Affects Jenkins (widely used CI/CD). Low-privilege (Overall/Read) attackers can instantiate unexpected types, enabling config tampering and possible RCE — organization-wide impact.
CVE-2026-84647
Jenkins Stapler allows instantiation of arbitrary types via form binding
Is CVE-2026-84647 being exploited?
Not confirmed. CVE-2026-84647 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.43% probability of exploitation in the next 30 days.
How severe is CVE-2026-84647?
CVE-2026-84647 is rated High. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-84647?
Yes. A fix has been recorded for CVE-2026-84647. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-84647 affect?
CVE-2026-84647 affects Stapler <=2107.v8dfcb_e8ed317, Jenkins <=2.579, Jenkins LTS <=2.568.2. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-84647?
Upgrade to fixed Stapler/Jenkins releases and restrict Overall/Read permissions
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attackers with Overall/Read can instantiate arbitrary types via form data binding, enabling configuration manipulation and potential remote code execution.
Immediate action required