⚡ ACTIVELY EXPLOITED 80/100 CVSS 8 💀 ZERO-DAYPublished: July 2, 2026

[fulldis] CVE-2026-58451 - Horde Groupware IMP path traversal vuln

Posted by ㅤevan via Fulldisclosure on Jul 02this is my first time sending to a mailing list so ive chosen something easy. here goes: Summary: Horde Groupware’s IMP Webmail solution contains a path traversal/local file inclusion vulnerability which could be exploited to escalate p...

CVSS Score

HIGH

Threat Level

Priority /100

YES

Exploited ITW

Monitor

CISA Status

Sources

⚠️

ACTIVE EXPLOITATION DETECTED

Exploitation confirmed in the wild. Emergency patching required. Score: 80/100 — do not wait for maintenance window.

📋 Executive Summary

⚡ Analyst Assessment — SENTINEL APEX v4.0

CYBERDUDEBIVASH SENTINEL APEX has confirmed a HIGH-tier threat intelligence signal for CVE-2026-58451 affecting SecLists Multiple Targets. Composite threat score: 80/100. Intelligence corroborated across 1 source(s): fulldisclosure. CVSS base score: 8. Active exploitation detected in the wild — emergency response required.

Intelligence sources: fulldisclosure

⚠️ Business Impact Analysis

⚠️ Threat actors actively targeting this vulnerability — attack window is open now
⚠️ Privilege escalation — local attacker can become SYSTEM/root
⚠️ Authentication bypass — all access controls circumvented

🔗 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	Unauthenticated exploitation — no credentials required. Single HTTP request sufficient	`T1190`
3	Privilege Escalation	Local privilege escalation to SYSTEM/root for full control	`T1068`
4	Persistence	Backdoor, scheduled task, or new admin account created for persistent access	`T1053`
5	Command & Control	Attacker establishes persistent C2 channel using HTTPS or DNS tunneling	`T1071`
6	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: HIGH. Score: 80/100 HIGH. Active exploitation confirmed — treat as active incident requiring immediate response.

🎯 MITRE ATT&CK Mapping

Category	Mapping
Primary Tactic	Initial Access
Primary Technique	T1190 — Exploit Public-Facing Application
Sub-Technique	T1078 — Valid Accounts
Weakness (CWE)	See NVD entry
Intel Type	💀 ZERO-DAY
Source(s)	fulldisclosure

🔴 CVE Reference

CVE ID	Reference	Score
CVE-2026-58451	NVD →	8

🔍 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: CVE-2026-58451 Exploitation Attempt — SecLists Multiple Targets
id: 2d0c00645032f0b1-9d57
status: experimental
description: Detects exploitation of CVE-2026-58451 in SecLists Multiple Targets. Priority: HIGH. Score: 80/100
author: CYBERDUDEBIVASH SENTINEL APEX v4.0 (bivash@cyberdudebivash.com)
date: 2026-07-02
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2026-58451
    - https://blog.cyberdudebivash.in/
tags:
    - attack.initial_access
    - attack.t1190
    - cve-2026-58451
logsource:
    category: webserver
detection:
    keywords:
        - 'CVE-2026-58451'
        - 'cve-2026-58451'
    condition: keywords
falsepositives:
    - Security scanners
level: high

📡 Detection Rules — YARA (Endpoint)

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

YARArule CVE_2026_58451_Exploitation {
    meta:
        description = "Detects artifacts related to CVE-2026-58451 exploitation in SecLists Multiple Targets"
        author      = "CYBERDUDEBIVASH SENTINEL APEX v4.0"
        date        = "2026-07-02"
        severity    = "HIGH"
        cvss        = "8"
        priority    = "80/100"
        threat_level = "HIGH"
        reference   = "https://nvd.nist.gov/vuln/detail/CVE-2026-58451"
    strings:
        $id_str  = "CVE-2026-58451" 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 HIGH 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

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Related Resources — SENTINEL APEX

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⚡ CYBERDUDEBIVASH SENTINEL APEX v4.0

Intelligence report generated by CYBERDUDEBIVASH SENTINEL APEX v4.0
Report ID: SENTINEL-CVE-2026-58451-2026-07-02 | Priority: 80/100 HIGH | Sources: 1
© 2026 CYBERDUDEBIVASH PRIVATE LIMITED
Republication requires written attribution to CYBERDUDEBIVASH SENTINEL APEX

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