Medium severity · published Mar 12, 2026
CVE-2026-2987
Simple Ajax Chat <= 20260217 - Unauthenticated Stored Cross-Site Scripting via 'c'
6.1
CVSS
0.2%
EPSS
No
On KEV
Description
The Simple Ajax Chat plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'c' parameter in versions up to, and including, 20260217 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 7% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SA
Simple Ajax Chat – Add a Fast, Secure Chat Box · specialk
through 20260217 · source: vendor
Affected product
SA
Simple Ajax Chat – Add a Fast, Secure Chat Box
specialk
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-2987
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-2987
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/changeset/3472258/simple-ajax-chat
www.wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/3c07dec6-ddb7-45df-8bdf-57f562102c4b?source=cve
More from Simple Ajax Chat – Add a Fast, Secure Chat Box
7.2
CVE-2026-81825
Simple Ajax Chat <= 20260811 - Unauthenticated Stored Cross-Site Scripting