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CVE-2026-39483 Hidekazu Ishikawa CVE debrief

A Stored XSS vulnerability was discovered in VK All in One Expansion Unit, a WordPress plugin. The vulnerability is caused by improper neutralization of input during web page generation, allowing an attacker with low privileges to inject malicious scripts into the web page. This could lead to unauthorized actions on behalf of other users. The vulnerability has a CVSS score of 6.5, indicating a medium severity level. Administrators and users of VK All in One Expansion Unit should be aware of this vulnerability and take necessary actions to mitigate it.

Vendor
Hidekazu Ishikawa
Product
VK All in One Expansion Unit
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-08
Original CVE updated
2026-07-24
Advisory published
2026-04-08
Advisory updated
2026-07-24

Who should care

Administrators and users of VK All in One Expansion Unit should be aware of this vulnerability and take necessary actions to mitigate it. This vulnerability can be exploited by an attacker with low privileges, and the impact can be significant if not addressed promptly. Security teams and vulnerability management teams should prioritize patching or mitigating this vulnerability.

Technical summary

The CVE-2026-39483 vulnerability is a Stored XSS issue in VK All in One Expansion Unit, a WordPress plugin. The vulnerability exists due to improper neutralization of input during web page generation, allowing an attacker with low privileges to inject malicious scripts into the web page. This could lead to unauthorized actions on behalf of other users. The CVSS score for this vulnerability is 6.5, indicating a medium severity level. The vulnerability was reported by [email protected] and is currently tracked in the NVD.

Defensive priority

Medium

Recommended defensive actions

  • Apply the latest patch or update for VK All in One Expansion Unit to version 9.113.4 or later.
  • Restrict access to the affected plugin to only trusted users.
  • Monitor the plugin's logs for suspicious activity.
  • Consider implementing a web application firewall (WAF) to detect and prevent XSS attacks.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record was published on 2026-04-08T09:16:22.970Z and last modified on 2026-07-24T21:10:00.143Z. The NVD entry is currently Deferred. The vulnerability was reported by [email protected]. Evidence is limited to public sources and may not reflect the full scope or impact of the vulnerability. Defenders should verify affected deployments and review official advisories for specific guidance.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-04-08T09:16:22.970Z and has not been modified since then. The NVD entry is currently Deferred.