Exploitation active confirmée

Ajoutée au catalogue CISA KEV le 15/10/2026, correctif exigé avant le 18/10/2026 pour les agences fédérales américaines.

Action requise : Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Description officielle (NVD)

This is a vulnerability in 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. 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 some sensitive files that make this highly severe. This vulnerability allows an unauthenticated remote attacker to access specific files within the web application root directory in affected versions. The vulnerability must be addressed for affected versions of: -- Bitbucket Data Center, introduced in version >= 4.6.0, fix versions: 9.4.26, 10.2.8, 10.5.1 -- Confluence Data Center, introduced in version >= 5.10.0, fix versions 9.2.26, 10.2.19 -- Crowd Data Center, introduced in version >= 2.11.0, fix versions 6.3.7, 7.0.3, 7.1.7, 7.2.4 -- Jira Software Data Center, introduced in version >= 7.1.0, fix versions 9.12.40, 10.3.26, 11.3.12 -- Jira Service Management Data Center, introduced in version >= 3.1.0, fix versions 5.12.40, 10.3.26, 11.3.12 -- Bamboo Data Center >= 7.0.1, fix versions 10.2.24, 12.1.12 -- Crucible, fix versions 4.9.15 -- Fisheye, fix version 4.9.15 -- Exploitation requires prior knowledge of the target file's exact name and path. The vulnerability does not include the capability to enumerate or list directory contents.

Preuves de concept publiques (12)

Dépôts tiers non vérifiés, parfois piégés. Ne les exécutez jamais en production : uniquement dans un environnement de test isolé.

watchtowrlabs/watchTowr-vs-Atlassian-CVE-2026-21589 · ★ 15 · 06/10/2026
tc4dy/CVE-2026-21589-PoC-Exploit · ★ 11 · 06/10/2026
CVE-2026-21589 - Atlassian Data Center Unauth Arbitrary File Read (CVSS 9.3). Red/Blue Team suite with 2 tools: Full Exploit (path traversal, WEB-INF read, interactive shell, 8 products, mass scan, SO
MarcusProgram/CVE-2026-21589 · ★ 9 · 06/10/2026
ynsmroztas/AtlasSniper · ★ 7 · 07/10/2026
CVE-2026-21589 detector for Atlassian Data Center webresource traversal. Pre-auth webroot file read confirm for Jira, Confluence and Bitbucket.
murrez/CVE-2026-21589 · ★ 1 · 08/10/2026
CVE-2026-21589 — Atlassian DC pre-auth arbitrary file read (CVSS 4.0 9.3). PoCbit PoC: atlassian-plugins-webresource ..:: traversal on /download/resources/ for Jira, Confluence, Bitbucket. check + exp
gotr00t0day/CVE-2026-21589 · ★ 1 · 09/10/2026
Atlassian Arbitrary File Read
aduli198/CVE-2026-21589 · ★ 0 · 07/10/2026
Atlassian Arbitrary File Read
BimBoxH4/CVE-2026-21589 · ★ 0 · 07/10/2026
0xBlackash/CVE-2026-21589 · ★ 0 · 07/10/2026
CVE-2026-21589
rxsklife/CVE-2026-21589 · ★ 0 · 08/10/2026
CVE-2026-21589 is a critical (CVSS 9.3) arbitrary file access vulnerability affecting all versions of eight Atlassian Data Center products, including Jira, Confluence, Bitbucket, Bamboo, Crowd, Crucib

Les 10 dépôts les plus suivis sont affichés.

Références

https://jira.atlassian.com/browse/BAM-26567 — Issue Tracking, Mitigation, Vendor Advisory
https://jira.atlassian.com/browse/BSERV-20604 — Issue Tracking, Mitigation, Vendor Advisory
https://jira.atlassian.com/browse/CONFSERVER-104488 — Issue Tracking, Mitigation, Vendor Advisory
https://jira.atlassian.com/browse/CRUC-8741 — Issue Tracking, Mitigation, Vendor Advisory
https://jira.atlassian.com/browse/CWD-6610 — Issue Tracking, Mitigation, Vendor Advisory
https://jira.atlassian.com/browse/FE-7583 — Issue Tracking, Mitigation, Vendor Advisory
https://jira.atlassian.com/browse/JRASERVER-79546 — Issue Tracking, Mitigation, Vendor Advisory
https://jira.atlassian.com/browse/JSDSERVER-16809 — Issue Tracking, Mitigation, Vendor Advisory
https://github.com/watchtowrlabs/watchTowr-vs-Atlassian-CVE-2026-21589 — Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21589 — US Government Resource

En bref

Éditeur	Atlassian
Produit	Multiple Products
Publiée le	05/10/2026
Modifiée le	19/10/2026
CVSS	9.3 (v4.0)
EPSS	12,71 % (centile 96)
CWE	CWE-552

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS : probabilité estimée d'exploitation dans les 30 prochains jours.

Produits concernés

atlassian · bitbucket_data_center atlassian · bitbucket_server atlassian · confluence_data_center atlassian · crowd atlassian · jira_data_center atlassian · jira_service_desk atlassian · jira_service_management atlassian · bamboo atlassian · crucible atlassian · fisheye