CVE-2026-56877

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreHIGH confidence

Score 6.3 from GitHub Security Advisory published 2026-07-14. a secondary CVSS source baseline 6.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
6.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.3
EG Score
6.3(high)
EPSS
33.2%
KEV
Not listed

Published

July 13, 2026

Last Modified

July 15, 2026

Advisory Details (2)

Auto-updated Jul 13, 2026
No patch confirmed yet.
generic

oss-security - Skillable SCORM launch: userId parameter not validated against session token allows allocation bypass and cross-user DoS

https://www.openwall.com/lists/oss-security/2026/07/12/1
generic

Security - Skillable

https://www.skillable.com/security/

Vendor Advisories for CVE-2026-56877(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 10× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-15 23:28 UTCEG score recompute
  2. 2026-07-15 23:28 UTCGHSA enrichment
  3. 2026-07-15 16:57 UTCEPSS rescore
  4. 2026-07-15 16:57 UTCEPSS rescore
  5. 2026-07-15 02:00 UTCEPSS rescore
  6. 2026-07-15 02:00 UTCEPSS rescore
  7. 2026-07-14 22:46 UTCEG score recompute
  8. 2026-07-14 22:46 UTCGHSA enrichment
  9. 2026-07-13 22:03 UTCEG score recompute
  10. 2026-07-13 22:02 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-56877?
CVE-2026-56877 is a medium vulnerability published on July 13, 2026. 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…
When was CVE-2026-56877 disclosed?
CVE-2026-56877 was first published in the National Vulnerability Database on July 13, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56877 actively exploited?
CVE-2026-56877 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 33.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56877?
CVE-2026-56877 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-56877?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56877, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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