# CVE-2026-118063: Advance Guest Post <= 1.9 - Unauthenticated Arbitrary File Upload via gallery_action

Status: published. Published: 2026-11-13. Updated: 2026-11-13.

The Advance Guest Post WordPress plugin through 1.9 does not properly validate uploaded files, relying on a case-sensitive and incomplete extension check that unauthenticated users can trivially bypass, allowing them to upload arbitrary files, including executable PHP variants, into a web-reachable directory, which can lead to remote code execution depending on the server configuration.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Unknown / Advance Guest Post: ≥ 0; ≤ 1.9 (affected, semver). Source: CNA: WPScan

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-434

## Exploit evidence

- exploit: https://wpscan.com/vulnerability/45ea832a-9ed9-4f75-bc84-1b09794d362a/ (CNA: WPScan)

## References

- https://wpscan.com/vulnerability/45ea832a-9ed9-4f75-bc84-1b09794d362a/ (CNA: WPScan; exploit, vdb-entry, technical-description)

## Provenance

- CNA: WPScan: https://www.cve.org/CVERecord?id=CVE-2026-118063; retrieved 2026-11-13; source updated 2026-11-13

Revision: 3ba7e8e4ff21af5740e9a47bcfa766b743dd81b9aa5930e058b337ee8297ba43

Canonical: https://y2.dev/cve/CVE-2026-118063

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.