Memory Corruption Vulnerability Discovered in Firefox and Thunderbird
Memory Corruption Vulnerability Discovered in Firefox and Thunderbird
Memory Corruption Vulnerability Discovered in Firefox and Thunderbird
Information:
Mozilla Firefox and Thunderbird are widely used open-source software applications. Firefox serves as a web browser known for its speed and strong focus on user privacy, while Thunderbird is an email and calendar client that offers flexible customization. Both applications share a common rendering engine and provide an Extended Support Release (ESR) version designed for organizations that require high system stability, along with long-term security updates.
Incident:
CVE-2026-6786 is a high-severity Memory Safety vulnerability affecting older versions of Mozilla Firefox and Thunderbird. The issue originates from improper memory handling within the rendering engine, falling under the category of Memory Corruption risks. If successfully exploited, it may lead to memory data corruption, potentially allowing attackers to execute arbitrary code remotely (Remote Code Execution: RCE) or cause the application to crash unexpectedly. This vulnerability poses a significant risk to both system security and stability.
Attack Method:
- Malicious Content: Attackers craft a webpage or email embedded with specially crafted scripts designed to deliver a payload targeting memory handling components.
- Access: When a user opens the link via Firefox or reads the email through a vulnerable version of Thunderbird, the rendering engine processes the content and triggers the flaw.
- Exploitation: This results in a Memory Corruption condition, allowing attackers to execute arbitrary commands with the same privileges as the current user.
Recommendation:
- Update Firefox and Thunderbird to version 150 or later.
- Update Firefox ESR to version 140.10 or later.
- Avoid clicking on suspicious links from untrusted emails or messages.
- Enable automatic updates to ensure the browser always receives the latest security patches.
The important things is Security systems. We must concern and monitor as usual.
For more information please contact
Email :sales@inetms.co.th
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063 204 4534 (Ms.Atsamaphorn)
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092 257 6902 (Ms.Narusorn)
063 197 7510 (Mr.Yanotai)
065 725 7405 (Ms.Nattharini)
065 725 7405 (Ms.Donraya)
References :
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-04/
- https://www.cve.org/CVERecord?id=CVE-2026-6786
Weekly Interesting CVE
| NO. |
CVE Name |
Published Date |
Last Update |
Device/Appplication/OS Target |
Attack Type |
CVSS |
Detail |
Solution |
Reference |
|---|---|---|---|---|---|---|---|---|---|
| 1 |
CVE-2026-6297 |
15/04/2026 |
16/04/2026 |
Google Chrome prior to 147.0.7727.101 |
Use After Free |
8.3 |
Use after free in Proxy in Google Chrome prior to 147.0.7727.101 allowed an attacker in a privileged network position to potentially perform a sandbox escape via a crafted HTML page. |
Upgrade to 147.0.7727.101 or later |
https://www.tenable.com/cve/CVE-2026-6297
|
| 2 |
CVE-2026-33825 |
15/04/2026 |
17/04/2026 |
Microsoft Defender Antimalware Platform Version 4.18.26020.6 |
Insufficient Granularity of Access Control |
7.8 |
Insufficient granularity of access control in Microsoft Defender allows an authorized attacker to elevate privileges locally. |
Upgrade to 4.18.26030.3011 |
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33825
|
| 3 |
CVE-2026-34621 |
11/04/2026 |
13/04/2026 |
Acrobat Reader versions 24.001.30356, 26.001.21367 and earlier |
Prototype Pollution |
8.6 |
Acrobat Reader versions 24.001.30356, 26.001.21367 and earlier are affected by an Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file. |
It is recommended to upgrade to the latest available version |
https://www.cvedetails.com/cve/CVE-2026-34621/
|
| 4 |
CVE-2026-35616 |
04/04/2026 |
06/04/2026 |
Fortinet FortiClientEMS 7.4.5 through 7.4.6 |
Improper Access Control |
9.8 |
A improper access control vulnerability in Fortinet FortiClientEMS 7.4.5 through 7.4.6 may allow an unauthenticated attacker to execute unauthorized code or commands via crafted requests. |
- FortiClientEMS 7.4 Upgrade to upcoming 7.4.7 or above |
|
| 5 |
CVE-2026-32201 |
14/04/2026 |
14/04/2026 |
Microsoft SharePoint |
Improper Input Validation |
6.5 |
Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network. |
- Microsoft SharePoint Server Subscription Edition Update to 16.0.19725.20210 |
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32201
|
Malware News or Campaign IOC/IOA | EN
|
No |
Campaign Name |
Detection Date |
Attack Type |
Description |
Mitigation/Remediation |
|---|---|---|---|---|---|
| 1 |
Anthropic MCP Design Vulnerability Enables RCE |
20/04/2026 |
Remote Code Execution (RCE), Command Injection, Prompt Injection |
Security researchers have discovered a critical vulnerability in Anthropic's Model Context Protocol (MCP), a standard used for AI to connect to external tools and systems. This is a design flaw, not a common bug, allowing hackers to directly execute commands on the system (Remote Code Execution). The vulnerability affects a wide range of applications, impacting over 7,000 servers and related software with over 150 million downloads, including several popular AI tools like LangChain and LiteLLM. Researchers have identified a default MCP configuration that allows for various forms of command injection and have issued at least 10 CVEs (Common Vulnerabilities and Exposures) for affected projects. |
|
Ref:https://www.scworld.com/brief/android-banking-trojan-linked-to-forced-labor-scam-compounds
05 May 2026
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