onyx

onyx --cves cve-2026-27590

CVE-2026-27590

CRITPOCCaddy
score
0.1
cvss
9.8
epss
0.9%
published
2026-02-24
kev added
—
first seen

Caddy < 2.11.1 contains a path confusion vulnerability caused by unsafe FastCGI path splitting logic with Unicode lowercasing, letting attackers cause unintended PHP file execution, exploit requires attacker-controlled file upload.

Timeline

How this CVE moved toward exploitation. Chart: last 30 days — trend score, EPSS, community mentions per day; hover the event lane.

events2026-02-24 — PublishedP2026-10-21 — Tracked by OnyxT2026-10-21 — Public PoCXscore2026-10-21: score 0.10.1epss2026-09-22: epss 0.5%2026-09-23: epss 0.5%2026-09-24: epss 0.9%2026-09-25: epss 0.9%2026-09-26: epss 0.9%2026-09-27: epss 0.9%2026-09-29: epss 0.9%2026-09-30: epss 0.9%2026-10-01: epss 0.9%2026-10-02: epss 0.9%2026-10-03: epss 0.9%2026-10-04: epss 0.9%2026-10-05: epss 0.9%2026-10-06: epss 0.9%2026-10-07: epss 0.9%2026-10-08: epss 0.9%2026-10-09: epss 0.9%2026-10-10: epss 0.9%2026-10-11: epss 0.9%2026-10-12: epss 0.9%2026-10-13: epss 0.9%2026-10-14: epss 0.9%2026-10-15: epss 0.9%2026-10-16: epss 0.9%2026-10-18: epss 0.9%2026-10-19: epss 0.9%2026-10-20: epss 0.9%2026-10-21: epss 0.9%0.9%mentions/day0no mentions in 30 days2026-09-22today
  1. Published
  2. Tracked by Onyx
  3. Public PoC

Exploit availability

Public PoC flagged by vulnx; no direct exploit link among the citations.

Weaknesses

CWE-20

References 3