CVE-2026-21589: Atlassian multiple products (Data Center)

1. A public proof of concept: not reached

2. A nuclei template that exploits rather than only fingerprints: not reached

3. A merged Metasploit module: not reached

4. Exploitation attempts reported by a named party: not reached

Reported, not established

• Atlassian (CONFSERVER-104488) contradicted

  third-party text, as Pulse recorded it
  Affected Atlassian Cloud products have been patched, and our investigation has not found any evidence of exploitation. No Cloud customer action is required.

  Pulse: The vendor on its Cloud products; KEV lists the flaw as exploited. The statement covers Cloud, not Data Center.
  capture pulse: raw/au/security-vendor/atlassian/confserver-104488/20261022T221133Z/text.txt, 22 October 2026, 22:11 UTC, sha256 db843633e64f4cc8 original

5. A KEV listing (the date added): reached 2026-10-15

• Pulse's own check 2026-10-15
  KEV catalog 2026.10.21
  capture pulse: raw/us/registry/cisa-kev/kev-json/20261022T221059Z/text.txt, 22 October 2026, 22:10 UTC, sha256 97336b5231c74981 original

6. knownRansomwareCampaignUse: Known on KEV: not reached

7. A national CERT reporting compromises in its country: not reached

8. A named organisation saying it was compromised through that flaw: not reached

a victim's own statement is recorded by hand from a capture; none recorded