Security readout for executives and security teams
Plain-English summary
CVE-2026-1666 affects the WordPress Download Manager plugin through version 3.3.46. A crafted link can make script run in a victim’s browser if they click it. This is not server takeover, but it can support phishing, session abuse, or content manipulation against logged-in users.
Executive priority
Treat as a normal-priority web application fix. Prioritize public WordPress sites with user accounts, administrators, or customers likely to follow emailed links. Escalate if the plugin login form is widely exposed.
Technical view
The flaw is reflected cross-site scripting in the Download Manager login form shortcode, caused by insufficient sanitization and escaping of the redirect_to GET parameter. It is unauthenticated, network-accessible, low complexity, and requires user interaction. CVSS is 6.1, CWE-79, with limited confidentiality and integrity impact.
Likely exposure
WordPress sites using Download Manager versions up to and including 3.3.46, especially pages exposing the wpdm_login_form shortcode or plugin login form.
Exploitation context
No CISA KEV listing or provided source indicates active exploitation. Exploitation requires tricking a user into opening a crafted link; impact depends on the victim’s privileges and browser session context.
Researcher notes
The source description clearly identifies reflected XSS through redirect_to in the login form shortcode. The structured affected data appears limited, so use the narrative version range and Wordfence reference. Do not assume exploitation in the wild from the provided sources.
Mitigation direction
- Inventory WordPress sites for the Download Manager plugin and version.
- Upgrade Download Manager beyond 3.3.46 if a vendor-approved fixed release is available.
- Review vendor and WordPress plugin guidance for the confirmed fixed version.
- Limit exposure of plugin login forms where not required.
- Use security controls that reduce reflected XSS impact, such as strong session protections.
Validation and detection
- Confirm whether Download Manager is installed on each WordPress site.
- Identify plugin versions at or below 3.3.46.
- Locate pages using the wpdm_login_form shortcode or plugin login form.
- Review the referenced code paths for redirect_to handling and output escaping.
- Check vendor changelog or WordPress Trac changeset for the applied remediation.
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-2026-1666 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
- Medium
- CVSS
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/3cb84ba3-b403-4a9d-b1a7-92aa947310ac?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/download-manager/tags/3.3.46/src/User/Login.php#L137CVE reference
- https://plugins.trac.wordpress.org/browser/download-manager/tags/3.3.46/src/User/views/login-form.php#L142CVE reference
- https://www.wpdownloadmanager.com/doc/short-codes/wpdm_login_form-user-login-form-short-code/CVE reference
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3455081%40download-manager%2Ftrunk&old=3440008%40download-manager%2Ftrunk&sfp_email=&sfph_mail=#file25CVE 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.
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.