VulnSocial

CVE-2026-56877Disclosure

LOWCVSS 6.3 · MEDIUM

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

  • Hunt for exploitation attempts and persistence artifacts
  • Increase monitoring for publicly documented tradecraft
  • Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

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.

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1.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-472

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

NONE

Threat summary

  • Public PoC is present in monitored signal
  • 1 mentions across 1 observed day

What's happening

  • PoC mentioned or linked in 1 signal
  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • 1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-07-13: 1PoC Mentioned / Linked · 2026-07-13: 1Technical Details · 2026-07-13: 107-13
Signal classification1 categories
Disclosure
1100.0%
Referenced assets1 URL
By indicator
Full discourse1 post
  • Payload Forge@payloadforge
    Disclosure

    I bypassed Skillable's per-user lab limit by changing a userId the browser hands over, then used a colleague's allocation with his consent. Skillable says it is SCORM's fault, not theirs, and will not fix. So I disclosed it. CVE-2026-56877. https://payloadforge.io/beyond-crto-skillable

    Post summary

    The author discovered a vulnerability that bypasses per-user lab limits by altering the userId, disclosed the CVE, and provided a link to a PoC, but no patch or active exploitation is reported.

    0001044
    26 followersView on X

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