Otter Blocks PRO <= 2.6.3 - Unauthenticated Stored Cross-Site Scripting via SVG Upload

Description

The Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE PRO plugin for WordPress is vulnerable to Stored Cross-Site Scripting via file upload form, which allows SVG uploads, in all versions up to, and including, 2.6.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Note that the patch in 2.6.4 allows SVG uploads but the uploaded SVG files are sanitized.

Scores

EPSS (exploitation in 30 days)

0.47% · top 59% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.1.

Weakness

• CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (opens in a new tab)All about CWE-79 and its CVEs

Affected products

• Themisle · Otter Blocks PRO – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE

  • affected ≤ 2.6.3

References (2)

• https://www.wordfence.com/threat-intel/vulnerabilities/id/77838bf8-7809-4dd6-87f1-a9bda40275a6?source=cve (opens in a new tab)x_transferred
• https://store.themeisle.com/?edd_action=view_changelog&name=Otter%20Pro (opens in a new tab)x_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2024-1691](https://trackcve.app/badge/CVE-2024-1691.svg)](https://trackcve.app/cve/CVE-2024-1691)

Record last updated 8 Apr 2026, 17:01 UTC.