CVE-2025-4391Disclosure

LOWCVSS 9.8 · CRITICAL

Exploit discussion active in current signal (1 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 Echo RSS Feed Post Generator plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the echo_generate_featured_image() function in all versions up to, and including, 5.4.8.1. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.

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1.5/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-434

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

NONE

Threat summary

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

What's happening

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

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets1 URL

By indicator

https://zerodaysignal.com/vulnerability/CVE-2025-4391

Full discourse1 post

0day Signal@0dayPublishing183d
Disclosure
🚨 CVE-2025-4391: Echo RSS Feed Post Generator <= 5... Unauthenticated file upload in WordPress plugin with zero validation = instant webshell deployment and full server compr... https://zerodaysignal.com/vulnerability/CVE-2025-4391 #netsec #vulnerability #CVE #sysadmin #zeroday
Post summary
The tweet announces CVE-2025-4391, a WordPress plugin flaw that permits unauthenticated file uploads and can result in webshell deployment. No exploit code, patch, or evidence of active exploitation is provided.
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204 followersView on X

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