CVE-2026-100556

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreHIGH confidence

Score 6.3 from GitHub Security Advisory published 2026-09-26. A secondary CVSS source baseline 6.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

OpenClaw (npm package openclaw) versions >= 2026.5.2 and < 2026.8.1 contain an incorrect authorization vulnerability in WhatsApp group handling. A group sender who is admitted for ordinary messages but denied by commands.allowFrom or owner command authorization can issue the /new command to reset the shared group session and persist a provider and model override. This allows a command-denied group member to select a provider and model already permitted by the operator for subsequent turns in the shared group session, potentially changing provider routing, cost, data flow, or availability. It does not allow adding a new provider or host command execution. The issue is fixed in version 2026.8.1.

CVSS v3
6.3
EG Score
6.3MEDIUMhigh confidence
EG Risk
28
EG Risk 28/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity63% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
18th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 26, 2026

Last Modified

September 30, 2026

Advisory Details (2)

Auto-updated Sep 26, 2026
Patch available. Sources: github.
generic Patch Available

OpenClaw before 2026.8.1 Authentication Bypass via Session Reset | Advisories | VulnCheck

https://www.vulncheck.com/advisories/openclaw-before-2026.8.1-authentication-bypass-via-session-reset
github Patch Available

WhatsApp session resets could bypass command authorization · Advisory · openclaw/openclaw · GitHub

https://github.com/openclaw/openclaw/security/advisories/GHSA-mm7m-wcgh-8mfq

Vendor Advisories for CVE-2026-100556(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 23× in last 7d / 29× 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. 2026-10-03 19:38 UTCEG score recompute
  2. 2026-10-03 19:38 UTCGHSA enrichment
  3. 2026-10-03 14:25 UTCEPSS rescore
  4. 2026-10-02 21:11 UTCEG score recompute
  5. 2026-10-02 21:11 UTCGHSA enrichment
  6. 2026-10-01 22:43 UTCEG score recompute
  7. 2026-10-01 22:43 UTCGHSA enrichment
  8. 2026-10-01 19:49 UTCEPSS rescore
  9. 2026-10-01 00:15 UTCEG score recompute
  10. 2026-10-01 00:15 UTCGHSA enrichment
  11. 2026-09-30 15:02 UTCEPSS rescore
  12. 2026-09-30 01:30 UTCEG score recompute
  13. 2026-09-30 01:30 UTCGHSA enrichment
  14. 2026-09-30 00:37 UTCEG score recompute
  15. 2026-09-30 00:37 UTCGHSA enrichment
  16. 2026-09-29 15:20 UTCEPSS rescore
  17. 2026-09-29 13:59 UTCEG score recompute
  18. 2026-09-29 13:59 UTCGHSA enrichment
  19. 2026-09-28 15:31 UTCEG score recompute
  20. 2026-09-28 15:31 UTCGHSA enrichment
  21. 2026-09-28 13:50 UTCEPSS rescore
  22. 2026-09-28 00:22 UTCEG score recompute
  23. 2026-09-28 00:22 UTCGHSA enrichment
  24. 2026-09-27 01:54 UTCEG score recompute
  25. 2026-09-27 01:54 UTCGHSA enrichment
Show 4 more
  1. 2026-09-26 15:58 UTCEPSS rescore
  2. 2026-09-26 03:25 UTCEG score recompute
  3. 2026-09-26 02:32 UTCEG score recompute
  4. 2026-09-26 02:29 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-100556?
CVE-2026-100556 is a medium vulnerability published on September 26, 2026. OpenClaw (npm package openclaw) versions >= 2026.5.2 and < 2026.8.1 contain an incorrect authorization vulnerability in WhatsApp group handling. A group sender who is admitted for ordinary messages but denied by commands.allowFrom or owner command authorization can issue the /new <model> command to…
When was CVE-2026-100556 disclosed?
CVE-2026-100556 was first published on September 26, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-100556 actively exploited?
CVE-2026-100556 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (18th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-100556?
CVE-2026-100556 has a CVSS base score of 6.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-100556?
A fix for CVE-2026-100556 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-100556 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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