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CVE-2023-6486: Spectra – WordPress Gutenberg Blocks <= 2.10.3 - Authenticated(Contributor+) Cross-Site Scripting via Custom CSS

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-04-09 · updated 2026-06-17
• Weakness: CWE-79

Description

The Spectra – WordPress Gutenberg Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Custom CSS metabox in all versions up to and including 2.10.3 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.

Affected products

• Brainstorm Force Spectra: before 2.10.4 — fixed in 2.10.4

How to fix

Upgrade to a fixed version: Brainstorm Force Spectra 2.10.4. Check the vendor advisory for mitigations.

References

• https://advisory.abay.sh/cve-2023-6486
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3042670%40ultimate-addons-for-gutenberg%2Ftrunk&old=3037142%40ultimate-addons-for-gutenberg%2Ftrunk&sfp_email=&sfph_mail=
• https://www.wordfence.com/threat-intel/vulnerabilities/id/d4933a30-974f-487d-9444-b0ea1283a09c?source=cve
• https://youtu.be/t5K745dBsT0
• https://advisory.abay.sh/cve-2023-6486
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3042670%40ultimate-addons-for-gutenberg%2Ftrunk&old=3037142%40ultimate-addons-for-gutenberg%2Ftrunk&sfp_email=&sfph_mail=
• https://www.wordfence.com/threat-intel/vulnerabilities/id/d4933a30-974f-487d-9444-b0ea1283a09c?source=cve
• https://youtu.be/t5K745dBsT0

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