CVE-2026-84648
Stored XSS in Jenkins log viewer allows script execution via agent-controlled metadata
Is CVE-2026-84648 being exploited?
Not confirmed. CVE-2026-84648 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 0.44% probability of exploitation in the next 30 days.
How severe is CVE-2026-84648?
CVE-2026-84648 is rated High with a CVSS score of 8.8. 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-2026-84648?
Yes. A fix has been recorded for CVE-2026-84648. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-84648 affect?
CVE-2026-84648 affects 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-2026-84648?
Upgrade Jenkins per advisory; restrict/untrust agents and sanitize/clear logs
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Stored XSS lets attacker-controlled agents execute JavaScript in Jenkins UI, enabling session theft, credential exposure, or perform admin actions.
Immediate action required