CVE-2026-16632Public exploitNetwork attack vector

Unauthenticated action execution via unmasked frames

Published Jul 22, 2026 · Updated Jul 22, 2026

Improper WebSocket frame validation in Boaz Segev facil.io 0.7.0 through 0.7.4 allows remote attackers to execute one application action. The parser calls websocket_on_protocol_error for a client frame with MASK cleared but continues into opcode dispatch and invokes on_message before teardown. Exposure requires a reachable facil.io WebSocket endpoint; each connection can cause one unauthorized state-changing action defined by the application's callback.

CVSS severity7.3
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper WebSocket frame validation in Boaz Segev facil.io 0.7.0 through 0.7.4 allows remote attackers to execute one application action. The parser calls websocket_on_protocol_error for a client frame with MASK cleared but continues into opcode dispatch and invokes on_message before teardown. Exposure requires a reachable facil.io WebSocket endpoint; each connection can cause one unauthorized state-changing action defined by the application's callback.

The record

CVE
CVE-2026-16632
Published
Jul 22, 2026
Updated
Jul 22, 2026
Vendor
Boaz Segev
Product
facil.io
Classifications
CWE-20, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.7.0
  2. Affected versionversion=0.7.1
  3. Affected versionversion=0.7.2
  4. Affected versionversion=0.7.3
  5. Affected versionversion=0.7.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Boaz Segev · facil.ioversion=0.7.0; version=0.7.1; version=0.7.2; version=0.7.3; version=0.7.4

Published CVSS scores

7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo