CVE-2026-56877 - Skillable SCORM userId authorisation bypass

<p>Posted by Greg via Fulldisclosure on Jul 15</p>Skillable's SCORM lab launch endpoint validates a launch token but<br> enforces per-user allocation limits using a browser-supplied userId<br> that is not bound to the validated token. An authenticated learner<br> can modify this identifier to bypass configured...

📋 Executive Summary

⚠️ Business Impact Analysis

• ⚠️ Remote code execution — full server takeover without authentication possible

🔗 Representative Attack Path

A typical attack path for this vulnerability class, mapped to MITRE ATT&CK. This is a representative model to guide detection and defense — not a claim of observed activity against a specific target. Confirm specifics against the primary sources below.

⚠ 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: 60/100 MEDIUM. Patch before exploitation activity begins.

🧠 Structured Intelligence Assessment

SENTINEL APEX analytical tradecraft separates verified fact from labeled assessment and states intelligence gaps explicitly. Confidence reflects evidentiary support, not certainty.

✔ Verified Facts

• Affected CVE(s): CVE-2026-56877.
• Affected technology: SecLists Multiple Targets.
• CVSS base score of 8 assigned by an authoritative source.

🕸️ Correlated Observations

• Vendor SecLists has been targeted in 5 prior CYBERDUDEBIVASH reports (recurring target)
• Product Multiple Targets has been targeted in 5 prior CYBERDUDEBIVASH reports (recurring target)
• Related prior intelligence: cve-2026-53582-seclists-multiple-targets (2 shared entities), schutzwerk-sa-2025-001-authentication-bypass-for-safeline-s (2 shared entities), revive-sa-2026-003-revive-adserver-vulnerabilities (2 shared entities), subject-advisory-submission-ez-game-booster-cleartext-st (2 shared entities), cve-2026-0001-seclists-multiple-targets (2 shared entities)

🧩 Analyst Assessments

• MEDIUM CONF Technical severity is assessed as high (CVSS 8); realized business impact depends on asset exposure and data classification.

❓ Intelligence Gaps

• No confirmed public IOCs are available at report time; detection currently relies on behavioral analytics.
• In-the-wild exploitation is unconfirmed as of this report.
• Attribution to a specific threat actor is not established by the available evidence.
• The source lacks sufficient technical detail for confident MITRE ATT&CK mapping.

🔮 Forward Outlook

• MEDIUM CONF Given the repeated targeting pattern, further activity against this vendor/sector is probable.

🧬 Prior Intelligence Context

This report is correlated against CYBERDUDEBIVASH SENTINEL APEX's persistent analyst memory. The following entities have been tracked in prior intelligence:

• Vendor SecLists — previously observed 5 times in CYBERDUDEBIVASH intelligence since 2026-07-07 (recent: subject-advisory-submission-ez-game-booster-cleartext-st, cve-2026-0001-seclists-multiple-targets)
• Product Multiple Targets — previously observed 5 times in CYBERDUDEBIVASH intelligence since 2026-07-07 (recent: subject-advisory-submission-ez-game-booster-cleartext-st, cve-2026-0001-seclists-multiple-targets)

🎯 MITRE ATT&CK Mapping

🔴 CVE Reference

🔍 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.

📡 Detection Rules — YARA (Endpoint)

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

🎯 Multi-Audience Intelligence Products

This single analysis is packaged for every stakeholder — from the boardroom to the SOC — plus a machine-readable feed for API and MSSP integration. Enterprise & SOC Pro subscribers receive these as structured deliverables.

🏛 Executive Advisory — CISO / Security Leadership

• Affected CVE(s): CVE-2026-56877.
• Affected technology: SecLists Multiple Targets.
• CVSS base score of 8 assigned by an authoritative source.

📋 Board Brief

• A high-severity cyber threat affects SecLists Multiple Targets.
• Technical severity is rated 8/10.
• Primary exposure is operational disruption, data loss, and potential regulatory liability (e.g. GDPR, NIS2, DORA, SOC 2) where in-scope systems are affected.
• Mitigation depends on vendor guidance and compensating controls.
• Recommended posture: authorize prioritized remediation and confirm detection coverage with the security team.

🛡 SOC Bulletin

Severity HIGH · Detection coverage: 0 technique(s) across behavioral analytics · 0 network rule(s)

• P1: Sweep 14 days of telemetry for the mapped ATT&CK techniques.
• P2: Update threat-intel platform and downstream detection feeds with confirmed indicators.

🛡️ 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/Jul/20
• 📌 NVD — CVE-2026-56877