Affects Jenkins CI server; widely used across industries; enables RCE and impersonation via config.xml, potentially disrupting builds.
CVE-2026-53435
Jenkins deserialization flaw lets attackers impersonate users and run code via config.xml.
Is CVE-2026-53435 being exploited?
Not confirmed. CVE-2026-53435 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 53% probability of exploitation in the next 30 days.
How severe is CVE-2026-53435?
CVE-2026-53435 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-2026-53435?
Yes. A fix has been recorded for CVE-2026-53435. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-53435 affect?
CVE-2026-53435 affects Jenkins ≤2.567, LTS ≤2.555.2. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-53435?
Update Jenkins to latest release when available; review config.xml changes.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via Script Console; can read files; impersonate users and issue HTTP requests.
Patch when possible