CVE-2026-81825
The Simple Ajax Chat – Add a Fast, Secure Chat Box plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Chat Message in all versions up to, and including, <= 20260811 due to insufficient input sanitization and output escaping.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.49%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
The Simple Ajax Chat – Add a Fast, Secure Chat Box plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Chat Message in all versions up to, and including, <= 20260811 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. The nonce protecting chat message submission is publicly visible on the chat page, rendering it ineffective as an authentication barrier and allowing fully unauthenticated attackers to submit malicious messages that are stored persistently and rendered to all visitors on every page load.
- CVSS 3.1
- 7.2 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- EPSS
- 0.49% probability · 42th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Source
- security@wordfence.com
EPSS 0.5% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://plugins.trac.wordpress.org/browser/simple-ajax-chat/trunk/simple-ajax-chat-core.php#L34
- https://plugins.trac.wordpress.org/browser/simple-ajax-chat/trunk/simple-ajax-chat-form.php#L143
- https://plugins.trac.wordpress.org/browser/simple-ajax-chat/trunk/simple-ajax-chat-form.php#L144
- https://plugins.trac.wordpress.org/browser/simple-ajax-chat/trunk/simple-ajax-chat-form.php#L182
- https://plugins.trac.wordpress.org/browser/simple-ajax-chat/trunk/simple-ajax-chat.php#L329
- https://plugins.trac.wordpress.org/browser/simple-ajax-chat/trunk/simple-ajax-chat.php#L698
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3669278%40simple-ajax-chat%2Ftrunk&old=3640838%40simple-ajax-chat%2Ftrunk&sfp_email=&sfph_mail=
- https://www.wordfence.com/threat-intel/vulnerabilities/id/8336d8d6-81ac-40a6-af1e-167c12440908?source=cve
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.