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Threat actors have begun to exploit a newly disclosed critical security flaw impacting Atlassian Data Center products that could allow access to sensitive files under certain conditions. The arbitrary file access flaw, tracked as CVE-2026-21589 (CVSS score: 9.3) affects multiple products, including Bitbucket Data Center, Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center, Crowd Data Center, Crucible, and Fisheye. "This arbitrary file access vulnerability allows an unauthenticated attacker to access specific files within the web application root directory in affected versions," the Australian company said. "Exploitation requires prior knowledge of the target file's exact name and path; this vulnerability does not allow attackers to enumerate or list directory contents. In some configurations, there may be sensitive files present that increase your risk." Atlassian said impacted Atlassian Cloud pro...

Cybersecurity researchers on Wednesday disclosed critical flaws in the Atlassian project and software development platform that could be exploited to take over an account and control some of the apps connected through its single sign-on ( SSO ) capability. "With just one click, an attacker could have used the flaws to get access to Atlassian's publish Jira system and get sensitive information, such as security issues on Atlassian cloud, Bitbucket and on premise products," Check Point Research said in an analysis shared with The Hacker News. After the issues were reported to Atlassian on Jan. 8, 2021, the Australian company deployed a fix as part of its  updates  rolled out on  May 18 . The sub-domains affected by the flaws include -  jira.atlassian.com confluence.atlassian.com getsupport.atlassian.com partners.atlassian.com developer.atlassian.com support.atlassian.com training.atlassian.com Successful exploitation of these flaws could result in a supp...

More than a decade ago, the concept of the  ‘blameless’  postmortem changed how tech companies recognize failures at scale. John Allspaw, who coined the term during his tenure at Etsy, argued postmortems were all about controlling our natural reaction to an incident, which is to point fingers: “One option is to assume the single cause is incompetence and scream at engineers to make them ‘pay attention!’ or ‘be more careful!’ Another option is to take a hard look at how the accident actually happened, treat the engineers involved with respect, and learn from the event.” What can we, in turn, learn from some of the most honest and blameless—and public—postmortems of the last few years? GitLab: 300GB of user data gone in seconds What happened : Back in 2017, GitLab experienced a painful 18-hour outage. That story, and GitLab’s subsequent honesty and transparency, has significantly impacted how organizations handle data security today. The incident began when GitLab’s second...

The cyber threat space doesn’t pause, and this week makes that clear. New risks, new tactics, and new security gaps are showing up across platforms, tools, and industries — often all at the same time. Some developments are headline-level. Others sit in the background but carry long-term impact. Together, they shape how defenders need to think about exposure, response, and preparedness right now. This edition of ThreatsDay Bulletin brings those signals into one place. Scan through the roundup for quick, clear updates on what’s unfolding across the cybersecurity and hacking landscape. Privacy model hardening Google Showcases New Privacy and Security Features in Android 17 Google announced the first beta version of Android 17 , with two privacy and security enhancements: the deprecation of Cleartext Traffic Attribute and support for HPKE Hybrid Cryptography to enable secure communication using a combination of public key and symme...