Security readout for executives and security teams
Plain-English summary
A WordPress plugin used for mail queuing can store malicious script inside an email subject. If an administrator or other user views the affected queued-mail page, the script can run in their browser. This is a high-risk web application flaw, but the provided sources do not show active exploitation.
Executive priority
Prioritize remediation on WordPress sites that use this plugin, especially externally facing sites or sites reviewed by administrators. The business risk is browser-based compromise of privileged sessions or content manipulation from stored malicious email subjects.
Technical view
CVE-2023-3167 is stored cross-site scripting in the Mail Queue WordPress plugin through version 1.1. Insufficient subject sanitization and output escaping allow unauthenticated script injection that executes when an injected page is viewed. The CVSS v3.1 score is 7.2 with network access, low complexity, no privileges, and changed scope.
Likely exposure
Exposure is limited to WordPress sites with the wdm-team Mail Queue plugin installed at versions up to and including 1.1. Risk increases where unauthenticated users can cause email subjects to enter the queue and privileged users review queued mail in WordPress.
Exploitation context
The source bundle states unauthenticated attackers can inject stored scripts via email subjects. It does not include public exploit details, confirmed weaponization, or CISA KEV listing. Treat exploitation as plausible for exposed affected sites, but not confirmed active from these sources.
Researcher notes
The affected metadata in the bundle is sparse, while the narrative clearly states versions through 1.1 are vulnerable. The referenced changeset likely contains remediation context, but the bundle does not name a fixed release. Avoid claiming active exploitation without additional evidence.
Mitigation direction
- Inventory WordPress sites for the Mail Queue plugin and version.
- Update, remove, or disable affected versions pending vendor-confirmed remediation.
- Review the referenced WordPress changeset and plugin guidance for the fixed behavior.
- Limit access to mail queue review pages to trusted administrators.
- Treat suspicious queued email subjects as potentially hostile content.
Validation and detection
- Confirm whether Mail Queue is installed and enabled on each WordPress site.
- Identify any installed version up to and including 1.1.
- Review queued mail subjects for unexpected script-like or markup content.
- Verify rendered queue pages escape subject output after remediation.
- Check security monitoring for suspicious unauthenticated mail submissions.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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 lookupCVE-2023-3167 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
- High
- CVSS
- 7.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
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:C/C:L/I:L/A:N3.92.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.2HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source materials
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 Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.