CVE-2026-47889: A WebFlux application running on the Jetty 12 Core reactive adapter serializes response cookies without the sa

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HIGH 7.5REMOTEUPGRADE

CVE-2026-47889 is a high-severity flaw (CVSS 7.5) affecting spring framework. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A WebFlux application running on the Jetty 12 Core reactive adapter serializes response cookies without the sameSite attribute. Spring Framework 7.0.0 - 7.0.8 Spring Framework 6.2.0 - 6.2.19

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-1275
Published	2026-08-27
Last modified	2026-09-10

Publisher (CNA): VMware · Vendor: vmware

Last updated 2026-09-10 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-27 06:17 UTCPublished CVE record published
2026-09-10 14:48 UTCUpdated Record last modified

vmware spring framework UPGRADE

Affected: >= 6.2.0 and < 6.2.20 · >= 7.0.0 and < 7.0.8.1

Fixed in: 6.2.20, 7.0.8.1

Safe to downgrade to: a release before 6.2.0

1. Check installed version

apt-cache policy spring-framework || rpm -q spring-framework || spring-framework --version

2. UPGRADE to 6.2.20 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade spring-framework

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade spring-framework

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 6.2.0 (Debian / Ubuntu)

apt-cache madison spring-framework sudo apt install spring-framework=<VERSION_BEFORE_6.2.0> sudo apt-mark hold spring-framework

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list spring-framework sudo dnf downgrade spring-framework-<VERSION_BEFORE_6.2.0> sudo dnf versionlock add spring-framework

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.

Advisories and coverage

Official advisories

Spring Security Advisories: cve-2026-47889 - MEDIUM - Spring Framework sameSite Attribute Dropped in JettyCoreServerHttpResponse 2026-08-20

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-2026-47889?

spring framework: upgrade to 6.2.20, 7.0.8.1. Exact commands for each OS are on this page.

Is CVE-2026-47889 being exploited?

CVE-2026-47889 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-2026-47889 affect?

CVE-2026-47889 affects spring framework. Severity is high (CVSS 7.5). A WebFlux application running on the Jetty 12 Core reactive adapter serializes response cookies without the sameSite attribute. Spring Framework 7.0.0 - 7.0.8 Spring Framework 6.2.0 - 6.2.19

How urgent is CVE-2026-47889?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

Software pages

Spring Framework vulnerabilities · VMware vulnerabilities

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References

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