← Vulnerability feed

Vulnerability record · CVE-2026-58172 · published 30 June 2026

CVE-2026-58172: Authentication bypass via alternate path vulnerability

Ocelot through 24.1.0, fixed in commit f156fd4, contains a security control bypass vulnerability that allows denied clients to circumvent IP-based access restrictions by sending WebSocket upgrade requests. The WebSocket upgrade pipeline branch configured via MapWhen in OcelotPipelineExtensions.cs omits SecurityMiddleware, causing requests from blocked IP addresses to be proxied to downstream services without enforcement of the configured allow/block list.

9.3 CVSS 4.0 Critical EPSS 0.57% · top 55.3% CWE-288 · Authentication bypass via alternate path Deferred
9.3CVSS 4.0 base score
0.57%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
14 Jul 2026Last modified by NVD

Description

Ocelot through 24.1.0, fixed in commit f156fd4, contains a security control bypass vulnerability that allows denied clients to circumvent IP-based access restrictions by sending WebSocket upgrade requests. The WebSocket upgrade pipeline branch configured via MapWhen in OcelotPipelineExtensions.cs omits SecurityMiddleware, causing requests from blocked IP addresses to be proxied to downstream services without enforcement of the configured allow/block list.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/ThreeMammals/Ocelot/commit/f156fd4017ca25025fffdad8ec56c1d657dfb402
https://github.com/ThreeMammals/Ocelot/issues/2403
https://github.com/ThreeMammals/Ocelot/pull/2406
https://www.vulncheck.com/advisories/ocelot-ip-allow-block-list-bypass-for-websocket-upgrade-requests

Track CVE-2026-58172 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2026-20079Cisco Secure Firewall Management Center authentication bypass to rootCisco Secure Firewall Management Center (FMC) Software contains an authentication bypass caused by an improper system process created at boot time. A…KEVEPSS 88%analysed9.3CVE-2026-19490Citrix NetScaler ADC and Gateway authentication bypass via alternate pathNetScaler ADC and NetScaler Gateway contain an authentication bypass via an alternate path or channel (CWE-288). The flaw is remotely reachable witho…KEVEPSS 7.0%analysed8.2CVE-2026-18556N-able N-central authentication bypass via alternate pathN-able N-central contains an authentication bypass (CWE-288) that lets an attacker reach protected functionality through an alternate path or channel…KEVEPSS 7.9%analysed8.2CVE-2026-18577N-able N-central incomplete patch enables auth bypass and account takeoverAn incomplete fix for CVE-2026-18556 leaves an alternate-path authentication bypass in N-able N-central through version 2026.3.1. Because the origina…KEVEPSS 15%analysed7.5CVE-2026-1603Ivanti Endpoint Manager authentication bypass leaks stored credentialsIvanti Endpoint Manager before 2024 SU5 contains an authentication bypass (CWE-288/CWE-306) that lets a remote, unauthenticated attacker reach a func…KEVEPSS 88%analysed9.8CVE-2026-24858Fortinet FortiCloud SSO authentication bypass across registered devicesA CWE-288 authentication bypass in Fortinet FortiAnalyzer, FortiManager, FortiNAC-F, FortiOS, FortiProxy and FortiWeb lets an attacker with a FortiCl…KEVEPSS 86%analysed9.3CVE-2026-23760SmarterMail password reset API authentication bypassSmarterMail builds prior to 9511 expose a force-reset-password endpoint that accepts anonymous requests and does not verify the current password or a…KEVEPSS 97%analysed9.2CVE-2025-34026Versa Concerto authentication bypass in Traefik proxy exposes admin endpointsVersa Concerto's Traefik reverse proxy configuration contains an authentication bypass (CWE-288) that lets an unauthenticated attacker reach administ…KEVEPSS 82%analysed

Source: NIST National Vulnerability Database (record CVE-2026-58172), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.