Is CVE-2026-56877 in the CISA KEV catalog?

No. CVE-2026-56877 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-56877?

CVE-2026-56877 has a CVSS v3 base score of 6.3 (MEDIUM).

What is the EPSS score for CVE-2026-56877?

CVE-2026-56877 has an EPSS score of 0.41% (33th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-56877?

No published fix for CVE-2026-56877 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-56877

MEDIUM

6.3

CVSS v3

NVD

Description

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.

CWE-472

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Exploit Intelligence

0.41%probability of exploitation in 30 days

33rdpercentile

Low risk: more likely to be exploited than 33% of all known CVEs.

References

Other references5

Related Vulnerabilities

Other CWE-472 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-25153	Critical	9.8	42%	-	Fix
CVE-2025-6191	High	8.8	9.2%	-	Fix
CVE-2017-5261	High	8.8	8.9%	-	-
CVE-2025-7656	High	8.8	8.6%	-	Fix
CVE-2017-5260	High	8.8	8.1%	-	-
CVE-2025-10891	High	8.8	6.6%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-16.