CVE-2026-0977: IBM CICS Transaction Gateway for Multiplatforms 9.3 and 10.1 could allow a user to transfer or view files due

Routine

MEDIUM 5.1DOWNGRADE

CVE-2026-0977 is a medium-severity flaw (CVSS 5.1) affecting cics transaction gateway. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM CICS Transaction Gateway for Multiplatforms 9.3 and 10.1 could allow a user to transfer or view files due to improper access controls.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.1 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-284
Published	2026-03-16
Last modified	2026-06-17

Publisher (CNA): IBM Corporation · Vendor: ibm

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-16 14:18 UTCPublished CVE record published
2026-06-17 10:11 UTCUpdated Record last modified

ibm cics transaction gateway DOWNGRADE

Affected: 9.3 · 10.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.3

1. Check installed version

apt-cache policy cics-transaction-gateway || rpm -q cics-transaction-gateway || cics-transaction-gateway --version

2. No fixed release: DOWNGRADE to a release before 9.3 (Debian / Ubuntu)

apt-cache madison cics-transaction-gateway sudo apt install cics-transaction-gateway=<VERSION_BEFORE_9.3> sudo apt-mark hold cics-transaction-gateway

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cics-transaction-gateway sudo dnf downgrade cics-transaction-gateway-<VERSION_BEFORE_9.3> sudo dnf versionlock add cics-transaction-gateway

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.

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-2026-0977?

cics transaction gateway: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-0977 being exploited?

CVE-2026-0977 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-2026-0977 affect?

CVE-2026-0977 affects cics transaction gateway. Severity is medium (CVSS 5.1). IBM CICS Transaction Gateway for Multiplatforms 9.3 and 10.1 could allow a user to transfer or view files due to improper access controls.

How urgent is CVE-2026-0977?

Priority 21/100. No elevated risk signals yet.

Related CVEs

CVE-2023-50311 LOW 3.1 DOWNGRADE IBM CICS Transaction Gateway for Multiplatforms 9.2 and 9.3 could disclose sensitive path information to an at
CVE-2023-50310 MEDIUM 4.9 DOWNGRADE IBM CICS Transaction Gateway for Multiplatforms 9.2 and 9.3 transmits or stores authentication credentials, bu

References

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