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December Patch Tuesday fixes three zero-days, including one that hijacks Windows devices

The update patches three zero-days and introduces a new PowerShell warning meant to help you avoid accidentally running unsafe code from the web.

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#vulnerability#web#windows#microsoft#git#rce#auth#zero_day
GHSA-6hjr-v6g4-3fm8: ImageMagick is vulnerable to an integer Overflow in TIM decoder leading to out of bounds read (32-bit only)

### Summary The TIM (PSX TIM) image parser in ImageMagick contains a critical integer overflow vulnerability in the `ReadTIMImage` function (`coders/tim.c`). The code reads `width` and `height` (16-bit values) from the file header and calculates `image_size = 2 * width * height` without checking for overflow. On 32-bit systems (or where `size_t` is 32-bit), this calculation can overflow if `width` and `height` are large (e.g., 65535), wrapping around to a small value. This results in a small heap allocation via `AcquireQuantumMemory` and later operations relying on the dimensions can trigger an out of bounds read. ### Vulnerable Code File: `coders/tim.c` ```c width=ReadBlobLSBShort(image); height=ReadBlobLSBShort(image); image_size=2*width*height; // Line 234 - NO OVERFLOW CHECK! ``` ### Impact This vulnerability can lead to Arbitrary Memory Disclosure due to an out of bounds read on 32-bit systems.

GHSA-7vpr-jm38-wr7w: XWiki vulnerable to a reflected XSS via xredirect parameter in DeleteApplication

### Impact A reflected XSS vulnerability in XWiki allows an attacker to send a victim to a URL with a deletion confirmation message on which the attacker-supplied script is executed when the victim clicks the "No" button. When the victim has admin or programming right, this allows the attacker to execute basically arbitrary actions on the XWiki installation including remote code execution. ### Patches This vulnerability has been patched in XWiki 16.10.10, 17.4.2 and 17.5.0 by using the affected URL parameter only in the intended context. ### Workarounds The [patch](https://github.com/xwiki/xwiki-platform/commit/cb578b1b2910d06e9dd7581077072d1cfbd280f2) can be manually applied to the templates that are present in the WAR. A restart of XWiki is needed for the changes to be applied.

GHSA-mq8m-42gh-wq7r: Gogs vulnerable to a bypass of CVE-2024-55947

Improper Symbolic link handling in the PutContents API in Gogs allows Local Execution of Code.

Three PCIe Encryption Weaknesses Expose PCIe 5.0+ Systems to Faulty Data Handling

Three security vulnerabilities have been disclosed in the Peripheral Component Interconnect Express (PCIe) Integrity and Data Encryption (IDE) protocol specification that could expose a local attacker to serious risks. The flaws impact PCIe Base Specification Revision 5.0 and onwards in the protocol mechanism introduced by the IDE Engineering Change Notice (ECN), according to the PCI Special

GHSA-rg58-xhh7-mqjw: Apache Struts has a Denial of Service vulnerability

Denial of Service vulnerability in Apache Struts, file leak in multipart request processing causes disk exhaustion. This issue affects Apache Struts: from 2.0.0 through 6.7.4, from 7.0.0 through 7.0.3. Users are recommended to upgrade to version 6.8.0 or 7.1.1, which fixes the issue.

Warning: WinRAR Vulnerability CVE-2025-6218 Under Active Attack by Multiple Threat Groups

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Tuesday added a security flaw impacting the WinRAR file archiver and compression utility to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation. The vulnerability, tracked as CVE-2025-6218 (CVSS score: 7.8), is a path traversal bug that could enable code execution. However, for exploitation

Webinar: How Attackers Exploit Cloud Misconfigurations Across AWS, AI Models, and Kubernetes

Cloud security is changing. Attackers are no longer just breaking down the door; they are finding unlocked windows in your configurations, your identities, and your code. Standard security tools often miss these threats because they look like normal activity. To stop them, you need to see exactly how these attacks happen in the real world. Next week, the Cortex Cloud team at Palo Alto Networks

GHSA-6q37-7866-h27j: Keycloak Admin REST (Representational State Transfer) API does not properly enforce permissions

A flaw was found in Keycloak Admin REST (Representational State Transfer) API. This vulnerability allows information disclosure of sensitive role metadata via insufficient authorization checks on the /admin/realms/{realm}/roles endpoint.

Microsoft Issues Security Fixes for 56 Flaws, Including Active Exploit and Two Zero-Days

Microsoft closed out 2025 with patches for 56 security flaws in various products across the Windows platform, including one vulnerability that has been actively exploited in the wild. Of the 56 flaws, three are rated Critical, and 53 are rated Important in severity. Two other defects are listed as publicly known at the time of the release. These include 29 privilege escalation, 18 remote code