Exploitation attempts against critical Atlassian flaw have begun (CVE-2026-21589)

**Source : Help Net Security | 7 octobre 2026** One day after Atlassian released patches fixing a critical arbitrary file access vulnerability (CVE-2026-21589) in its self-managed Data Center products, and a few hours after watchTowr researchers published a technical rundown of the flaw, attackers have been spotted attempting to exploit it. CVE-2026-21589 PoC in action (Source: watchTowr) “Exploitation attempts have now started to hit our... 👉 **Lire l'article complet sur Help Net Security :** [https://www.helpnetsecurity.com/2026/10/07/exploitation-critical-atlassian-flaw-cve-2026-21589/](https://www.helpnetsecurity.com/2026/10/07/exploitation-critical-atlassian-flaw-cve-2026-21589/)