Security readout for executives and security teams
Plain-English summary
CVE-2026-1306 affects the WordPress midi-Synth plugin. An unauthenticated attacker may upload arbitrary files because the plugin’s export AJAX action lacks proper file type and extension checks. The reported nonce is exposed in frontend JavaScript, making access easier. Successful abuse could lead to full site compromise.
Executive priority
Prioritize immediately for any WordPress site using midi-Synth. The vulnerability is unauthenticated, critical severity, and may enable remote code execution, but active exploitation is not confirmed in the provided sources.
Technical view
The issue is CWE-434 in midi-Synth versions up to and including 1.1.0. The export AJAX action permits arbitrary file upload without adequate validation. The CVSS 3.1 score is 9.8, network exploitable, low complexity, no privileges, no user interaction, with high confidentiality, integrity, and availability impact.
Likely exposure
Internet-facing WordPress sites running midi-Synth through version 1.1.0 are the likely exposure. The source bundle does not identify other affected products. Validate installed plugin presence and version before assuming exposure.
Exploitation context
The CVE record states remote unauthenticated exploitation is possible if an attacker obtains a valid nonce, and that the nonce is exposed in frontend JavaScript. No KEV listing or cited source in the bundle confirms active exploitation.
Researcher notes
Evidence comes from the CVE/Wordfence description and WordPress plugin source references. The bundle includes a changeset reference but does not clearly name a fixed version. Treat patch status as unconfirmed unless vendor guidance states otherwise.
Mitigation direction
- Disable or remove midi-Synth until a fixed release is verified.
- Check vendor or WordPress plugin repository guidance for an official patched version.
- Update only to a vendor-confirmed fixed release when available.
- Investigate and clean unexpected uploaded files before re-enabling the plugin.
Validation and detection
- Inventory WordPress sites for the midi-Synth plugin.
- Record installed midi-Synth versions and flag versions up to 1.1.0.
- Review web-accessible upload paths for unexpected files.
- Review logs for suspicious requests involving the plugin export AJAX action.
- Confirm remediation against vendor guidance before closing the finding.
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-2026-1306 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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.
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:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/d5b695d7-c690-4748-b218-5699d1aa63bf?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/midi-synth/tags/1.1.0/midiSynthConvert.php#L421CVE reference
- https://plugins.trac.wordpress.org/browser/midi-synth/tags/1.1.0/midiSynth.php#L121CVE reference
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3460788%40midi-synth&new=3460788%40midi-synth&sfp_email=&sfph_mail=CVE reference
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.