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CVE-2026-15435: IBM App Connect Enterprise 13.0.1.0 through 13.0.7.2, and 12.0.1.0 through 12.0.12.27 could allow a remote att

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CRITICAL 9.8REMOTEUPGRADE

CVE-2026-15435 is a critical-severity flaw (CVSS 9.8) affecting app connect enterprise. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM App Connect Enterprise 13.0.1.0 through 13.0.7.2, and 12.0.1.0 through 12.0.12.27 could allow a remote attacker to traverse directories on the system. An attacker could send a specially crafted URL request containing "dot dot" sequences (/../) to write arbitrary files on the system.

Why this priority

  • Critical severity
  • CISA SSVC: automatable with total technical impact
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score9.8 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.7% (top 46%)
CISA exploited listNo
WeaknessCWE-22
Published2026-07-30
Last modified2026-10-23
Publisher (CNA): IBM Corporation · Vendor: ibm

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

ibm app connect enterprise UPGRADE
Affected: >= 12.0.1.0 and < 12.0.12.28 · >= 13.0.1.0 and < 13.0.8.0
Fixed in: 12.0.12.28, 13.0.8.0
Safe to downgrade to: a release before 12.0.1.0
1. Check installed version
apt-cache policy app-connect-enterprise || rpm -q app-connect-enterprise || app-connect-enterprise --version
2. UPGRADE to 12.0.12.28 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade app-connect-enterprise
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade app-connect-enterprise
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 12.0.1.0 (Debian / Ubuntu)
apt-cache madison app-connect-enterprise sudo apt install app-connect-enterprise=<VERSION_BEFORE_12.0.1.0> sudo apt-mark hold app-connect-enterprise
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list app-connect-enterprise sudo dnf downgrade app-connect-enterprise-<VERSION_BEFORE_12.0.1.0> sudo dnf versionlock add app-connect-enterprise
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora 46 · pspp · FIXED · 2.1.3-2.fc46 · FEDORA-2026-0d6444911b · source
sudo dnf upgrade --advisory=FEDORA-2026-0d6444911b
Fedora ELN · barman · FIXED · 3.20.1-3.eln159 · FEDORA-2026-45ecf042c2 · source
sudo dnf upgrade --advisory=FEDORA-2026-45ecf042c2
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-15435?

app connect enterprise: upgrade to 12.0.12.28, 13.0.8.0. Exact commands for each OS are on this page.

Is CVE-2026-15435 being exploited?

CVE-2026-15435 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-15435 affect?

CVE-2026-15435 affects app connect enterprise. Severity is critical (CVSS 9.8). IBM App Connect Enterprise 13.0.1.0 through 13.0.7.2, and 12.0.1.0 through 12.0.12.27 could allow a remote attacker to traverse directories on the system. An attacker could send a specially crafted URL request containing "dot dot" sequences

How urgent is CVE-2026-15435?

Priority 56/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Related CVEs

References

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