Security readout for executives and security teams
Plain-English summary
CVE-2026-0555 affects the Premmerce WordPress plugin through version 1.3.20. A logged-in user with Subscriber-level access or higher could save script content that later runs when someone opens the Premmerce Wizard admin page. This is a medium-risk issue mainly threatening admin session trust and site management integrity.
Executive priority
Treat as a scheduled but prompt WordPress security task. Prioritize sites with customer registration, many low-privilege users, or sensitive admin workflows. It is not confirmed as actively exploited, but the low privilege requirement makes exposure broader than typical admin-only plugin flaws.
Technical view
The issue is stored cross-site scripting in the premmerce_wizard_actions AJAX endpoint. Sources attribute it to missing capability checks plus insufficient sanitization and output escaping of the state parameter. The stored payload executes in the Premmerce Wizard admin page context. CVSS 3.1 is 6.4: AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
Likely exposure
Exposure is limited to WordPress sites using Premmerce versions up to and including 1.3.20 where untrusted or compromised Subscriber-level accounts can authenticate. Sites with open registration or many low-privilege users have higher practical risk.
Exploitation context
No CISA KEV listing or provided source indicates active exploitation. Exploitation requires authenticated access, but only low-privilege Subscriber access is needed. The impact depends on an administrator or authorized user visiting the affected Premmerce Wizard admin page after malicious content is stored.
Researcher notes
The public record points to missing capability checks and improper handling of state across the AJAX handler, API, and wizard view. The WordPress Trac changeset is relevant, but the supplied evidence does not clearly name a fixed plugin release. Avoid assuming exploit availability or active exploitation.
Mitigation direction
- Inventory WordPress sites for the Premmerce plugin and version.
- If running 1.3.20 or earlier, check vendor guidance and update when a fixed release is available.
- Disable or remove the plugin if it is not business-critical.
- Limit Subscriber account creation and review untrusted low-privilege users.
- Monitor WordPress admin activity for unexpected Premmerce Wizard changes.
Validation and detection
- Confirm whether Premmerce is installed on each WordPress site.
- Record the installed plugin version and compare against 1.3.20.
- Review plugin changelog or vendor advisory for a fixed version.
- Assess whether public registration or untrusted Subscriber accounts are enabled.
- Check relevant admin pages for unexpected stored content or script-like entries.
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-2026-0555 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
- 6.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/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:L/UI:N/S:C/C:L/I:L/A:N3.12.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/90b2a644-19a0-43a1-8ff6-7486d7ef29b3?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/premmerce/tags/1.3.20/src/Admin/Admin.php?marks=41#L41CVE reference
- https://plugins.trac.wordpress.org/browser/premmerce/tags/1.3.20/src/Admin/Handlers/WizardHandler.php?marks=42,50,52#L42CVE reference
- https://plugins.trac.wordpress.org/browser/premmerce/tags/1.3.20/src/Api/WizardApi.php?marks=38#L38CVE reference
- https://plugins.trac.wordpress.org/browser/premmerce/tags/1.3.20/views/admin/tabs/wizard.php?marks=30#L30CVE reference
- https://plugins.trac.wordpress.org/changeset/3464825/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.
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.