Critical

CISA orders feds to patch Zimbra XSS flaw exploited in attacks

BleepingComputer

March 18, 2026 at 7:57 PM

Actively Exploited

Overview

The Cybersecurity and Infrastructure Security Agency (CISA) has directed U.S. federal agencies to address a vulnerability in the Zimbra Collaboration Suite (ZCS) that is currently being exploited in the wild. This flaw allows for cross-site scripting attacks, which can enable attackers to execute malicious scripts in the context of a user's session. Affected organizations need to act quickly to secure their servers to prevent unauthorized access and data breaches. The urgency of this directive underscores the importance of maintaining up-to-date security practices, especially for government entities that handle sensitive information. Users of ZCS should ensure their systems are patched as soon as possible to mitigate the risk posed by this vulnerability.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: Zimbra Collaboration Suite (ZCS)
Action Required: CISA has recommended that organizations immediately apply available security patches for the Zimbra Collaboration Suite to mitigate the risk of exploitation.
Timeline: Newly disclosed

Original Article Summary

CISA has ordered U.S. government agencies to secure their servers against an actively exploited vulnerability in the Zimbra Collaboration Suite (ZCS). [...]

Impact

Zimbra Collaboration Suite (ZCS)

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

CISA has recommended that organizations immediately apply available security patches for the Zimbra Collaboration Suite to mitigate the risk of exploitation. Specific patch numbers or versions were not mentioned in the article, so organizations should refer to Zimbra's official resources for the latest updates.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Vulnerability, Patch, XSS.

Read Original Article

Related Coverage

U.S. CISA adds Linux Kernel flaws to its Known Exploited Vulnerabilities catalog

Security Affairs

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added several vulnerabilities in the Linux Kernel to its Known Exploited Vulnerabilities catalog. This update indicates that these flaws have been identified as actively exploited in the wild, posing risks to various systems that rely on the Linux operating system. While specific details on the nature of the exploits are not currently available, the inclusion of these vulnerabilities in the catalog signals a need for immediate attention from system administrators and security teams. Users and organizations utilizing affected Linux versions should prioritize patching their systems to mitigate potential attacks, as these vulnerabilities could be leveraged by attackers for unauthorized access or other malicious activities. Staying updated with the latest patches is crucial for maintaining system security.

Sep 20, 2026

Malicious npm packages evade install-script defenses at runtime

BleepingComputer

A new malware campaign is targeting users of the npm package manager, specifically through a malicious package named 'indexed-btree'. Unlike traditional attacks that insert harmful code into installation scripts, this campaign cleverly embeds malicious behavior within the normal runtime operations of the package. This method allows attackers to bypass common security defenses that monitor installation scripts. As a result, developers who unknowingly install this package could face serious security risks, including potential data breaches or system compromise. It’s crucial for developers to be vigilant and scrutinize the packages they use, as traditional safeguards may not catch these types of attacks.

Sep 20, 2026

AI Hallucinations Nearly Triggered a US-China Military Confrontation

Security Affairs

An AI-generated intelligence report nearly escalated tensions between the US and China during the Iran war by falsely claiming that a Chinese ship was transporting nuclear weapons components. According to sources cited by CNN, this misleading report circulated among US military officials, prompting discussions about a potential military operation in response. Fortunately, the situation was defused before any action was taken. This incident raises serious concerns about the reliability of AI in military intelligence and the potential for misinformation to provoke international conflict. As AI technology becomes more integrated into defense systems, ensuring accuracy and accountability in its outputs is crucial to prevent dangerous misunderstandings.

Sep 20, 2026

SECURITY AFFAIRS MALWARE NEWSLETTER ROUND 115

Security Affairs

The latest Malware Newsletter from Security Affairs reveals several significant cybersecurity threats. One incident involves a malicious browser extension targeting Twitch users, which has exposed OAuth tokens of around 30,000 individuals to Russian bots. Another report details a campaign called 'Red Heron' that exploits a known vulnerability in Gitea, allowing attackers to deploy a new Linux rootkit. Additionally, researchers discuss a one-click backdoor known as 'Gray Rabbits' that poses risks to systems. These incidents underscore the growing sophistication of malware and the need for users and organizations to remain vigilant against such threats.

Sep 20, 2026

Researchers escape OpenAI Codex sandbox to run commands on host

BleepingComputer

Researchers have successfully escaped the sandbox environment of OpenAI's Codex, allowing them to execute commands on a developer's machine. They achieved this through two different methods, even when operating in the most restricted mode of the Codex. OpenAI has since addressed these vulnerabilities with patches. This incident raises concerns about the security of AI development environments and the potential risks they pose if exploited by malicious actors. Developers using Codex should be aware of these vulnerabilities and ensure they are using the latest patched versions to mitigate risks.

Sep 20, 2026

Week in review: Cisco patches exploited email gateway 0-day, Revolut breach

Help Net Security

Last week, Revolut confirmed a data breach involving sensitive customer records. The breach occurred when an attacker impersonated a government agency, using an email address from that agency's domain to gain unauthorized access to the bank's systems. This incident raises significant concerns about the security of customer data and the effectiveness of identity verification processes in preventing such impersonation attacks. Meanwhile, Cisco released a patch for a zero-day vulnerability in its email gateway that had been actively exploited. This highlights ongoing challenges in cybersecurity, where organizations must remain vigilant against both social engineering tactics and technical vulnerabilities.

Sep 20, 2026