authentication bypass

About this tag
The authentication bypass tag on WindowsForum.com covers vulnerabilities that allow attackers to circumvent login or credential checks in network equipment, industrial control systems, and enterprise management tools. Recent discussions include CISA-alerted exploits in Cisco SD-WAN controllers, Siemens SINEC NMS flaws patched in V4.0 SP3, and a privilege escalation in Windows Admin Center. Other topics include libcurl GSSAPI delegation bypass, Prometheus exporter-toolkit cache poisoning, missing authentication in ZLAN serial-to-Ethernet gateways, and TP-Link VIGI camera password-reset bypass. These threads emphasize patching, network segmentation, and monitoring for exposed authentication interfaces.

  1. CVE-2026-20182 KEV Alert: Cisco SD-WAN Authentication Bypass Now Actively Exploited

    On May 14, 2026, CISA added CVE-2026-20182, a Cisco Catalyst SD-WAN Controller authentication bypass vulnerability, to its Known Exploited Vulnerabilities Catalog after evidence showed the flaw is being actively exploited in the wild. The move is not just another entry in a federal spreadsheet...
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    • authentication bypass cisa kev cisco sd-wan network security
    • Replies: 0
    • Forum: Security Alerts

  2. CVE-2026-24032 Fix for Siemens SINEC NMS Auth Bypass (UMC) — Upgrade to V4.0 SP3

    Siemens has patched a high-severity authentication bypass in SINEC NMS that affects installations using the User Management Component (UMC), and the security significance is hard to overstate: a remote attacker may be able to skip authentication entirely and reach the application without valid...
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    • authentication bypass cve-2026-24032 ot cybersecurity siemens sinec nms
    • Replies: 0
    • Forum: Security Alerts

  3. Siemens SINEC NMS Authentication Bypass: Patch to V4.0 SP3+ Now

    Siemens’ latest SINEC NMS security disclosure is the kind of industrial advisory that demands immediate attention because it combines a network-reachable authentication bypass with a product that sits squarely in the access-control path for critical operations. The issue affects SINEC NMS when...
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    • authentication bypass industrial cybersecurity siemens sinec nms umc patch update
    • Replies: 0
    • Forum: Security Alerts

  4. CVE-2026-26119: Urgent Windows Admin Center Privilege Escalation Patch

    A newly disclosed flaw in Windows Admin Center (WAC) — tracked as CVE‑2026‑26119 and carrying a CVSS score reported as 8.8 — creates a real and immediate risk: an authenticated but low‑privileged user could escalate their privileges across an enterprise management plane and inherit the authority...
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    • authentication bypass patch management privilege escalation windows admin center
    • Replies: 0
    • Forum: Windows News

  5. CVE-2023-27536: libcurl GSSAPI Delegation Flaw Causes Connection Reuse Privilege Bypass

    A subtle connection-reuse bug in libcurl—tracked as CVE-2023-27536—exposed a real-world risk that the library could accidentally reuse an authenticated connection with higher GSSAPI/Kerberos delegation permissions for a subsequent transfer that should have been performed with lower permissions...
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    • authentication bypass cve 2023 27536 gssapi delegation libcurl
    • Replies: 0
    • Forum: Security Alerts

  6. Prometheus exporter-toolkit Auth Bypass via Cache Poisoning (CVE-2022-46146)

    Prometheus exporter-toolkit contains a serious basic‑authentication bypass that can be triggered when an attacker has access to a Prometheus-style web.yml file and the bcrypt password hashes it contains—allowing the attacker to poison an internal authentication cache and authenticate without...
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    • authentication bypass cache poisoning exporter toolkit prometheus
    • Replies: 0
    • Forum: Security Alerts

  7. ZLAN5143D Missing Authentication: Critical ICS Gateway Vulnerability Explained

    The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has flagged the ZLAN Information Technology Co. ZLAN5143D serial-to-Ethernet gateway — specifically firmware v1.600 — as affected by two high-severity weaknesses that allow an attacker to bypass authentication or reset device...
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    • authentication bypass ics risk industrial cybersecurity zlan5143d
    • Replies: 0
    • Forum: Security Alerts

  8. TP-Link VIGI CVE-2026-0629: Authentication Bypass Patch Guide

    TP-Link’s VIGI professional camera line is the subject of a high‑severity authentication bypass that allows a local attacker to reset the administrator password and seize full administrative control of dozens of models unless they are running patched firmware. The issue, tracked as...
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    • authentication bypass cve 2026 0629 firmware patch tp-link vigi
    • Replies: 0
    • Forum: Security Alerts

  9. CVE-2026-24858 Fortinet SSO Bypass: Urgent Patch and Mitigation

    Fortinet has confirmed a new, actively exploited authentication‑bypass flaw—tracked as CVE‑2026‑24858—that allows an attacker who controls a FortiCloud account and a registered device to gain administrative access to other Fortinet devices where FortiCloud single sign‑on (SSO) is enabled. This...
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    • authentication bypass cve 2026 24858 forticloud sso fortinet
    • Replies: 0
    • Forum: Security Alerts