CVE-2026-16624

CRITICALPre-NVD 9.69.6—
EchelonGraph scoreHIGH confidence

Score 9.6 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-22. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this weekElevated
9.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.6Exploit: Elevated riskExposed: 0

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

Cal.com OSS ships lacks authorization on webhook teamId creation, allowing any authenticated user to create a webhook on any team via unvalidated teamId injection, then steal booking data, including fields like organizer/attendee emails and custom responses, and conditionally video-call passwords, by triggering webhook delivery.

CVSS v3
9.6
EG Score
9.6(high)
EG Risk
59(Track*)
EG Risk 59/100SSVC: Track*

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
Severity96% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
20%
KEV
Not listed

Published

July 22, 2026

Last Modified

July 27, 2026

References (3)

Vendor Advisories for CVE-2026-16624(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 28× in last 7d / 28× 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. 2026-07-28 17:31 UTCEG score recompute
  2. 2026-07-28 17:31 UTCGHSA enrichment
  3. 2026-07-28 13:39 UTCGHSA enrichment
  4. 2026-07-28 09:44 UTCGHSA enrichment
  5. 2026-07-28 05:53 UTCGHSA enrichment
  6. 2026-07-28 02:01 UTCGHSA enrichment
  7. 2026-07-27 22:12 UTCEG score recompute
  8. 2026-07-27 22:12 UTCGHSA enrichment
  9. 2026-07-27 18:24 UTCEG score recompute
  10. 2026-07-27 18:23 UTCGHSA enrichment
  11. 2026-07-27 18:22 UTCGHSA enrichment
  12. 2026-07-27 17:36 UTCEG score recompute▲ 9.60
  13. 2026-07-27 17:36 UTCGHSA enrichment
  14. 2026-07-27 17:35 UTCMITRE cvelistV5CVSS v3 → 9.6 · severity → CRITICAL
  15. 2026-07-27 14:13 UTCEPSS rescore
  16. 2026-07-26 14:54 UTCEPSS rescore
  17. 2026-07-26 14:54 UTCEPSS rescore
  18. 2026-07-26 03:26 UTCEG score recompute
  19. 2026-07-26 03:26 UTCGHSA enrichment
  20. 2026-07-24 14:17 UTCEPSS rescore
  21. 2026-07-23 14:18 UTCEPSS rescore
  22. 2026-07-23 14:18 UTCEPSS rescore
  23. 2026-07-23 03:06 UTCEG score recompute
  24. 2026-07-22 21:58 UTCEG score recompute
  25. 2026-07-22 21:58 UTCGHSA enrichment
Show 3 more
  1. 2026-07-22 20:53 UTCNVD update
  2. 2026-07-22 18:37 UTCEG score recompute
  3. 2026-07-22 18:35 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-16624?
CVE-2026-16624 is a critical vulnerability published on July 22, 2026. Cal.com OSS ships lacks authorization on webhook teamId creation, allowing any authenticated user to create a webhook on any team via unvalidated teamId injection, then steal booking data, including fields like organizer/attendee emails and custom responses, and conditionally video-call passwords,…
When was CVE-2026-16624 disclosed?
CVE-2026-16624 was first published in the National Vulnerability Database on July 22, 2026, with the most recent update on July 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16624 actively exploited?
CVE-2026-16624 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 79.6% of all scored CVEs.
What is the CVSS score of CVE-2026-16624?
CVE-2026-16624 has a CVSS v3.1 base score of 9.6 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-16624?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16624, 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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