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    3 vulnerabilities by Skillable

    GCVE-1988-2026-0352

    Vulnerability from gna-1988 – Published: 2026-09-11 07:55 – Updated: 2026-09-11 07:55
    VLAI
    Title
    CVE-2026-56877 - Skillable SCORM userId authorisation bypass
    Summary
    Skillable's SCORM lab launch endpoint validates a launch token but enforces per-user allocation limits using a browser-supplied userId that is not bound to the validated token. An authenticated learner can modify this identifier to bypass configured limits, launch concurrent lab instances, and consume another learner's allocation. Skillable states that no fix is planned for the legacy SCORM launch path. CVE-2026-56877 was assigned by MITRE. 1. Advisory information ----------------------- Title: CVE-2026-56877 - Skillable SCORM userId authorisation bypass Advisory: https://github.com/GregDurys/security-advisories/tree/main/skillable CVE: CVE-2026-56877 (assigned; record publication pending) Class: CWE-639 (Authorization Bypass Through User-Controlled Key) CVSS: 6.5 (Medium) - AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Date: 2026-07-12 Author: Greg Durys <https://payloadforge.io> 2. Affected software -------------------- Vendor: Skillable (formerly Learn on Demand Systems) Service: Hosted SCORM lab provisioning (cloud service, no on-premises deployment) Endpoint: scorm.skillable.com/scorm/launch Tested: 2026-04-28 to 2026-05-03 (production endpoint, via the Red Team Ops course on the Zero Point Security platform) Fix: None. The vendor states that no server-side identity validation will be added to the SCORM launch path. Remediation is migration to an API or LTI 1.3 launch integration. 3. Testing scope ---------------- All validation was performed within a normal student workflow on the Red Team Ops course. The bypass and the cross-user denial of service were confirmed against the production endpoint. The certification exam endpoint was not tested; Skillable subsequently confirmed to an affected customer that the same weakness could affect exam allocations and could return details associated with another learner's session. 4. Summary ---------- The SCORM launch request is assembled and initiated client-side. Loading a lab unit builds a launch URL and requests it from scorm.skillable.com with a SCORM token and userId as query parameters. Skillable validates the token sufficiently to authorise the launch, then evaluates the per-user launch limit against the supplied userId. The token is server-validated, while the userId is client-controlled, and no binding between the two is enforced. The userId accepts arbitrary strings with no format validation. Values with a non-hexadecimal character in an otherwise expected-length identifier, and entirely fabricated structures, were both accepted and provisioned lab instances. The same SCORM token launches labs under different userId values, demonstrating that the token does not bind the launch to the supplied userId. The token remained unchanged across the tested launches, indicating that it did not provide a user-specific binding to the supplied userId. (a) Rate-limit bypass. Launching with a modified userId bypassed the per-user limit and provisioned a fresh LabInstanceId. Two concurrent instances under different userId values were confirmed. (b) Cross-user denial of service. A consenting colleague's userId was obtained through an authenticated learner enumeration vector on the LMS. A lab launched under that userId consumed the colleague's allocation. The colleague then attempted to launch the same lab and was locked out, while other labs launched normally. (c) Cost. Each instance provisions cloud VMs (typically a domain controller plus one to three machines, active 30 to 60 minutes) at the course provider's expense. An authenticated learner enumeration vector on the LMS would scale any of the above across the enumerable enrolled population. 5. Remediation -------------- Bind the launch to a server-validated learner identity, for example through a user-scoped signed token or server-to-server integration. Do not enforce per-user limits using an unverified browser-supplied userId. Skillable states that it will not add this binding to the legacy SCORM path and recommends migration to its API or LTI 1.3 integration. 6. Disclosure timeline ---------------------- 2026-04-28 Per-user rate-limit error observed; userId modification returned a new LabInstanceId 2026-04-29 Concurrent lab instances confirmed against a single account 2026-05-03 Cross-user denial of service confirmed with a consenting fellow student 2026-05-08 Findings documented; Skillable support ticket #4043837 raised; disclosure channel provided 2026-05-11 Report submitted to Disclosures () skillable com (encrypted archive) 2026-05-13 Skillable acknowledged receipt (Nat Shere, Manager, Product Security) 2026-05-19 CVE request submitted to MITRE (Skillable is not a CNA) 2026-05-27 Status request to Skillable; no response 2026-06-08 Second follow-up, restating the 60-day disclosure window (closing 2026-07-12) 2026-06-10 Skillable responded that the issue is "an inherent flaw in the SCORM technology" and requested no disclosure without written permission 2026-06-10 Pushback sent; open-ended embargo declined; 2026-07-12 date held 2026-06-23 MITRE assigned CVE-2026-56877; coordinated disclosure remained under embargo until 2026-07-12 2026-06-26 Skillable sent at least one affected customer an advisory ("SCORM-based lab launches and recommended migration"; no CVE, no CVSS), stating no server-side fix and recommending migration 2026-06-26 Coordination update sent to Skillable 2026-07-12 Advisory published 7. Current status ----------------- Vendor fix: The vendor states that no fix is planned for the SCORM launch path Vendor remediation: Migration to an API or LTI 1.3 launch integration Customer communication: Sent to at least one affected customer on 2026-06-26 (private notification, no CVE, no CVSS) CVE: CVE-2026-56877, assigned by the MITRE CNA of Last Resort 8. References ------------- - https://github.com/GregDurys/security-advisories/tree/main/skillable - https://www.cve.org/CVERecord?id=CVE-2026-56877 - https://cwe.mitre.org/data/definitions/639.html - https://payloadforge.io/beyond-crto-skillable _______________________________________________ Sent through the Full Disclosure mailing list https://nmap.org/mailman/listinfo/fulldisclosure Web Archives & RSS: https://seclists.org/fulldisclosure/
    Severity
    No CVSS data available.
    CWE
    Assigner
    VULNARCHIVE GNA GNA-1988
    GNA scorecard E 38/100 over 445 records in the last 180 days details
    Impacted products
    Relationships
    reference GCVE-1988-2026-0352 (this record)

