CVE-2026-8420 json
BLOGCHAT Chat System <= 1.3.6.3 - Cross-Site Request Forgery to Stored Cross-Site Scripting via Settings Update
published 2026-05-20 5 mo ago modified 2026-07-23 3 mo ago also EUVD-2026-31028
- cvss
- 6.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 6%
- public exploits
- 0
- none known
Summary
The BLOGCHAT Chat System plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.3.6.3. This is due to missing or incorrect nonce validation on a function. This makes it possible for unauthenticated attackers to update settings and inject malicious web scripts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected products
- rdbeach BLOGCHAT Chat System
Classification
- Weakness
-
- CWE-352 Cross-Site Request Forgery
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/a62186aa-19aa-445b-8fdc-b029bdafd58f?source=cve
- plugins.trac.wordpress.org /browser/blogchat-chat-system/trunk/wp-blogchat-widget.php#L208
- plugins.trac.wordpress.org /browser/blogchat-chat-system/tags/1.3.6.3/wp-blogchat-widget.php#L208
- plugins.trac.wordpress.org /browser/blogchat-chat-system/trunk/wp-blogchat-widget.php#L215
- plugins.trac.wordpress.org /browser/blogchat-chat-system/tags/1.3.6.3/wp-blogchat-widget.php#L215
- plugins.trac.wordpress.org /browser/blogchat-chat-system/trunk/wp-blogchat-widget.php#L222
- plugins.trac.wordpress.org /browser/blogchat-chat-system/tags/1.3.6.3/wp-blogchat-widget.php#L222
- plugins.trac.wordpress.org /browser/blogchat-chat-system/trunk/wp-blogchat-widget.php#L293
- plugins.trac.wordpress.org /browser/blogchat-chat-system/tags/1.3.6.3/wp-blogchat-widget.php#L293
Sources
- CVE List CVE-2026-8420
- NVD CVE-2026-8420
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.