CVE-2022-26133
Published: 20 April 2022
Summary
CVE-2022-26133 is a critical-severity Deserialization of Untrusted Data (CWE-502) vulnerability in Atlassian Bitbucket Data Center. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 0.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2022-26133 is a Java deserialization vulnerability (CWE-502) in the SharedSecretClusterAuthenticator component of Atlassian Bitbucket Data Center. It affects 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. The flaw carries a CVSS 3.1 score of 9.8 and stems from unsafe handling of serialized objects, commonly tied to an embedded Hazelcast instance.
A remote unauthenticated attacker can send a crafted serialized payload over the network to trigger arbitrary code execution on the Bitbucket server, achieving full confidentiality, integrity, and availability impact without any user interaction or credentials.
Atlassian security advisories reference the underlying Hazelcast issue (CVE-2016-10750) and direct administrators to upgrade Bitbucket Data Center to one of the fixed releases listed in the Jira ticket BSERV-13173; the advisories also recommend reviewing cluster authentication configurations and applying vendor patches promptly. The EPSS score has reached 0.8139, indicating substantial exploitation interest.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2022-30700
Vulnerability details
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…
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code via Java deserialization.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing supplies malicious serialized objects, detecting unsafe deserialization and supporting corrective actions.
Evaluation of untrusted data handling (deserialization testing) reveals unsafe processing, which the required remediation process addresses.
Untrusted serialized data can be deserialized and observed inside the chamber, blocking gadget-chain exploitation outside the sandbox.
Validates or rejects untrusted serialized data before deserialization occurs.
Identifies and blocks malicious code introduced through deserialization of untrusted data at system boundaries.
Integrity verification of serialized information can detect tampering before deserialization occurs.
Provenance of associated data allows detection of untrusted sources before deserialization or processing occurs.