Microsoft Exchange - Pre-Auth SSRF / ACL Bypass (ProxyNotFound)

Microsoft Exchange Server contains a remote code execution caused by improper input validation in the server component, letting remote attackers execute arbitrary code, exploit requires network access to the server. id: CVE-2021-28480 info: name: Microsoft Exchange - Pre-Auth SSRF / ACL Bypass...

Pre-Auth Takeover of Build Pipelines in GoCD

GoCD contains a critical information disclosure vulnerability whose exploitation allows unauthenticated attackers to leak configuration information including build secrets and encryption keys. id: CVE-2021-43287 info: name: Pre-Auth Takeover of Build Pipelines in GoCD author: dhiyaneshDk severity...

Jira Server Pre-Auth - Arbitrary File Retrieval (WEB-INF, META-INF)

The CachingResourceDownloadRewriteRule class in Jira Server and Jira Data Center allowed unauthenticated remote attackers to read arbitrary files within WEB-INF and META-INF directories via an incorrect path access check. id: CVE-2020-29453 info: name: Jira Server Pre-Auth - Arbitrary File...

CVE-2026-40139

A critical pre-authentication vulnerability exists in the authentication subsystem of BeyondTrust Remote Support. Improper processing of authentication requests may allow an unauthenticated remote attacker to bypass access controls and gain unauthorized access to the appliance, including accounts...

CVE-2026-40139

BeyondTrust Remote Support authentication subsystem contains a critical pre-authentication vulnerability (CVE-2026-40139). Improper processing of authentication requests may allow an unauthenticated remote attacker to bypass access controls and gain unauthorized access to the appliance, including...

EUVD-2026-41887

A critical pre-authentication vulnerability exists in the authentication subsystem of BeyondTrust Remote Support. Improper processing of authentication requests may allow an unauthenticated remote attacker to bypass access controls and gain unauthorized access to the appliance, including accounts...

EUVD-2026-41886

A critical pre-authentication vulnerability exists in the authentication subsystem of BeyondTrust Remote Support and Privileged Remote Access. Improper validation of authentication data may allow a network-positioned attacker to bypass access controls and gain unauthorized access to the appliance...

CVE-2026-40138 Critical Pre-Authentication Vulnerability in BeyondTrust Remote Support and Privileged Remote Access

A critical pre-authentication vulnerability exists in the authentication subsystem of BeyondTrust Remote Support and Privileged Remote Access. Improper validation of authentication data may allow a network-positioned attacker to bypass access controls and gain unauthorized access to the appliance...

CVE-2026-7840 UltraVNC repeater HTTP server global buffer overflow via long URI (pre-auth RCE)

UltraVNC repeater through 1.8.2.2 contains a global buffer overflow in its embedded HTTP administration server. The functions wisenderr and wireplyhdr in repeater/webgui/webutils.c write the caller-supplied HTTP request URI into a fixed 1000-byte global buffer hdrbuf via unchecked sprintf calls...

CVE-2026-7840

CVE-2026-7840 (UltraVNC repeater) : A global buffer overflow in the embedded HTTP administration server affects UltraVNC repeater versions up to 1.8.2.2. The functions wi_senderr() and wi_replyhdr() copy the caller-supplied HTTP request URI into a fixed 1000-byte buffer (hdrbuf) using unchecked s...

CVE-2026-10109

CVE-2026-10109 affects IBM Db2 Server: remote code execution due to improper pre-auth DRDA handshake handling. Affected versions: Db2 11.5.0–11.5.9 and 12.1.0–12.1.4. Impact is high (RCE) per IBM’s bulletin (CVSS v3.1 base 9.8). Remediation: IBM provides interim fixes via Fix Central for V11.5.9 ...

CVE-2026-50734

Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All. An unauthenticated network attacker can cause a broker DoS by sending a crafted WireFormatInfo frame with a malicious large size value. The value is not validate and causes t...

PT-2026-53954

Name of the Vulnerable Software and Affected Versions IBM Db2 versions 11.5.0 through 11.5.9 IBM Db2 versions 12.1.0 through 12.1.4 Description Remote code execution is possible due to improper handling of the pre-authentication DRDA Distributed Relational Database Architecture handshake. This fl...

EUVD-2026-39650

It is possible to bypass the Kerberos pre-authentication check in Apache Kerby by sending a PA-DATA with an unrecognized or unsupported type. Users are recommended to upgrade to version 2.1.2, which fixes this issue...

CVE-2026-53753

CVE-2026-53753 affects Crawl4AI before version 0.8.7. The _safe_eval_expression() AST validator only blocks underscore-prefixed attributes, allowing access to generator/frame attributes (gi_frame, f_back, f_builtins) and enabling sandbox escape to achieve arbitrary code execution. The attack is u...

BIT-MONGODB-2026-9742 Authenticate command with specific mechanism parameter can trigger server crash

When OIDC authentication is enabled in configuration, clients may set specific values in the "mechanism" parameter of the "authenticate" command that lead to server crash. The authenticate command is accessible to unauthenticated clients, leading to pre-auth denial-of-service in affected product...

CVE-2026-48773

ProxySQL is a proxy for MySQL and its forks, as well as PostgreSQL. Versions 2.0.18 through 3.0.8 have a pre-authentication heap memory corruption vulnerability in the MySQL and PostgreSQL protocol first-read paths. A remote unauthenticated client can declare an oversized first packet length, and...

Splunk Enterprise & Cloud Platform - Unrestricted File Upload

In Splunk Enterprise versions below 10.2.4 and 10.0.7, and Splunk Cloud Platform versions below 10.4.2604.3 and 10.2.2510.14, an unauthenticated user could create or truncate arbitrary files through a PostgreSQL sidecar service endpoint.The vulnerability exists because the PostgreSQL sidecar...

CVE-2026-55199

libssh2 through 1.11.1, fixed in commit 1762685, contains a pre-authentication denial of service vulnerability in the SSHMSGEXTINFO handler in src/packet.c that allows a malicious SSH server to cause a client CPU exhaustion loop by sending a crafted extension count value. A malicious server can s...

CVE-2026-55199

libssh2 through 1.11.1, fixed in commit 1762685, contains a pre-authentication denial of service vulnerability in the SSHMSGEXTINFO handler in src/packet.c that allows a malicious SSH server to cause a client CPU exhaustion loop by sending a crafted extension count value. A malicious server can s...