Critical Bamboo Data Centre and Server Flaw Enables Command Injection Attacks - gbhackers.com

CVE/vulnerabilityCyber Security NewsVulnerabilities 3 min.Read Critical Bamboo Data Centre and Server Flaw Enables Command Injection Attacks By Divya April 22, 2026 Share Facebook Twitter Pinterest WhatsApp Atlassian has disclosed a critical OS Command Injection vulnerability (CVE-2026-21571) in Bamboo Data Centre and Server, with a CVSS score of 9.4, enabling authenticated attackers to execute commands on affected systems remotely. The flaw, tracked as CVE-2026-21571, was published as part of Atlassian’s April 21, 2026, Security Bulletin, the company’s monthly disclosure of patched vulnerabilities across its enterprise product suite. According to the National Vulnerability Database, the vulnerability was introduced across multiple Bamboo Data Center release branches, including versions 9.6.0, 10.0.0, 10.1.0, 10.2.0, 11.0.0, 11.1.0, 12.0.0, and 12.1.0. Atlassian notes that this is a vulnerability originating in a non-Atlassian third-party dependency and states that its own application of the dependency presents a lower, non-critical risk. However, the raw CVSS score of 9.4 still classifies the flaw as Critical. Technical Details The vulnerability carries a CVSS v4.0 vector of AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H, meaning it is network-exploitable, with low attack complexity and requiring only low-level authentication, with no user interaction needed. Successful exploitation gives an attacker the ability to inject and execute arbitrary OS-level commands on the remote system, resulting in: High impact to confidentiality – sensitive build and deployment data can be exfiltrated High impact to integrity – CI/CD pipelines and artifacts can be tampered with High impact on availability – server operations can be disrupted or shut down Because Bamboo is a widely used Continuous Integration/Continuous Delivery (CI/CD) platform, a successful exploit could allow attackers to inject malicious code directly into automated build and deployment workflows, potentially compromising entire software supply chains. Affected Versions The following Bamboo Data Center and Server versions are confirmed vulnerable: Atlassian strongly recommends upgrading to the following fixed versions immediately: Bamboo Data Center 12.1.x → Upgrade to 12.1.6 (LTS) or later (Data Center only) Bamboo Data Center 10.2.x → Upgrade to 10.2.18 (LTS) or later (Data Center only) Bamboo Data Center 9.6.x → Upgrade to 9.6.25 or later Organizations unable to upgrade immediately should consult Atlassian’s Vulnerability Disclosure Portal to verify their specific product version exposure. CVE-2026-21571 is one of 38 total vulnerabilities addressed in Atlassian’s April 2026 Security Bulletin – including 31 high-severity and 7 critical-severity flaws across Bamboo, Confluence, Bitbucket, Jira Software, and Jira Service Management. Other notable critical flaws in this bulletin include: CVE-2024-47875 (CVSS 10.0) – mutation Cross-Site Scripting (mXSS) via DOMPurify dependency in Jira Software and Jira Service Management Data Center CVE-2022-1471 (CVSS 9.8) – Remote Code Execution via SnakeYAML dependency in Confluence and Jira Service Management Data Center CVE-2026-25547 (CVSS 9.2) – Denial of Service via brace-expansion dependency in Jira Software Data Center Atlassian clarifies that CVEs published through its monthly Security Bulletins are assessed as presenting non-immediate, non-critical risk in the context of how its products use the affected components, and that Critical Security Advisories are issued separately for vulnerabilities posing an immediate threat. Security and DevOps teams running Bamboo Data Center or Server should take the following actions: Immediately audit all deployed Bamboo versions against the affected version list Apply the recommended patches – upgrade to 12.1.6 (LTS), 10.2.18 (LTS), or 9.6.25 as applicable Review CI/CD pipeline configurations for signs of unauthorized modifications or injected commands Monitor authentication logs for anomalous low-privilege user activity targeting build agents Check the Vulnerability Disclosure Portal at atlassian.com for the most current fixed version guidance Given Bamboo’s role in software delivery pipelines, unpatched instances represent a significant supply chain risk for enterprises operating in multi-team DevOps environments. Follow us on Google News, LinkedIn, and X to Get Instant Updates and Set GBH as a Preferred Source in Google. Tags cyber security Cyber Security News Vulnerability Divya Divya is a Senior Journalist at GBhackers covering Cyber Attacks, Threats, Breaches, Vulnerabilities and other happenings in the cyber world. Hot this week Infosec- Resources How To Access Dark Web Anonymously and know its Secretive and Mysterious Activities June 4, 2023 1 What is Deep Web The deep web, invisible web, or... SOC Architecture How to Build and Run a Security Operations Center (SOC Guide) – 2023 June 3, 2023 12 Today’s Cyber security operations center (CSOC) should have everything... Cyber Security News Russian Hackers Bypass EDR to Deliver a Weaponized TeamViewer Component October 18, 2023 0 TeamViewer's popularity and remote access capabilities make it an... Checklist Web Server Penetration Testing Checklist – 2026 January 6, 2026 0 Web server pentesting is performed under three significant categories: identity,... 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