CVE-2024-2729: Otter Blocks < 2.6.6 - Contributor+ Stored XSS

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-04-18 · updated 2026-06-17
Weakness: CWE-79

Description

The Otter Blocks WordPress plugin before 2.6.6 does not properly escape its mainHeadings blocks' attribute before appending it to the final rendered block, allowing contributors to conduct Stored XSS attacks.

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://wpscan.com/vulnerability/5014f886-020e-49d1-96a5-2159eed8ba14/
https://wpscan.com/vulnerability/5014f886-020e-49d1-96a5-2159eed8ba14/

Get alerted when CVE-2024-2729 or the next vulnerability affects your stack