CVE-2026-16257

HIGHPre-NVD 8.28.2—
EchelonGraph scoreHIGH confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-08-10. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.2Exploit: None knownExposed: 0

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

The Arvow AI SEO Writer WordPress plugin before 1.5.4 does not properly restrict access to one of its REST endpoints, whose only access control can be bypassed by unauthenticated users through type juggling when the Arvow AI SEO Writer WordPress plugin before 1.5.4 has not been configured, allowing them to create arbitrary posts and pages and to disclose author account and taxonomy information.

CVSS v3
8.2
EG Score
8.2(high)
EG Risk
52(Track)
EG Risk 52/100SSVC: 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
Severity82% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
17%
KEV
Not listed

Published

August 10, 2026

Last Modified

August 11, 2026

Advisory Details (1)

Auto-updated Aug 11, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Arvow AI SEO Writer < 1.5.4 – Unauthenticated Arbitrary Post Creation via Webhook Secret Type-Juggling | CVE 2026-16257 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/89c32854-1cf1-4fe9-a6d0-6244be2dcc03/

Vendor Advisories for CVE-2026-16257(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 26× in last 7d / 44× 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. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 22:10 UTCGHSA enrichment
  3. 2026-08-20 09:23 UTCGHSA enrichment
  4. 2026-08-19 20:38 UTCEG score recompute
  5. 2026-08-19 20:38 UTCGHSA enrichment
  6. 2026-08-19 17:03 UTCEPSS rescore
  7. 2026-08-19 07:53 UTCGHSA enrichment
  8. 2026-08-18 19:08 UTCEG score recompute
  9. 2026-08-18 19:08 UTCGHSA enrichment
  10. 2026-08-18 13:48 UTCEPSS rescore
  11. 2026-08-18 06:22 UTCGHSA enrichment
  12. 2026-08-17 17:37 UTCEG score recompute
  13. 2026-08-17 17:37 UTCGHSA enrichment
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-17 04:50 UTCGHSA enrichment
  16. 2026-08-16 16:05 UTCEG score recompute
  17. 2026-08-16 16:05 UTCGHSA enrichment
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 03:20 UTCEG score recompute
  20. 2026-08-16 03:20 UTCGHSA enrichment
  21. 2026-08-16 02:14 UTCEPSS rescore
  22. 2026-08-15 14:35 UTCGHSA enrichment
  23. 2026-08-15 01:49 UTCEG score recompute
  24. 2026-08-15 01:49 UTCGHSA enrichment
  25. 2026-08-15 01:30 UTCEPSS rescore
Show 19 more
  1. 2026-08-14 13:05 UTCGHSA enrichment
  2. 2026-08-14 00:20 UTCEG score recompute
  3. 2026-08-14 00:20 UTCGHSA enrichment
  4. 2026-08-13 22:00 UTCEPSS rescore
  5. 2026-08-13 11:34 UTCGHSA enrichment
  6. 2026-08-12 22:49 UTCEG score recompute
  7. 2026-08-12 22:49 UTCGHSA enrichment
  8. 2026-08-12 13:50 UTCEPSS rescore
  9. 2026-08-12 10:04 UTCEG score recompute
  10. 2026-08-12 10:04 UTCGHSA enrichment
  11. 2026-08-11 21:19 UTCGHSA enrichment
  12. 2026-08-11 20:31 UTCEG score recompute▲ 8.20
  13. 2026-08-11 20:30 UTCGHSA enrichment
  14. 2026-08-11 20:30 UTCMITRE cvelistV5CVSS v3 → 8.2 · severity → HIGH
  15. 2026-08-11 13:42 UTCEPSS rescore
  16. 2026-08-11 00:00 UTCEPSS rescore
  17. 2026-08-10 07:19 UTCNVD update
  18. 2026-08-10 06:42 UTCEG score recompute
  19. 2026-08-10 06:41 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-16257?
CVE-2026-16257 is a high vulnerability published on August 10, 2026. The Arvow AI SEO Writer WordPress plugin before 1.5.4 does not properly restrict access to one of its REST endpoints, whose only access control can be bypassed by unauthenticated users through type juggling when the Arvow AI SEO Writer WordPress plugin before 1.5.4 has not been configured, allowing…
When was CVE-2026-16257 disclosed?
CVE-2026-16257 was first published in the National Vulnerability Database on August 10, 2026, with the most recent update on August 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16257 actively exploited?
CVE-2026-16257 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 82.7% of all scored CVEs.
What is the CVSS score of CVE-2026-16257?
CVE-2026-16257 has a CVSS v3.1 base score of 8.2 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-16257?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16257, 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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