Security readout for executives and security teams
Plain-English summary
CVE-2026-2506 affects the EM Cost Calculator WordPress plugin through version 2.3.1. An unauthenticated visitor can submit a crafted customer name that is saved and later runs script in an administrator’s browser when the customer list is viewed. This is a moderate business risk for sites using the plugin.
Executive priority
Prioritize remediation on internet-facing WordPress sites where the plugin is active. This is not currently evidenced as exploited in the provided sources, but unauthenticated stored XSS can affect administrator sessions and should be handled in the normal patch cycle or sooner for high-value sites.
Technical view
This is stored cross-site scripting, CWE-79, in EM Cost Calculator <= 2.3.1. The plugin stores attacker-controlled customer_name data and renders it in the admin EMCC Customers page without output escaping. CVSS 3.1 is 6.1: network exploitable, low complexity, no privileges required, user interaction required, changed scope, low confidentiality and integrity impact.
Likely exposure
Exposure is likely limited to WordPress sites with EM Cost Calculator installed at version 2.3.1 or earlier. Risk is higher if unauthenticated users can submit calculator/customer data that reaches the EMCC Customers admin page.
Exploitation context
The source bundle does not show CISA KEV listing or cited active exploitation. Exploitation requires an administrator or privileged user to view the affected customer list after malicious data has been stored. The impact is browser-side script execution in that admin context.
Researcher notes
The cited code references indicate customer data handling in em-cost-calculator-widget.php and admin rendering in em-cost-calc-admin-page.php. The bundle names no fixed version. Avoid assuming a patch exists; verify upstream plugin status and compare code for proper escaping before closing.
Mitigation direction
- Identify WordPress sites using EM Cost Calculator.
- Check whether installed versions are 2.3.1 or earlier.
- Review vendor and WordPress plugin guidance for a fixed release or official mitigation.
- Disable or remove the plugin if business need is low and no fix is available.
- Limit administrative access and monitor unusual customer entries until remediated.
Validation and detection
- Inventory the plugin version across WordPress sites.
- Confirm whether public users can submit customer_name data.
- Review EMCC Customers page handling for unescaped customer_name output.
- Check logs or records for suspicious customer_name values.
- Track vendor advisories for fixed-version confirmation.
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-2026-2506 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/1eef338a-ccc7-41a2-b87a-0945e39380d2?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/cost-calculator/tags/2.3.1/em-cost-calculator-widget.php#L655CVE reference
- https://plugins.trac.wordpress.org/browser/cost-calculator/tags/2.3.1/em-cost-calc-admin-page.php#L59CVE 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.