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CVE.org (no NVD analysis yet)· CNA atlassian

CVE-2026-21589: This is a vulnerability in Bitbucket Data Center, Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Ba

Noroxi assessment

Priority: Now (action score 97/100)

  • CISA has confirmed exploitation in the wild (Oct 15, 2026). Remediation deadline for US federal agencies: Oct 18, 2026.
  • A ready-made attack module is public (Nuclei); exploiting it takes no special expertise.
  • Probability of exploitation in the next 30 days: 99.6% (FIRST EPSS); higher than 99.9% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to the record, no fixed version is available yet.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Patch today or shut off access. Until a fix is released, restrict access to the affected component and follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

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.

CriticalCVSS 9.3 · v4.0KEVWeaponized No fix recorded
Published
Oct 5, 2026
Updated
Oct 29, 2026
EPSS
99.6% · 99th percentile

Report tools

JSON

Action score

97

Now

Patch today or shut off access.

CVSS
37 / 40 · 9.3 / 10
CISA KEV
30 / 30 · Listed
EPSS
30 / 30 · 99.6%

CISA SSVC decision

Exploitation
active
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · atlassian
9.3
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Oct 15, 2026. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Oct 18, 2026.

Get told when this record changes

  • In CISA KEV: exploitation in the wild confirmed
  • Weaponized exploit exists
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-21589

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
atlassianbitbucket data center
atlassianbitbucket server
atlassianconfluence data center
atlassiancrowd
atlassianjira data center
atlassianjira service desk
atlassianjira service management
atlassianbamboo
atlassiancrucible
atlassianfisheye

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • atlassian bamboo7.0.1 and later · before 10.2.24
  • atlassian bamboo11.0.0 and later · before 12.1.12
  • atlassian bitbucket data center10.3.0 and later · before 10.5.1
  • atlassian bitbucket data center7.17.0 and later · before 9.4.26
  • atlassian bitbucket data center9.5.0 and later · before 10.2.8
  • atlassian bitbucket server4.6.0 and later · up to 8.14.6 inclusive
  • atlassian confluence data center9.3.0 and later · before 10.2.19
  • atlassian confluence data center5.10.0 and later · before 9.2.26
  • atlassian crowd7.1.0 and later · before 7.1.7
  • atlassian crowd7.2.0 and later · before 7.2.4
  • atlassian crowd2.11.0 and later · before 6.3.7
  • atlassian crowd7.0.0 and later · before 7.0.3
  • atlassian cruciblebefore 4.9.15
  • atlassian fisheyebefore 4.9.15
  • atlassian jira data center10.4.0 and later · before 11.3.12
  • atlassian jira data center7.1.0 and later · before 9.12.40
  • atlassian jira data center9.13.0 and later · before 10.3.26
  • atlassian jira service desk3.1.0 and later · up to 4.13.27 inclusive
  • atlassian jira service management4.14.0 and later · before 5.12.40
  • atlassian jira service management10.4.0 and later · before 11.3.12

Versions reported by the vendor

Affected version ranges reported by the assigning authority (atlassian). Independent of NVD's CPE analysis and usually ahead of it.

  • Atlassian Bamboo Data Center

    • Patch version 10.2.24 and later, Patch version 12.1.12 and laternot affected
    • All other versionsaffected

  • Atlassian Bitbucket Data Center

    • Patch version 10.2.8 and later, Patch version 10.5.1 and later, Patch version 9.4.26 and laternot affected
    • All other versionsaffected

  • Atlassian Confluence Data Center

    • Patch version 10.2.19 and later, Patch version 9.2.26 and laternot affected
    • All other versionsaffected

  • Atlassian Crowd Data Center

    • Patch version 7.2.4 and later, Patch version 7.1.7 and later, Patch version 7.0.3 and later, Patch version 6.3.7 and laternot affected
    • All other versionsaffected

  • Atlassian Crucible Data Center

    • Patch version 4.9.15 and laternot affected
    • All other versionsaffected

  • Atlassian Fisheye Data Center

    • Patch version 4.9.15 and laternot affected
    • All other versionsaffected

  • Atlassian Jira Service Management Data Center

    • Patch version 11.3.12 and later, Patch version 10.3.26 and later, Patch version 5.12.40 and laternot affected
    • All other versionsaffected

  • Atlassian Jira Software Data Center

    • Patch version 11.3.12 and later, Patch version 10.3.26 and later, Patch version 9.12.40 and laternot affected
    • All other versionsaffected

Same product

atlassian: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-26133SharedSecretClusterAuthenticator in Atlassian Bitbucket Data Center versions 5.14.0 and later before 7.6.14, 7.7.0 and later prior to 7.17.6
    60This week
  • CVE-2023-22513This High severity RCE (Remote Code Execution) vulnerability was introduced in version 8.0.0 of Bitbucket Data Center and Server.
    40Plan
  • CVE-2024-21684There is a low severity open redirect vulnerability within affected versions of Bitbucket Data Center.
    17Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Nuclei detection template ×1
  • Proof-of-concept repository on GitHub ×13

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Nuclei detection templateNuclei template CVE-2026-21589 —
Proof-of-concept repository on GitHubstars:152026-10-06
Proof-of-concept repository on GitHubstars:92026-10-06
Proof-of-concept repository on GitHubstars:112026-10-06
Proof-of-concept repository on GitHubstars:02026-10-07
Proof-of-concept repository on GitHubstars:02026-10-07
Proof-of-concept repository on GitHubstars:02026-10-07
Proof-of-concept repository on GitHubstars:72026-10-07
Proof-of-concept repository on GitHubstars:02026-10-08
Proof-of-concept repository on GitHubstars:12026-10-08
Proof-of-concept repository on GitHubstars:02026-10-08
Proof-of-concept repository on GitHubstars:12026-10-09

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoCsame day
  3. CISA KEV+9 d
  4. TodayNov 7, 2026+33 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-552 · Files or Directories Accessible to External Parties

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. StateREJECTED → PUBLISHED
  2. StatePUBLISHED → REJECTED
  3. SSVC exploitationpoc → active
  4. Exploit maturitypoc → weaponized
  5. KEV✗ → ✓
  6. SSVC exploitationnone → poc
  7. Exploit maturitynone → poc
  8. SSVC exploitation— → none
  9. Exploit maturity— → none

For records you follow, these changes also arrive as notifications. →

References

Show all references (9 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records