Security readout for executives and security teams
Plain-English summary
CVE-2016-10959 affects older Estatik WordPress plugin versions before 2.3.1. A logged-in user, or a logged-in user targeted through CSRF, could upload arbitrary files through the plugin path described in the CVE. For a WordPress site, that can threaten site integrity if uploaded content becomes executable or publicly reachable.
Executive priority
Treat this as a high-priority legacy WordPress plugin issue if Estatik is present. The main business risk is website compromise through unsafe file upload. Priority drops materially if all sites are confirmed upgraded or the plugin is absent.
Technical view
The CVE describes authenticated arbitrary file upload in Estatik before 2.3.1 via the es_media_images[] parameter to wp-admin/admin-ajax.php, with CSRF as an exploitation condition. The source bundle does not provide CVSS, CWE, detailed affected CPEs, or vendor remediation text beyond the fixed-before version boundary.
Likely exposure
Exposure is limited to WordPress installations running the Estatik plugin before version 2.3.1. Sites without this plugin, or with Estatik 2.3.1 or later, are not indicated as affected by the provided sources.
Exploitation context
The CVE is not listed as CISA KEV in the source bundle. The bundle cites a public 2016 vulnerability write-up, but provides no evidence of active exploitation, exploit availability, or observed attacks.
Researcher notes
Evidence is sparse: no CVSS, CWE, CPE, or detailed vendor advisory is present in the bundle. The strongest facts are the affected version boundary, authenticated arbitrary file upload type, CSRF note, and vulnerable endpoint/parameter named in the CVE description.
Mitigation direction
- Upgrade Estatik to version 2.3.1 or later.
- Disable the plugin if upgrade is not immediately possible.
- Review vendor and WordPress plugin guidance for current supported versions.
- Limit WordPress administrative access to trusted users only.
- Review uploaded files for unexpected or unsafe content.
Validation and detection
- Inventory WordPress sites for the Estatik plugin.
- Confirm the installed Estatik version is 2.3.1 or later.
- Check historical uploads for unexpected files added during exposure windows.
- Review logs for suspicious admin-ajax.php activity involving the plugin.
- Confirm no untrusted users retain privileged WordPress access.
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-2016-10959 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://www.pluginvulnerabilities.com/2016/08/19/authenticated-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.