Affects IBM App Connect Enterprise, a widely deployed enterprise integration product; allows remote arbitrary file write which can lead to code execution and widespread compromise.
CVE-2026-15435
Directory traversal in IBM App Connect allows remote arbitrary file write via crafted URL.
Is CVE-2026-15435 being exploited?
Not confirmed. CVE-2026-15435 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 0.50% probability of exploitation in the next 30 days.
How severe is CVE-2026-15435?
CVE-2026-15435 is rated Critical with a CVSS score of 9.8. 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-2026-15435?
Yes. A fix has been recorded for CVE-2026-15435. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-15435 affect?
CVE-2026-15435 affects IBM App Connect Enterprise 13.0.1.0 - 13.0.7.2, IBM App Connect Enterprise 12.0.1.0 - 12.0.12.27. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-15435?
Isolate instances, block external access, apply vendor patch/mitigation ASAP.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote arbitrary file write via crafted '/../' URL, enabling potential code execution, service compromise, or persistence.
Immediate action required
- affected>= 13.0.1.0 and <= 13.0.7.2
- affected>= 12.0.1.0 and <= 12.0.12.27
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.