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CVE-2024-2841: Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE <= 2.6.5 - Authenticated (Contributor+) Stored Cross-Site Scripting

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-03-29 · updated 2026-06-17
• Weakness: CWE-79

Description

The Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's widgets in all versions up to, and including, 2.6.5 due to insufficient input sanitization and output escaping on user supplied attributes such as 'id'. 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

• themeisle Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE: before 2.6.6 — fixed in 2.6.6

How to fix

Upgrade to a fixed version: themeisle Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE 2.6.6. Check the vendor advisory for mitigations.

References

• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3059761%40otter-blocks&new=3059761%40otter-blocks&sfp_email=&sfph_mail=
• https://www.wordfence.com/threat-intel/vulnerabilities/id/99e24496-0e3b-4bff-ba14-dc535be10633?source=cve
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3059761%40otter-blocks&new=3059761%40otter-blocks&sfp_email=&sfph_mail=
• https://www.wordfence.com/threat-intel/vulnerabilities/id/99e24496-0e3b-4bff-ba14-dc535be10633?source=cve

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