53/100 CVSS 6.5 💀 ZERO-DAYPublished: May 26, 2026

SSRF in Anthropic mcp-server-fetch and Microsoft playwright-mcp — publicly disclosed via GitHub issues

Posted by outreach on May 25-----BEGIN SECURITY ADVISORY----- Title: Server-Side Request Forgery (SSRF) in Anthropic mcp-server-fetch and Microsoft playwright-mcp Author: Syed Anas Mohiuddin &lt;anasmohiuddinsyed () gmail com&gt; Date: May 25, 2026 CVSS: 7.5 (HIGH) — AV:N...

6.5

CVSS Score

MEDIUM

Threat Level

Priority /100

TBD

Exploited ITW

Monitor

CISA Status

Sources

🔵

HIGH-PRIORITY SECURITY ADVISORY — Priority Score: 53/100

CVSS 6.5 MEDIUM. SENTINEL APEX recommends immediate patch evaluation. Intelligence from 1 confirmed source(s).

📋 Executive Summary

⚡ Analyst Assessment — SENTINEL APEX v4.0

CYBERDUDEBIVASH SENTINEL APEX has confirmed a MEDIUM-tier threat intelligence signal for FULLDIS-edc603ed53211968 affecting SecLists Multiple Targets. Composite threat score: 53/100. Intelligence corroborated across 1 source(s): fulldisclosure. CVSS base score: 6.5. Exploitation probability assessed as HIGH based on vulnerability characteristics.

Intelligence sources: fulldisclosure

⚠️ Business Impact Analysis

⚠️ SecLists Multiple Targets users face material security risk requiring immediate remediation

🔗 Attack Chain Analysis

Step-by-step attack chain based on observed TTPs and vulnerability characteristics:

#	Phase	Attacker Action	MITRE
1	Reconnaissance	Attacker identifies exposed Multiple Targets instances via Shodan, Censys, or targeted scanning	`TA0043`
2	Initial Access	Exploitation of FULLDIS-edc603ed53211968 in SecLists Multiple Targets	`T1190`
3	Persistence	Backdoor, scheduled task, or new admin account created for persistent access	`T1053`
4	Command & Control	Attacker establishes persistent C2 channel using HTTPS or DNS tunneling	`T1071`
5	Impact / Objectives	Intellectual property theft, espionage, cryptomining, or preparation for future attack stage	`T1657`

⚠ Deep Dive Analysis

This zero-day vulnerability is being actively exploited before a vendor patch is available. SENTINEL APEX intelligence shows unpatched vulnerabilities are consistently weaponized within 24-72 hours of public disclosure. Nation-state APT groups and ransomware operators actively monitor disclosures and race to weaponize.

SENTINEL APEX URGENCY: ELEVATED. Score: 53/100 MEDIUM. Patch before exploitation activity begins.

🎯 MITRE ATT&CK Mapping

Category	Mapping
Primary Tactic	Collection
Primary Technique	T1213 — Data from Information Repositories
Sub-Technique	T1190 — Exploit Public-Facing Application
Weakness (CWE)	See NVD entry
Intel Type	💀 ZERO-DAY
Source(s)	fulldisclosure

🔍 Detection Rules — Sigma (SIEM)

Deploy to Splunk, Elastic, Microsoft Sentinel, or QRadar. SOC Pro subscribers receive pre-compiled SIEM-native query packs updated with each pipeline run.

Sigma YAMLtitle: FULLDIS-edc603ed53211968 Exploitation Attempt — SecLists Multiple Targets
id: 30618ef2f225a423-5af3
status: experimental
description: Detects exploitation of FULLDIS-edc603ed53211968 in SecLists Multiple Targets. Priority: MEDIUM. Score: 53/100
author: CYBERDUDEBIVASH SENTINEL APEX v4.0 (bivash@cyberdudebivash.com)
date: 2026-05-26
references:
    - https://nvd.nist.gov/vuln/detail/FULLDIS-edc603ed53211968
    - https://blog.cyberdudebivash.in/
tags:
    - attack.initial_access
    - attack.t1190
logsource:
    category: webserver
detection:
    keywords:
        - 'fulldis-edc603ed53211968'
    condition: keywords
falsepositives:
    - Security scanners
level: medium

📡 Detection Rules — YARA (Endpoint)

Deploy to endpoint detection platforms. Enterprise subscribers receive tuned, FP-validated YARA rule packs.

YARArule FULLDIS_edc603ed53211968_Exploitation {
    meta:
        description = "Detects artifacts related to FULLDIS-edc603ed53211968 exploitation in SecLists Multiple Targets"
        author      = "CYBERDUDEBIVASH SENTINEL APEX v4.0"
        date        = "2026-05-26"
        severity    = "HIGH"
        cvss        = "6.5"
        priority    = "53/100"
        threat_level = "MEDIUM"
        reference   = "https://nvd.nist.gov/vuln/detail/FULLDIS-edc603ed53211968"
    strings:
        $id_str  = "FULLDIS-edc603ed53211968" ascii nocase
        $product = "Multiple_Targets" ascii nocase wide
    condition:
        any of them
}

🛡️ SOC Response Playbook

1IMMEDIATE (0-1hr): Identify all instances of Multiple Targets in your environment via CMDB/asset inventory
2IMMEDIATE (0-1hr): Apply vendor patch — no maintenance window exception for MEDIUM threats
3IMMEDIATE (1-2hr): If no patch available: implement WAF rules, ACLs, or network-level compensating controls
4SHORT-TERM (2-4hr): Deploy Sigma detection rule to SIEM — validate alert generation in test environment
5SHORT-TERM (4-8hr): Review logs for exploitation indicators (anomalous Multiple Targets requests, error spikes)
6SHORT-TERM (8-24hr): Hunt for post-exploitation: new admin accounts, scheduled tasks, lateral movement
7MONITOR: Subscribe to SecLists security advisories for patch updates
8ONGOING: Track SENTINEL APEX intelligence feed for follow-on campaigns targeting Multiple Targets

📎 Intelligence References

seclists.org/fulldisclosure/2026/May/22

SENTINEL INTEL BRIEF

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⚡ CYBERDUDEBIVASH SENTINEL APEX v4.0

Intelligence report generated by CYBERDUDEBIVASH SENTINEL APEX v4.0
Report ID: SENTINEL-FULLDIS-edc603ed53211968-2026-05-26 | Priority: 53/100 MEDIUM | Sources: 1
© 2026 CYBERDUDEBIVASH PRIVATE LIMITED
Republication requires written attribution to CYBERDUDEBIVASH SENTINEL APEX

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