CVE-2026-16644

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-26. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

Incorrect Authorization vulnerability in Drupal Webform REST allows Forceful Browsing. This issue affects Webform REST versions: from 0.0.0 to 4.1.0.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

August 25, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Aug 29, 2026
No patch confirmed yet.
generic

Webform REST - Moderately critical - Access bypass - SA-CONTRIB-2026-087 | Drupal.org

https://www.drupal.org/sa-contrib-2026-087

Vendor Advisories for CVE-2026-16644(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 32× in last 7d / 32× 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. 2026-08-30 02:32 UTCEG score recompute
  2. 2026-08-30 02:32 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-29 22:09 UTCGHSA enrichment
  5. 2026-08-29 17:46 UTCGHSA enrichment
  6. 2026-08-29 13:19 UTCGHSA enrichment
  7. 2026-08-29 08:54 UTCGHSA enrichment
  8. 2026-08-29 04:31 UTCGHSA enrichment
  9. 2026-08-29 00:02 UTCEG score recompute
  10. 2026-08-29 00:02 UTCGHSA enrichment
  11. 2026-08-28 21:41 UTCEPSS rescore
  12. 2026-08-28 15:52 UTCGHSA enrichment
  13. 2026-08-28 12:03 UTCGHSA enrichment
  14. 2026-08-28 07:40 UTCGHSA enrichment
  15. 2026-08-28 03:13 UTCGHSA enrichment
  16. 2026-08-27 22:50 UTCGHSA enrichment
  17. 2026-08-27 18:28 UTCEG score recompute
  18. 2026-08-27 18:27 UTCGHSA enrichment
  19. 2026-08-27 14:25 UTCEPSS rescore
  20. 2026-08-27 14:02 UTCGHSA enrichment
  21. 2026-08-27 09:39 UTCGHSA enrichment
  22. 2026-08-27 05:16 UTCGHSA enrichment
  23. 2026-08-27 00:53 UTCEG score recompute
  24. 2026-08-27 00:53 UTCGHSA enrichment
  25. 2026-08-26 20:30 UTCGHSA enrichment
Show 7 more
  1. 2026-08-26 19:27 UTCEG score recompute▲ 9.10
  2. 2026-08-26 19:27 UTCGHSA enrichment
  3. 2026-08-26 19:26 UTCMITRE cvelistV5CVSS v3 → 9.1 · severity → CRITICAL
  4. 2026-08-26 14:46 UTCEPSS rescore
  5. 2026-08-25 23:30 UTCNVD update
  6. 2026-08-25 22:35 UTCEG score recompute
  7. 2026-08-25 22:34 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-16644?
CVE-2026-16644 is a critical vulnerability published on August 25, 2026. Incorrect Authorization vulnerability in Drupal Webform REST allows Forceful Browsing. This issue affects Webform REST versions: from 0.0.0 to 4.1.0.
When was CVE-2026-16644 disclosed?
CVE-2026-16644 was first published in the National Vulnerability Database on August 25, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16644 actively exploited?
CVE-2026-16644 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 76.4% of all scored CVEs.
What is the CVSS score of CVE-2026-16644?
CVE-2026-16644 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-16644?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16644, 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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