CVE-2026-34257: Due to an Open Redirect vulnerability in SAP NetWeaver Application Server ABAP, an unauthenticated attacker co

Routine

MEDIUM 6.1DOWNGRADE

CVE-2026-34257 is a medium-severity flaw (CVSS 6.1) affecting netweaver application server abap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Due to an Open Redirect vulnerability in SAP NetWeaver Application Server ABAP, an unauthenticated attacker could craft malicious URL that, if accessed by a victim, they could be redirected to the page controlled by the attacker. This causes low impact on confidentiality and integrity of the application with no impact on availability.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-601
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 01:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

sap netweaver application server abap DOWNGRADE

Affected: 700 · 701 · 702 · 731 · 740 · 750 · 752 · 753

Fixed in: no fixed release known

Safe to downgrade to: a release before 700

1. Check installed version

apt-cache policy netweaver-application-server-abap || rpm -q netweaver-application-server-abap || netweaver-application-server-abap --version

2. No fixed release: DOWNGRADE to a release before 700 (Debian / Ubuntu)

apt-cache madison netweaver-application-server-abap sudo apt install netweaver-application-server-abap=<VERSION_BEFORE_700> sudo apt-mark hold netweaver-application-server-abap

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

dnf --showduplicates list netweaver-application-server-abap sudo dnf downgrade netweaver-application-server-abap-<VERSION_BEFORE_700> sudo dnf versionlock add netweaver-application-server-abap

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-2026-34257?

netweaver application server abap: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-34257 being exploited?

CVE-2026-34257 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-2026-34257 affect?

CVE-2026-34257 affects netweaver application server abap. Severity is medium (CVSS 6.1). Due to an Open Redirect vulnerability in SAP NetWeaver Application Server ABAP, an unauthenticated attacker could craft malicious URL that, if accessed by a victim, they could be redirected to the page controlled by the attacker. This cause

How urgent is CVE-2026-34257?

Priority 22/100. No elevated risk signals yet.

Software pages

SAP vulnerabilities

Related CVEs

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CVE-2026-27680 LOW 3.1 DOWNGRADE Due to improper input handling under certain conditions, SAP NetWeaver Application Server ABAP allows an attac

References

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