CVE-2026-0950: Spectra Gutenberg Blocks Info Disclosure

CVE-2026-0950 Overview

The Spectra Gutenberg Blocks – Website Builder for the Block Editor plugin for WordPress contains an Information Disclosure vulnerability in all versions up to and including 2.19.17. The vulnerability exists due to the plugin failing to check post_password_required() before rendering post excerpts in the render_excerpt() function and the uagb_get_excerpt() helper function. This security flaw allows unauthenticated attackers to read excerpts of password-protected posts by simply viewing any page that contains a Spectra Post Grid, Post Masonry, Post Carousel, or Post Timeline block.

Critical Impact

Unauthenticated attackers can bypass password protection mechanisms and access sensitive content excerpts from protected posts, potentially exposing confidential information intended for restricted audiences.

Affected Products

• Spectra Gutenberg Blocks – Website Builder for the Block Editor (WordPress Plugin) versions up to and including 2.19.17
• WordPress sites utilizing Post Grid, Post Masonry, Post Carousel, or Post Timeline blocks from the Spectra plugin
• Ultimate Addons for Gutenberg (plugin slug: ultimate-addons-for-gutenberg)

Discovery Timeline

• 2026-02-03 - CVE-2026-0950 published to NVD
• 2026-02-03 - Last updated in NVD database

Technical Details for CVE-2026-0950

Vulnerability Analysis

This Information Disclosure vulnerability stems from improper access control implementation within the Spectra Gutenberg Blocks plugin. When WordPress content is protected with a password, the post_password_required() function should be called to verify whether the current user has provided the correct password before displaying any content. The Spectra plugin fails to implement this critical check in its excerpt rendering logic, creating an authentication bypass that exposes protected content.

The vulnerability affects multiple block types within the plugin ecosystem, including Post Grid, Post Masonry, Post Carousel, and Post Timeline blocks. Any page containing these blocks will inadvertently leak excerpts from password-protected posts to unauthenticated visitors, completely undermining the intended access control mechanism.

Root Cause

The root cause is a missing authorization check in the render_excerpt() function within class-uagb-post.php and the uagb_get_excerpt() helper function in class-uagb-helper.php. These functions render post excerpts without first verifying if the post requires password authentication via WordPress's built-in post_password_required() function. This oversight allows the excerpt content to be displayed regardless of the post's password protection status.

The vulnerable code paths exist at multiple locations within the plugin:

• UAGB Post Class Line 1303
• UAGB Post Class Line 1621
• UAGB Post Class Line 2196
• UAGB Helper Class Line 1403

Attack Vector

The attack vector is network-based and requires no authentication or user interaction. An attacker can exploit this vulnerability by simply navigating to any public-facing page on a vulnerable WordPress site that contains one of the affected Spectra blocks (Post Grid, Post Masonry, Post Carousel, or Post Timeline). The plugin will automatically render excerpts from all posts matching the block's query parameters, including those protected by passwords.

The exploitation is trivial: an attacker identifies a WordPress site using the Spectra plugin, locates a page with an affected block type, and views the page to observe excerpts from password-protected posts rendered in plain text. No special tools, authentication credentials, or crafted requests are required.

Detection Methods for CVE-2026-0950

Indicators of Compromise

• Unusual access patterns to pages containing Spectra Post Grid, Post Masonry, Post Carousel, or Post Timeline blocks
• Requests from unauthenticated users to pages that aggregate password-protected content
• Evidence of systematic enumeration of pages containing Spectra blocks
• Log entries showing repeated access to archive or blog pages without corresponding password authentication attempts

Detection Strategies

• Review web server access logs for patterns indicating reconnaissance of pages with Spectra blocks
• Monitor for requests to pages containing password-protected post aggregations from unauthenticated sessions
• Implement web application firewall (WAF) rules to alert on suspicious access patterns to WordPress archive pages
• Conduct periodic audits of which pages contain Spectra blocks that display password-protected content

Monitoring Recommendations

• Enable detailed WordPress access logging to track requests to pages with Spectra blocks
• Configure alerting for bulk requests to archive-type pages from single IP addresses
• Monitor plugin version information via WordPress dashboard or automated scanning tools
• Implement SentinelOne Singularity for endpoint-level detection of web application attacks and anomalous behavior patterns

How to Mitigate CVE-2026-0950

Immediate Actions Required

• Update the Spectra Gutenberg Blocks plugin to a version newer than 2.19.17 immediately
• Audit all pages containing Post Grid, Post Masonry, Post Carousel, or Post Timeline blocks
• Review password-protected posts to assess potential information exposure
• Consider temporarily removing affected blocks from public pages until the update is applied

Patch Information

A patch addressing this vulnerability is available in the WordPress plugin repository. The fix implements proper post_password_required() checks before rendering post excerpts. Review the WordPress Changeset Update for technical details on the remediation. Additional vulnerability details are available in the Wordfence Vulnerability Report.

Workarounds

• Remove Spectra Post Grid, Post Masonry, Post Carousel, and Post Timeline blocks from pages that may display password-protected content
• Replace password-protected posts with private posts (which are hidden from non-authenticated users entirely)
• Implement server-level access controls to restrict access to sensitive archive pages
• Use a security plugin to add additional access control layers while awaiting the update

# Configuration example - WordPress CLI command to check plugin version
wp plugin list --name=ultimate-addons-for-gutenberg --format=table

# Update the plugin to the latest version
wp plugin update ultimate-addons-for-gutenberg

# Alternatively, deactivate the plugin temporarily if immediate update is not possible
wp plugin deactivate ultimate-addons-for-gutenberg