CVE-2026-27679: Due to missing authorization checks in the SAP S/4HANA frontend OData Service (Manage Reference Structures), a

Routine

MEDIUM 6.5DOWNGRADE

CVE-2026-27679 is a medium-severity flaw (CVSS 6.5) affecting manage reference structures. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Due to missing authorization checks in the SAP S/4HANA frontend OData Service (Manage Reference Structures), an attacker could update and delete child entities via exposed OData services without proper authorization. This vulnerability has a high impact on integrity, while confidentiality and availability are not impacted.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-04-14
Last modified	2026-10-26

Publisher (CNA): SAP SE · Vendor: sap

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-14 00:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

sap manage reference structures DOWNGRADE

Affected: uis4h_109

Fixed in: no fixed release known

Safe to downgrade to: a release before uis4h_109

1. Check installed version

apt-cache policy manage-reference-structures || rpm -q manage-reference-structures || manage-reference-structures --version

2. No fixed release: DOWNGRADE to a release before uis4h_109 (Debian / Ubuntu)

apt-cache madison manage-reference-structures sudo apt install manage-reference-structures=<VERSION_BEFORE_uis4h_109> sudo apt-mark hold manage-reference-structures

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

dnf --showduplicates list manage-reference-structures sudo dnf downgrade manage-reference-structures-<VERSION_BEFORE_uis4h_109> sudo dnf versionlock add manage-reference-structures

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-2026-27679?

manage reference structures: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-27679 being exploited?

CVE-2026-27679 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-2026-27679 affect?

CVE-2026-27679 affects manage reference structures. Severity is medium (CVSS 6.5). Due to missing authorization checks in the SAP S/4HANA frontend OData Service (Manage Reference Structures), an attacker could update and delete child entities via exposed OData services without proper authorization. This vulnerability has

How urgent is CVE-2026-27679?

Priority 25/100. No elevated risk signals yet.

Software pages

SAP vulnerabilities

References

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