VulnSocial

CVE-2026-8365Disclosure

LOWCVSS 8.8 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

The Blocksy theme for WordPress is vulnerable to PHP Object Injection leading to Remote Code Execution via the 'blocksy_meta' REST API field and the V200 database migration in versions up to and including 2.1.35. This is due to insufficient input sanitization in the blocksy_sanitize_post_meta_options() function, which only blocks values containing '<' or '>' and does not prevent serialized PHP object strings from being stored in post meta, combined with the SearchReplacer::run_recursively() function unconditionally deserializing all string values via @unserialize() during migration without restricting allowed classes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject a serialized Blocksy\RaiiPattern object into post meta that, when the V200 migration runs on an upgraded site, is deserialized and triggers RaiiPattern::__destruct(), which executes arbitrary PHP callables via call_user_func().

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0.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-502

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

  • Patch or workaround signal is available
  • 4 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 4 signals
  • Disclosure: 2 classified signals
  • General: 1 classified signal
  • Peaked 1d ago at 3 mentions (2026-06-09); latest day: 1
  • 4 total mentions across 2 days

Deep dive

Activity timeline4 mentions / 2d
01223Mentions · 2026-06-09: 3Mentions · 2026-06-10: 1Patch / Workaround · 2026-06-10: 1Technical Details · 2026-06-09: 3Technical Details · 2026-06-10: 106-0906-10
Signal classification3 categories
Disclosure
250.0%
General
125.0%
Patch
125.0%
Referenced assets5 URLs
Classification over time
DateTotalLabels
2026-06-093
Disclosure2General1
2026-06-101
Patch1
Full discourse4 posts
  • Tatyabala emmanuel@etatyabala
    Patch

    Critical Alert: Blocksy WordPress Theme RCE Vulnerability (CVE-2026-8365) Authenticated attackers with just Contributor access can take full control of your website via PHP Object Injection. Affected: Versions 2.1.41 and below Fixed in: 2.1.42 https://wpsecurestack.com/

    Post summary

    Blocksy WordPress Theme RCE vulnerability (CVE-2026-8365) allows authenticated contributors to gain full control via PHP Object Injection; patched in version 2.1.42.

    0000055
    1.1K followersView on X
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* CVE-2026-8365 The Blocksy theme for WordPress is vulnerable to PHP Object Injection leading to Remote Code Execution via the 'blocksy_meta' REST API field and the V200 database migra… https://www.cve.org/CVERecord?id=CVE-2026-8365 ----- Traducción: CVE-2026-8365 El … http://infoflow.cloud`

    Post summary

    The tweet discloses CVE‑2026‑8365, a PHP Object Injection flaw in the Blocksy WordPress theme that allows RCE via the blocksy_meta REST API field; no exploit code, patch, or active exploitation details are provided.

    0000028
    79 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-8365 The Blocksy theme for WordPress is vulnerable to PHP Object Injection leading to Remote Code Execution via the 'blocksy_meta' REST API field and the V200 database migra… https://www.cve.org/CVERecord?id=CVE-2026-8365

    Post summary

    The advisory discloses a PHP Object Injection flaw in the Blocksy WordPress theme that can lead to remote code execution via the blocksy_meta REST API field and the V200 database migration.

    00000160
    57.6K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    General

    CVE-2026-8365 PHP Object Injection Remote Code Execution in Blocksy WordPress Th... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-8365 Vulnerability Alert Subscriptions: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=1

    Post summary

    The tweet merely announces CVE-2026-8365, describing it as a PHP Object Injection RCE in the Blocksy WordPress theme and provides a link to a vulnerability alert page.

    0000044
    4.0K followersView on X

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