What is the CVSS score of CVE-2026-40755?

CVE-2026-40755 has a CVSS 3.1 base score of 8.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.3%.

Which versions of TechLink Theme are affected by CVE-2026-40755?

The Mikado-Themes TechLink WordPress theme (versions 1.3 and earlier) enables unauthenticated attackers to completely compromise WordPress sites through PHP object injection, with no vendor patch…

How to fix or mitigate CVE-2026-40755?

Within 24 hours: Audit all WordPress installations for Mikado-Themes TechLink version 1.3 or earlier; immediately deactivate and uninstall affected theme from all sites. Within 7 days: Migrate all affected WordPress sites to alternative approved themes; conduct security assessment of migrated sites before production restoration. Within 30 days: Implement WordPress plugin and theme vulnerability scanning; establish patch management SLA; audit all custom WordPress theme code for similar object injection vulnerabilities.

TechLink Theme CVE-2026-40755

EUVD-2026-37489 HIGH

Deserialization of Untrusted Data (CWE-502)

2026-06-16 Patchstack

PHP Deserialization Techlink

8.1

CVSS 3.1 · Vendor: Patchstack

Severity by source

Vendor (Patchstack) PRIMARY

8.1 HIGH

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

vuln.today AI

8.1 HIGH

Unauthenticated network-reachable PHP Object Injection yielding full host impact, but AC:H reflects the need for a viable gadget chain in the deployed PHP class graph.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (Patchstack).

CVSS VectorVendor: Patchstack

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Jun 16, 2026 - 23:30 vuln.today

DescriptionCVE.org

Unauthenticated PHP Object Injection in TechLink <= 1.3 versions.

AnalysisAI

Unauthenticated PHP Object Injection in the Mikado-Themes TechLink WordPress theme (versions up to and including 1.3) allows remote attackers to trigger insecure deserialization of attacker-controlled data. Successful exploitation can lead to full compromise of the underlying WordPress site, including arbitrary code execution, data theft, and site defacement, though the CVSS vector flags high attack complexity (AC:H). No public exploit identified at time of analysis, and the issue is not currently listed in CISA KEV.

Technical ContextAI

The vulnerability is rooted in CWE-502 (Deserialization of Untrusted Data), specifically PHP Object Injection. PHP's unserialize() function reconstructs objects from a serialized string and automatically invokes magic methods such as __wakeup(), __destruct(), and __toString(). When attacker-controlled input reaches unserialize(), an adversary can craft a serialized payload that instantiates existing classes (a 'POP chain' / property-oriented programming gadget) loaded in the WordPress runtime - including core, theme, and plugin classes - to achieve arbitrary file operations, SQL injection, or remote code execution. The affected component per CPE is cpe:2.3:a:mikado-themes:techlink, a commercial WordPress theme, meaning every site running TechLink ≤ 1.3 inherits the unsafe deserialization sink reachable without authentication.

RemediationAI

No vendor-released patch identified at time of analysis - the input data does not name a fixed TechLink version, only that ≤ 1.3 is vulnerable. Site operators should monitor the Mikado-Themes vendor site and the Patchstack advisory (https://patchstack.com/database/wordpress/theme/techlink/vulnerability/wordpress-techlink-theme-1-3-php-object-injection-vulnerability) for a patched release and upgrade as soon as one is available. In the interim, deploy a WordPress WAF rule (Patchstack, Wordfence, or equivalent) to block requests containing serialized PHP payload markers (e.g., parameter values beginning with 'O:' or 'a:' followed by a digit and colon) on TechLink theme endpoints; this can break legitimate functionality that relies on serialized input so test before enforcing. If the theme is not business-critical, switch to a different theme until a fix is released, or restrict the vulnerable endpoint via .htaccess/Nginx allow-listing to authenticated admin IPs only, accepting that public-facing features served by that endpoint will be unavailable.