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              "value": "Skillable\u0027s SCORM lab launch endpoint validates a launch token but\nenforces per-user allocation limits using a browser-supplied userId\nthat is not bound to the validated token. An authenticated learner\ncan modify this identifier to bypass configured limits, launch\nconcurrent lab instances, and consume another learner\u0027s allocation.\nSkillable states that no fix is planned for the legacy SCORM launch\npath. CVE-2026-56877 was assigned by MITRE.\n\n\n1. Advisory information\n-----------------------\nTitle: CVE-2026-56877 - Skillable SCORM userId authorisation\nbypass\nAdvisory: https://github.com/GregDurys/security-advisories/tree/main/skillable\nCVE: CVE-2026-56877 (assigned; record publication pending)\nClass: CWE-639 (Authorization Bypass Through User-Controlled Key)\nCVSS: 6.5 (Medium) - AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\nDate: 2026-07-12\nAuthor: Greg Durys \u003chttps://payloadforge.io\u003e\n\n\n2. Affected software\n--------------------\nVendor: Skillable (formerly Learn on Demand Systems)\nService: Hosted SCORM lab provisioning (cloud service, no\non-premises deployment)\nEndpoint: scorm.skillable.com/scorm/launch\nTested: 2026-04-28 to 2026-05-03 (production endpoint, via the\nRed Team Ops course on the Zero Point Security platform)\nFix: None. The vendor states that no server-side identity\nvalidation will be added to the SCORM launch path.\nRemediation is migration to an API or LTI 1.3 launch\nintegration.\n\n\n3. Testing scope\n----------------\nAll validation was performed within a normal student workflow on\nthe Red Team Ops course. The bypass and the cross-user denial of\nservice were confirmed against the production endpoint. The\ncertification exam endpoint was not tested; Skillable subsequently\nconfirmed to an affected customer that the same weakness could\naffect exam allocations and could return details associated with\nanother learner\u0027s session.\n\n\n4. Summary\n----------\nThe SCORM launch request is assembled and initiated client-side.\nLoading a lab unit builds a launch URL and requests it from\nscorm.skillable.com with a SCORM token and userId as query\nparameters. Skillable validates the token sufficiently to authorise\nthe launch, then evaluates the per-user launch limit against the\nsupplied userId. The token is server-validated, while the userId is\nclient-controlled,\nand no binding between the two is enforced.\n\nThe userId accepts arbitrary strings with no format validation.\nValues with a non-hexadecimal character in an otherwise\nexpected-length identifier, and entirely fabricated structures, were\nboth accepted and provisioned lab instances. The same SCORM token\nlaunches labs under different userId values, demonstrating that the token does not bind the launch to the\nsupplied userId. The token remained unchanged\nacross the tested launches, indicating that it did not provide a\nuser-specific binding to the supplied userId.\n\n(a) Rate-limit bypass. Launching with a modified userId bypassed the\nper-user limit and provisioned a fresh LabInstanceId. Two\nconcurrent instances under different userId values were confirmed.\n\n(b) Cross-user denial of service. A consenting colleague\u0027s userId\nwas obtained through an authenticated learner enumeration vector\non the LMS. A lab launched under that userId consumed the\ncolleague\u0027s allocation. The colleague then attempted to launch\nthe same lab and was locked out, while other labs launched\nnormally.\n\n(c) Cost. Each instance provisions cloud VMs (typically a domain\ncontroller plus one to three machines, active 30 to 60 minutes)\nat the course provider\u0027s expense. An authenticated learner\nenumeration vector on the LMS would scale any of the above\nacross the enumerable enrolled population.\n\n\n5. Remediation\n--------------\nBind the launch to a server-validated learner identity, for example\nthrough a user-scoped signed token or server-to-server integration.\nDo not enforce per-user limits using an unverified browser-supplied\nuserId. Skillable states that it will not add this binding to the\nlegacy SCORM path and recommends migration to its API or LTI 1.3\nintegration.\n\n\n6. Disclosure timeline\n----------------------\n2026-04-28 Per-user rate-limit error observed; userId modification\nreturned a new LabInstanceId\n2026-04-29 Concurrent lab instances confirmed against a single\naccount\n2026-05-03 Cross-user denial of service confirmed with a consenting\nfellow student\n2026-05-08 Findings documented; Skillable support ticket #4043837\nraised; disclosure channel provided\n2026-05-11 Report submitted to Disclosures () skillable com (encrypted\narchive)\n2026-05-13 Skillable acknowledged receipt (Nat Shere, Manager,\nProduct Security)\n2026-05-19 CVE request submitted to MITRE (Skillable is not a CNA)\n2026-05-27 Status request to Skillable; no response\n2026-06-08 Second follow-up, restating the 60-day disclosure window\n(closing 2026-07-12)\n2026-06-10 Skillable responded that the issue is \"an inherent flaw\nin the SCORM technology\" and requested no disclosure\nwithout written permission\n2026-06-10 Pushback sent; open-ended embargo declined; 2026-07-12\ndate held\n2026-06-23 MITRE assigned CVE-2026-56877; coordinated disclosure\nremained under embargo until 2026-07-12\n2026-06-26 Skillable sent at least one affected customer an\nadvisory (\"SCORM-based lab launches and recommended\nmigration\"; no CVE, no CVSS), stating no server-side\nfix and recommending migration\n2026-06-26 Coordination update sent to Skillable\n2026-07-12 Advisory published\n\n\n7. Current status\n-----------------\nVendor fix: The vendor states that no fix is planned for\nthe SCORM launch path\nVendor remediation: Migration to an API or LTI 1.3 launch\nintegration\nCustomer communication: Sent to at least one affected customer on\n2026-06-26 (private notification, no CVE,\nno CVSS)\nCVE: CVE-2026-56877, assigned by the MITRE CNA of\nLast Resort\n\n\n8. References\n-------------\n- https://github.com/GregDurys/security-advisories/tree/main/skillable\n- https://www.cve.org/CVERecord?id=CVE-2026-56877\n- https://cwe.mitre.org/data/definitions/639.html\n- https://payloadforge.io/beyond-crto-skillable\n_______________________________________________\nSent through the Full Disclosure mailing list\nhttps://nmap.org/mailman/listinfo/fulldisclosure\nWeb Archives \u0026 RSS: https://seclists.org/fulldisclosure/"
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    CVE-2026-56877 (GCVE-0-2026-56877)

