Otter - Gutenberg Blocks <= 2.2.5 - Authenticated (Author+) PHAR Deserialization

8.8
Deserialization of Untrusted Data
CVE CVE-2023-2288
CVSS 8.8 (High)
Publicly Published May 2, 2023
Last Updated January 22, 2024
Researcher Alex Sanford

Description

The Otter - Gutenberg Blocks plugin for WordPress is vulnerable to deserialization of untrusted input via the 'fallback' parameter in versions up to, and including 1.2.7. This makes it possible for authenticated attackers with author privileges to call files using a PHAR wrapper that will deserialize and call arbitrary PHP Objects that can be used to perform a variety of malicious actions granted a POP chain is also present. It also requires that the attacker is successful in uploading a file with the serialized payload.

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Vulnerability Details for Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE

Software Type Plugin
Software Slug otter-blocks (view on wordpress.org)
Patched? Yes
Remediation Update to version 2.2.6, or a newer patched version
Affected Version
  • <= 2.2.5
Patched Version
  • 2.2.6

Recent vulnerabilities in Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE

# Title CVE ID CVSS Researchers Date
1 Otter Blocks <= 3.1.4 - Improper Authorization to Unauthenticated Purchase Verification Bypass via Forged Cookie CVE-2026-2892 7.5 Drew Webber (mcdruid) April 29, 2026
2 Otter - Gutenberg Block <= 3.1.0 - Unauthenticated Sensitive Information Exposure CVE-2025-55715 5.3 Abu Hurayra (HurayraIIT) August 27, 2025
3 Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE <= 3.0.6 - Unauthetnicated Path Traversal to Arbitrary Image View CVE-2024-11219 5.3 mikemyers November 26, 2024
4 Otter - Gutenberg Block <= 3.0.3 - Missing Authorization CVE-2024-51671 4.3 Rafie Muhammad November 1, 2024
5 Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE <= 3.0.4 - Authenticated (Author+) Stored Cross-Site Scripting via SVG File Upload CVE-2024-10367 6.4 Francesco Carlucci October 31, 2024
6 Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE <= 2.6.9 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'titleTag' CVE-2024-3725 6.4 Ngô Thiên An (ancorn_) April 16, 2024
7 Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE <= 2.6.8 - Authenticated (Contributor+) Stored Cross-Site Scripting via Block Attributes CVE-2024-3343 6.4 Ngô Thiên An (ancorn_) April 10, 2024
8 Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE <= 2.6.8 - Authenticated (Author+) Limited File Upload to Stored Cross-Site Scripting CVE-2024-3344 6.4 João Pedro Soares de Alcântara April 10, 2024
9 Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE <= 2.6.5 - Authenticated (Contributor+) Stored Cross-Site Scripting CVE-2024-2841 6.4 Ngô Thiên An (ancorn_) March 28, 2024
10 Otter Blocks <= 2.6.5 - Authenticated (Contributor+) Stored Cross-Site Scripting CVE-2024-2729 6.4 Dmitrii Ignatyev March 28, 2024

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