57/100 CVSS 6.5 💀 ZERO-DAYPublished: May 17, 2026

Full disclosure: Impersonation attacks on Edupage portal

Posted by Juraj Kosik on May 17VULNERABILITY Non-sanitised submission of malicious SVG files on the Edupage portal in combination with CSRF vulnerability allows triggering various actions on behalf of other users, e.g. identity spoofing, sending fake messages, giving fake approvals, etc.&lt...

6.5

CVSS Score

MEDIUM

Threat Level

Priority /100

TBD

Exploited ITW

Monitor

CISA Status

Sources

🔵

HIGH-PRIORITY SECURITY ADVISORY — Priority Score: 57/100

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-11e745246820c12a affecting SecLists Multiple Targets. Composite threat score: 57/100. 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-11e745246820c12a 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: 57/100 MEDIUM. Patch before exploitation activity begins.

🎯 MITRE ATT&CK Mapping

Category	Mapping
Primary Tactic	Initial Access
Primary Technique	T1190 — Exploit Public-Facing Application
Sub-Technique	T1203 — Exploitation for Client Execution
Weakness (CWE)	See NVD entry
Intel Type	💀 ZERO-DAY
Source(s)	fulldisclosure

🏷️ Indicators of Compromise — Enriched IOC Feed

Normalized IOCs with confidence scoring. Block immediately across all enforcement points. SOC Pro subscribers receive enriched IOC bundles with full attribution and STIX/TAXII feeds.

Indicator Value	Type	Confidence	First Seen
https://jkosik.github.io/posts/edupage/">https://jkosik.github.io/posts/	url	82%	2026-05-17
https://www.edupage.org/">https://www.edupage.org/</a><br>	url	82%	2026-05-17
jkosik.github.io	domain	75%	2026-05-17
www.edupage.org	domain	75%	2026-05-17

🔍 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-11e745246820c12a Exploitation Attempt — SecLists Multiple Targets
id: 0ee93cb146356e2e-25a9
status: experimental
description: Detects exploitation of FULLDIS-11e745246820c12a in SecLists Multiple Targets. Priority: MEDIUM. Score: 57/100
author: CYBERDUDEBIVASH SENTINEL APEX v4.0 (bivash@cyberdudebivash.com)
date: 2026-05-17
references:
    - https://nvd.nist.gov/vuln/detail/FULLDIS-11e745246820c12a
    - https://blog.cyberdudebivash.in/
tags:
    - attack.initial_access
    - attack.t1190
logsource:
    category: webserver
detection:
    keywords:
        - 'fulldis-11e745246820c12a'
    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_11e745246820c12a_Exploitation {
    meta:
        description = "Detects artifacts related to FULLDIS-11e745246820c12a exploitation in SecLists Multiple Targets"
        author      = "CYBERDUDEBIVASH SENTINEL APEX v4.0"
        date        = "2026-05-17"
        severity    = "HIGH"
        cvss        = "6.5"
        priority    = "57/100"
        threat_level = "MEDIUM"
        reference   = "https://nvd.nist.gov/vuln/detail/FULLDIS-11e745246820c12a"
    strings:
        $id_str  = "FULLDIS-11e745246820c12a" 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: Block all 4 IOCs in this report at firewall, proxy, DNS, and EDR simultaneously
3IMMEDIATE (0-1hr): Apply vendor patch — no maintenance window exception for MEDIUM threats
4IMMEDIATE (1-2hr): If no patch available: implement WAF rules, ACLs, or network-level compensating controls
5SHORT-TERM (2-4hr): Deploy Sigma detection rule to SIEM — validate alert generation in test environment
6SHORT-TERM (4-8hr): Review logs for exploitation indicators (anomalous Multiple Targets requests, error spikes)
7SHORT-TERM (8-24hr): Hunt for post-exploitation: new admin accounts, scheduled tasks, lateral movement
8MONITOR: Subscribe to SecLists security advisories for patch updates
9ONGOING: Track SENTINEL APEX intelligence feed for follow-on campaigns targeting Multiple Targets

📎 Intelligence References

seclists.org/fulldisclosure/2026/May/4

SENTINEL INTEL BRIEF — FREE

Get Critical CVE Alerts Before They Become Incidents

Join 10,000+ SOC analysts receiving daily threat intelligence, detection rules & CVE alerts. Free. No spam. Unsubscribe anytime.

Read by 10,000+ security professionals worldwide · Unsubscribe at any time

Related Resources — SENTINEL APEX

🔭 Threat Intelligence Hub 🎯 MITRE ATT&CK Detections 🤖 OWASP LLM Top 10 📦 Detection Pack Store ⚡ SOC Pro Plans 🏢 Enterprise Contact

⚡ CYBERDUDEBIVASH SENTINEL APEX v4.0

Intelligence report generated by CYBERDUDEBIVASH SENTINEL APEX v4.0
Report ID: SENTINEL-FULLDIS-11e745246820c12a-2026-05-17 | Priority: 57/100 MEDIUM | Sources: 1
© 2026 CYBERDUDEBIVASH PRIVATE LIMITED
Republication requires written attribution to CYBERDUDEBIVASH SENTINEL APEX

🏢 ENTERPRISE THREAT INTELLIGENCE PLATFORM

Pre-disclosure intel, enriched IOC bundles, deploy-ready SIEM packs, and dedicated analyst support — before threats become headlines.

⚡ SOC Pro — $18/mo 🏢 Enterprise — Custom Pricing 🔌 Threat Intel API Access 📦 Detection Pack Store

48hr pre-disclosure · Enriched IOC feeds · Custom advisories · White-label reports · Dedicated analyst · MSSP licensing