What is the CVSS score of CVE-2026-57770?

CVE-2026-57770 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.6%.

Which versions of Grand Photography are affected by CVE-2026-57770?

The ThemeGoods Grand Photography WordPress theme (versions through 5.7.8) contains a critical PHP object injection vulnerability allowing unauthenticated attackers to achieve remote code execution on…

How to fix or mitigate CVE-2026-57770?

Within 24 hours, conduct a complete inventory of WordPress installations to identify all instances of ThemeGoods Grand Photography theme version 5.7.8 or earlier and disable the theme immediately as a temporary mitigation measure. Within 7 days, contact ThemeGoods for an official patch timeline, evaluate alternative WordPress themes with established security track records, and deploy Web Application Firewall rules to block PHP object injection attack patterns targeting theme files. Within 30 days, complete migration to a replacement theme with active security maintenance, or if operational constraints require continued use, implement comprehensive WAF and IDS monitoring, establish input/output encoding standards across all custom code, and document a detailed incident response plan for potential exploitation scenarios.

Grand Photography CVE-2026-57770

EUVD-2026-43390 CRITICAL

Deserialization of Untrusted Data (CWE-502)

2026-07-13 Patchstack

WordPress Deserialization Grand Photography Wordpress Theme Themegoods

9.8

CVSS 3.1 · Vendor: Patchstack

Severity by source

Vendor (Patchstack) PRIMARY

9.8 CRITICAL

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

vuln.today AI

9.8 CRITICAL

Unauthenticated network-reachable unserialize sink (AV:N/AC:L/PR:N/UI:N); worst-case gadget-driven RCE justifies C:H/I:H/A:H, though real impact depends on available POP chains.

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

4.0 AV:N/AC:L/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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Jul 13, 2026 - 10:37 vuln.today

CVE Published

Jul 13, 2026 - 08:41 cve.org

CRITICAL 9.8

DescriptionCVE.org

Deserialization of Untrusted Data vulnerability in ThemeGoods Grand Photography grandphotography allows Object Injection.This issue affects Grand Photography: from n/a through <= 5.7.8.

AnalysisAI

PHP Object Injection in the ThemeGoods Grand Photography WordPress theme (all versions up to and including 5.7.8) lets remote attackers deliver crafted serialized data to an unsafe unserialize() sink, potentially achieving code execution, file operations, or SQL injection through POP gadget chains. The CVSS 9.8 rating reflects unauthenticated network exploitation (PR:N/UI:N) with full confidentiality, integrity, and availability impact. No public exploit identified at time of analysis, and it is not listed in CISA KEV.

Technical ContextAI

Grand Photography is a commercial WordPress theme sold by ThemeGoods for photography and portfolio sites. The flaw is CWE-502 (Deserialization of Untrusted Data): PHP code passes attacker-controllable input into unserialize() without validation, allowing an attacker to instantiate arbitrary PHP objects. On its own object injection is inert, but WordPress and its bundled libraries expose 'POP gadget' chains (magic methods such as __wakeup/__destruct) that can be reached during unserialization to escalate into file deletion, arbitrary file writes, SQL injection, or remote code execution. The CPE cpe:2.3:a:themegoods:grand_photography:*:*:*:*:*:*:*:* confirms the affected component is the theme itself rather than WordPress core.

RemediationAI

No fixed version is stated in the available data (affected range is 'n/a through <= 5.7.8'), so no vendor-released patch is confirmed at time of analysis; monitor ThemeGoods and the Patchstack advisory (https://patchstack.com/database/Wordpress/Theme/grandphotography/vulnerability/wordpress-grand-photography-theme-5-7-8-php-object-injection-vulnerability) for a release above 5.7.8 and upgrade as soon as one is published. As compensating controls until then, deploy a WordPress WAF or Patchstack virtual patching to block serialized-object payloads reaching the theme's endpoints, restrict or disable the specific theme functionality that accepts user input where feasible (accepting possible loss of that feature), and audit the site for other plugins that expose POP gadget chains to reduce the impact of any object injection. Standard hardening - least-privilege database accounts and file-system permissions that limit web-server write access - reduces the blast radius of gadget-driven file or SQL operations.