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CVE-2026-1242— BlockSpare - Gutenberg Site Builder Blocks & Starter Sites <= 4.2.6 - Incorrect Authorization to Authenticated (Subscriber+) Arbitrary Post Creation

Quick assessment

Affected
blockspare BlockSpare – Gutenberg Blocks for News, Magazine, Blog & Business Websites
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 插件 BlockSpare 存在授权绕过漏洞，该漏洞源于权限回调中的逻辑错误：在所有 4.2.6 及更早版本中，代码错误地使用了 AND 逻辑与（&&）运算符，而非 OR 逻辑或（

CVSS 4.3 · Medium EPSS 0.18% · P8

Affected Version Matrix 1

VendorProduct Version RangeStatus
blockspare BlockSpare – Gutenberg Blocks for News, Magazine, Blog & Business Websites ≤ 4.2.6 affected
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I. Basic Information for CVE-2026-1242

Vulnerability Information
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Vulnerability Title
BlockSpare - Gutenberg Site Builder Blocks & Starter Sites <= 4.2.6 - Incorrect Authorization to Authenticated (Subscriber+) Arbitrary Post Creation
Source: CVE Program / CVE List V5
Vulnerability Description
The BlockSpare plugin for WordPress is vulnerable to authorization bypass due to incorrect logic in the permission callback in all versions up to, and including, 4.2.6 due to the use of an AND (&&) operator instead of an OR (||) operator. This makes it possible for authenticated attackers, with Subscriber-level access and above, to bypass authorization checks and create arbitrary posts.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
blockspare BlockSpare – Gutenberg Blocks for News, Magazine, Blog & Business Websites 0 ~ 4.2.6 -

II. Public POCs for CVE-2026-1242

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-1242

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Security Blog Posts for CVE-2026-1242 (1)

Vendor Pages for CVE-2026-1242 (1)

IV. Related Vulnerabilities

Same vendor: blockspare
Same weakness: CWE-863

V. Comments for CVE-2026-1242

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