Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
Unknown Arvow AI SEO Writer — Arvow AI SEO Writer < 1.5.4 - Unauthenticated Arbitrary Post Creation via Webhook Secret Type-Juggling
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N N U L H N 8.2 .0026 17.3 —
AFFECTED
Product Versions Fixed
Arvow AI SEO Writer unspecified —
TIMELINE
Jul 20 Reserved by WPScan
Aug 10 Published (CNA: WPScan)
Aug 11 EXPLOIT PUBLISHED — CVE-2026-16257 (Unknown Arvow AI SEO Writer). Public exploit reference added.
Description
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| July 20, 2026 | Reserved | Reserved by WPScan |
| August 10, 2026 | Published | Published (CNA: WPScan) |
| August 11, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-16257 (Unknown Arvow AI SEO Writer). Public exploit reference added. |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Unknown | Arvow AI SEO Writer | — | — | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-16257 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.