CVE-2026-5427Disclosure

LOWCVSS 5.3 · MEDIUM

Exploit discussion active in current signal (3 latest mentions)

Immediate actions

  • Hunt for exploitation attempts and persistence artifacts
  • Increase monitoring for publicly documented tradecraft
  • Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

NVD description

The Kubio plugin for WordPress is vulnerable to Arbitrary File Upload in versions up to and including 2.7.2. This is due to insufficient capability checks in the kubio_rest_pre_insert_import_assets() function, which is hooked to the rest_pre_insert_{post_type} filter for posts, pages, templates, and template parts. When a post is created or updated via the REST API, Kubio parses block attributes looking for URLs in the 'kubio' attribute namespace and automatically imports them via importRemoteFile() without verifying the user has the upload_files capability. This makes it possible for authenticated attackers with Contributor-level access and above to bypass WordPress's normal media upload restrictions and upload files fetched from external URLs to the media library, creating attachment posts in the database.

1.5/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-862

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

NONE

Threat summary

  • Public PoC is present in monitored signal
  • 3 mentions across 1 observed day

What's happening

  • PoC mentioned or linked in 1 signal
  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • 3 total mentions across 1 day

Deep dive

Activity timeline3 mentions / 1d
01223Mentions · 2026-04-17: 3PoC Mentioned / Linked · 2026-04-17: 1Technical Details · 2026-04-17: 204-17
Signal classification2 categories
Disclosure
266.7%
PoC
133.3%
Referenced assets3 URLs
Full discourse3 posts
  • Atomic Edge@atomicedgeWAF
    PoC

    https://atomicedge.io/cve-proof/cve-2026-5427-kubio-version-2-7-2-medium-vulnerability-proof-of-concept CVE-2026-5427 #WordPress plugin #vulnerability kubio #cybersecurity #wordpressfirewall #wordpresssecurity #hacking #wpsecurity #atomicedge

    Post summary

    A proof of concept for CVE‑2026‑5427, affecting Kubio plugin version 2.7.2, is posted by Atom Ice Edge, underscoring a medium‑severity vulnerability.

    0000054
    7 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-5427 The Kubio plugin for WordPress is vulnerable to Arbitrary File Upload in versions up to and including 2.7.2. This is due to insufficient capability checks in the kubio_… https://www.cve.org/CVERecord?id=CVE-2026-5427

    Post summary

    The message announces CVE‑2026‑5427, stating that the Kubio plugin for WordPress allows arbitrary file upload due to missing capability checks, but provides no PoC, exploit, or mitigation.

    0000064
    57.2K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-5427 Arbitrary File Upload in Kubio Plugin for WordPress Versions Up to 2.7.2 https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-5427

    Post summary

    The entry announces CVE-2026-5427, describing an arbitrary file upload flaw in Kubio Plugin for WordPress versions up to 2.7.2, without mentioning PoC, exploit, or patch information.

    0000034
    4.0K followersView on X

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