Exploit for Reliance on Untrusted Inputs in a Security Decision in Microsoft

CVE-2026-21509 Mitigation Script Traditional Chinese version:...

Patch Tuesday - February 2026

Microsoft is publishing 55 vulnerabilities this February 2026 Patch Tuesday. Microsoft is aware of exploitation in the wild for six of today’s vulnerabilities, and notes public disclosure for three of those. Earlier in the month, Microsoft provided patches to address three browser vulnerabilities...

Microsoft Patch Tuesday for February 2026 — Snort rules and prominent vulnerabilities

Microsoft has released its monthly security update for February 2026, which includes 59 vulnerabilities affecting a range of products, including two that Microsoft marked as "Critical". CVE-2026-21522 is a critical elevation of privilege vulnerability affecting Microsoft ACI Confidential...

SolarWinds Web Help Desk Exploited for RCE in Multi-Stage Attacks on Exposed Servers

Microsoft has revealed that it observed a multi‑stage intrusion that involved the threat actors exploiting internet‑exposed SolarWinds Web Help Desk WHD instances to obtain initial access and move laterally across the organization's network to other high-value assets. That said, the Microsoft...

Vulnerability fixed in SmarterTools SmarterMail

SmarterTools has fixed vulnerabilities in SmarterMail. A malicious party could exploit the vulnerabilities to bypass authentication and execute arbitrary code with administrator privileges, and possibly SYSTEM. For successful abuse, the malicious party must have access to the API interface...

PT-2026-6632

Name of the Vulnerable Software and Affected Versions Fortinet FortiOS versions through 7.6.6 Description Fortinet FortiOS through version 7.6.6 allows attackers to decrypt LDAP credentials stored in device configuration files. This issue was exploited in the wild between December 16, 2025, and...

VulnCheck KEV: CVE-2026-25815

Fortinet FortiOS through 7.6.6 allows attackers to decrypt LDAP credentials stored in device configuration files, as exploited in the wild from 2025-12-16 through 2026 by default, the encryption key is the same across all customers' installations. NOTE: the Supplier's position is that the instanc...

SolarWinds Web Help Desk < 12.8.3 - Insecure Deserialization

SolarWinds Web Help Desk before version 12.8.3 contain a critical Java deserialization vulnerability that enables remote code execution. Attackers can exploit this flaw to execute arbitrary commands on the host machine. Initially reported as unauthenticated, SolarWinds was unable to reproduce...

Mutagen Astronomy: From Discovery to CISA Recognition—A Seven-Year Journey

Introduction On January 26, 2026,the Cybersecurity and Infrastructure Security Agency CISA added CVE-2018-14634 to its Known Exploited Vulnerabilities KEV catalog. The same vulnerability was discovered by the Qualys Threat Research Unit TRU in September 2018. We nicknamed it "Mutagen Astronomy" a...

Critical Ivanti Endpoint Manager Mobile (EPMM) zero-day exploited in the wild (CVE-2026-1281 & CVE-2026-1340)

Overview On January 29, 2026, Ivanti disclosed two new critical vulnerabilities affecting Endpoint Manager Mobile EPMM: CVE-2026-1281 and CVE-2026-1340. The vendor has indicated that exploitation in the wild has already occurred prior to disclosure. This has been echoed by CISA who added...

Two Ivanti EPMM Zero-Day RCE Flaws Actively Exploited, Security Updates Released

Ivanti has rolled out security updates to address two security flaws impacting Ivanti Endpoint Manager Mobile EPMM that have been exploited in zero-day attacks, one of which has been added by the U.S. Cybersecurity and Infrastructure Security Agency CISA to its Known Exploited Vulnerabilities KEV...

Microsoft releases update to address zero-day vulnerability in Microsoft Office

Microsoft has published three out-of-band OOB updates so far in January 2026. One of these updates was released to address a vulnerability, CVE-2026-21509, affecting Microsoft Office that has been reportedly exploited in the wild. Additional OOB updates have been published to resolve operational...

CISA Adds One Known Exploited Vulnerability to Catalog

CISA has added one new vulnerability to its Known Exploited Vulnerabilities KEV Catalog, based on evidence of active exploitation. CVE-2026-1281link is external Ivanti Endpoint Manager Mobile EPMM Code Injection Vulnerability This type of vulnerability is a frequent attack vector for malicious...

CISA Adds One Known Exploited Vulnerability to Catalog

CISA has added one new vulnerability to its Known Exploited Vulnerabilities KEV Catalog, based on evidence of active exploitation. CVE-2026-24858link is external Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability This type of vulnerability is a...

ZeroDay vulnerability fixed in Microsoft Office

Microsoft has fixed a ZeroDay vulnerability in Microsoft Office. The vulnerability is in the way Microsoft Office handles untrusted input, which allows attackers to bypass security features locally. This can affect the integrity of security decisions made by the software. The reliance on untruste...

About Remote Code Execution – Microsoft Office (CVE-2026-21509) vulnerability

About Remote Code Execution - Microsoft Office CVE-2026-21509 vulnerability. The vulnerability was urgently fixed on January 26, outside the regular Microsoft Patch Tuesday. Microsoft classified it as a Security Feature Bypass, but in fact, it is more of a Remote Code Execution. The vulnerability...

What Is Hive Pro’s End-to-End CTEM Solution?

The difference between a good security program and a great one often comes down to context. Without it, a list of 10,000 vulnerabilities is just a list. But when you can see that three of those vulnerabilities are being actively exploited by a threat group targeting your industry, your priorities...

CISA Adds Five Known Exploited Vulnerabilities to Catalog

CISA has added five new vulnerabilities to its Known Exploited Vulnerabilities KEV Catalog, based on evidence of active exploitation. CVE-2018-14634link is external Linux Kernel Integer Overflow Vulnerability CVE-2025-52691link is external SmarterTools SmarterMail Unrestricted Upload of File with...

CVE-2023-40748

creationtimestamp| type| source ---|---|--- 2026-01-26 00:00:00+00:00| exploited| The Shadowserver honeypot/exploited-vulnerabilities - 2026-01-26 2026-01-27 21:03:03+00:00| seen| https://bsky.app/profile/beikokucyber.bsky.social/post/3mdgnthkkd42i 2026-02-04 00:00:00+00:00| exploited| The...

January Linux Patch Wednesday

JanuaryLinux Patch Wednesday. In January, Linux vendors started fixing 918 vulnerabilities, one and a half times more than in December. Of these, 616 are in the Linux Kernel. Three show signs of exploitation in the wild: 🔻 AuthBypass - GNU Inetutils telnetd CVE-2026-24061 🔻 RCE - Safari...