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TI-2021-06841 Aliases CVE-2021-24556GHSA-559v-8mcf-64p4

Email Subscriber <= 1.1 - Unauthenticated Stored Cross-Site Scripting (XSS)

Priority LOW 30CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

The kento_email_subscriber_ajax AJAX action of the Email Subscriber WordPress plugin through 1.1, does not properly sanitise, validate and escape the submitted subscribe_email and subscribe_name POST parameters, inserting them in the DB and then outputting them back in the Subscriber list (/wp-admin/edit.php?post_type=kes_campaign&page=kento_email_subscriber_list_settings), leading a Stored XSS issue.

Why it matters now

EPSS 0.01344 71st percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
UnknownEmail Subscriber1.1 – 1.1—No fix listedCNA
  • Email Subscriber VendorUnknown Affected 1.1 – 1.1 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:email-subscriber_project:email-subscriber:*:*:*:*:*:wordpress:*:*up to 1.1VulnerableEmail-subscriber Project
  • cpe:2.3:a:email-subscriber_project:email-subscriber:*:*:*:*:*:wordpress:*:* Versions up to 1.1 Vulnerable ·Email-subscriber Project

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-24556
  2. 2026-10-03 Alias added: GHSA-559v-8mcf-64p4

References

Exploit 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences