What is CVE-2026-1646?

CVE-2026-1646 is a medium-severity vulnerability in Iamjaydip Advance Block Extend, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-02-19.

How severe is CVE-2026-1646?

Medium severity. CVSS v3 base score is 6.4 out of 10.

XSS in Iamjaydip Advance Block Extend

CVE-2026-1646

The Advance Block Extend plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the TitleColor block attribute in the Latest Posts Gutenberg block in all versions up to, and including, 1.0.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (13.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

Iamjaydip Advance Block Extend — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-1646?: CVE-2026-1646 is a medium-severity vulnerability in Iamjaydip Advance Block Extend, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-02-19.
How severe is CVE-2026-1646?: Medium severity. CVSS v3 base score is 6.4 out of 10.