CVE-2023-2288: Otter - Gutenberg Blocks < 2.2.6 - Author+ PHAR Deserialization

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 18.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-05-30 · updated 2026-10-24
Weakness: CWE-502

Description

The Otter WordPress plugin before 2.2.6 does not sanitize some user-controlled file paths before performing file operations on them. This leads to a PHAR deserialization vulnerability on PHP < 8.0 using the phar:// stream wrapper.

Affected products

Otter: before 2.2.6 — fixed in 2.2.6

How to fix

Upgrade to a fixed version: Otter 2.2.6. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/93acb4ee-1053-48e1-8b69-c09dc3b2f302
https://wpscan.com/vulnerability/93acb4ee-1053-48e1-8b69-c09dc3b2f302

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