    Vulnerability from nvd – Published: 2026-07-13 21:51 – Updated: 2026-07-16 06:49
    VLAI
    Summary
    The SCORM lab launch endpoint in Skillable (scorm.skillable.com) through 2026-07-13 does not validate the client-supplied userId parameter against the authenticated SCORM session token. An authenticated user can substitute arbitrary userId values to bypass per-user lab launch rate limits and consume other users' lab allocations, resulting in denial of service against targeted users' lab and exam access. Skillable was formerly named Learn on Demand Systems.
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-07-14 12:46 UTC
    CWE
    • CWE-472 - External Control of Assumed-Immutable Web Parameter
    Assigner
    mitre CNA under the mitre root
    CNA scorecard E 28/100 over 2355 records in the last 180 days details
    Impacted products
    Vendor Product Version
    Skillable SCORM Lab Launch Integration Affected: 0 , ≤ 2026-07-13 (custom)
    Create a notification for this product.
    Show details on NVD website

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    CVE-2026-56877 (GCVE-0-2026-56877)

    Vulnerability from cvelistv5 – Published: 2026-07-13 21:51 – Updated: 2026-07-16 06:49
    VLAI
    Summary
    The SCORM lab launch endpoint in Skillable (scorm.skillable.com) through 2026-07-13 does not validate the client-supplied userId parameter against the authenticated SCORM session token. An authenticated user can substitute arbitrary userId values to bypass per-user lab launch rate limits and consume other users' lab allocations, resulting in denial of service against targeted users' lab and exam access. Skillable was formerly named Learn on Demand Systems.
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-07-14 12:46 UTC
    CWE
    • CWE-472 - External Control of Assumed-Immutable Web Parameter
    Assigner
    mitre CNA under the mitre root
    CNA scorecard E 28/100 over 2355 records in the last 180 days details
    Impacted products
    Vendor Product Version
    Skillable SCORM Lab Launch Integration Affected: 0 , ≤ 2026-07-13 (custom)
    Create a notification for this product.
    Show details on NVD website

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