Likely exposure
Exposure is most likely on internet-facing WordPress sites with Estatik installed below version 2.3.0. Sites without Estatik, or with version 2.3.0 or newer, are not indicated as affected by the provided sources.
Exploitation context
The bundle does not establish active exploitation, and the CVE is not marked KEV. The issue is unauthenticated, which lowers attacker friction, but the sources do not provide validated prevalence, exploit maturity, or post-upload impact details.
Researcher notes
Evidence is narrow but clear on affected component, version boundary, and upload vector. The bundle lacks CVSS, CWE, affected CPEs, and exploit confirmation. Avoid assuming active exploitation or specific payload outcomes without additional source-backed evidence.
Mitigation direction
- Upgrade Estatik to version 2.3.0 or later through trusted vendor channels.
- Disable or remove Estatik if immediate upgrade is not possible.
- Review vendor and WordPress plugin guidance for current remediation notes.
- Harden upload handling and prevent execution from upload directories.
- Back up and inspect affected WordPress sites before returning them to service.
Validation and detection
- Inventory WordPress sites for Estatik plugin installation and version.
- Confirm installed Estatik versions are 2.3.0 or newer.
- Review logs for unauthenticated admin-ajax.php upload activity.
- Inspect upload and plugin media directories for unexpected files.
- Check web server rules preventing execution from upload paths.
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.
File 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-2016-10958 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://wordpress.org/plugins/estatik/#developersCVE reference · x_refsource_MISC
- https://estatik.net/estatik-released-security-updates/CVE reference · x_refsource_MISC
- https://www.pluginvulnerabilities.com/2016/08/01/arbitrary-file-upload-vulnerability-in-estatik/CVE 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.