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CVE-2026-84661 is an authorization flaw in Jenkins Pipeline: Build Step Plugin 599.v4b_67ea_11b_152 and earlier. The waitForBuild Pipeline step does not enforce the downstream job's Item/Cancel permission when its propagateAbort parameter is enabled. Consequently, a downstream build can be canceled through abort propagation even when the authentication associated with the build is not authorized to cancel builds on that downstream job.
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propagateAbort with waitForBuild where downstream cancellation must be restricted. Limit who can modify or execute affected Pipelines, and ensure job authorization boundaries prevent untrusted users from initiating builds that wait on sensitive downstream jobs.Patch, then assume compromise.
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4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A missing authorization check in Jenkins Pipeline: Build Step Plugin permits cancellation of downstream builds through the waitForBuild step with propagateAbort enabled, despite the caller lacking Item/Cancel permission for the downstream job.
A Jenkins plugin vulnerability referenced by the 2026-09-02 Jenkins security advisory; technical details are not provided.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.