by Kastro
Paper/Archive/CVE-2026-118063

CVE-2026-118063

Unknown Advance Guest Post — Advance Guest Post <= 1.9 - Unauthenticated Arbitrary File Upload via gallery_action

EPSS 0.2%CVSS 9.8
critical.is priorityof 100
32
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 11.7.117 × 202.3No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Advance Guest Post≤ 1.9–CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

exploitwpscan.com/vulnerability/45ea832a-9ed9-4f75-bc84-1b09794d362a