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onyx --cves cve-2026-88008

CVE-2026-88008

CRITPOCTraefik
score
9.9
cvss
9.1
epss
0.5%
published
2026-09-10
kev added
—
first seen

Traefik 2.11.26 to 2.11.57 and 3.7.13 contain an authentication bypass caused by forwarding client-supplied Upgrade headers to backends supporting h2c, letting unauthenticated attackers access protected routes, exploit requires backend accepting h2c and returning 101 Switching Protocols.

Timeline

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

events2026-09-10 — PublishedP2026-10-21 (seen by) — Tracked by OnyxT2026-10-21 (seen by) — Public PoCXscore2026-10-21: score 9.99.9epss2026-09-22: epss 0.3%2026-09-23: epss 0.3%2026-09-24: epss 0.5%2026-09-25: epss 0.5%2026-09-26: epss 0.5%2026-09-27: epss 0.5%2026-09-29: epss 0.5%2026-09-30: epss 0.5%2026-10-01: epss 0.5%2026-10-02: epss 0.5%2026-10-03: epss 0.5%2026-10-04: epss 0.5%2026-10-05: epss 0.5%2026-10-06: epss 0.5%2026-10-07: epss 0.5%2026-10-08: epss 0.5%2026-10-09: epss 0.5%2026-10-10: epss 0.5%2026-10-11: epss 0.5%2026-10-12: epss 0.5%2026-10-13: epss 0.5%2026-10-14: epss 0.5%2026-10-15: epss 0.5%2026-10-16: epss 0.5%2026-10-18: epss 0.5%2026-10-19: epss 0.5%2026-10-20: epss 0.5%2026-10-21: epss 0.5%0.5%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-444

References 5