CVE-2026-47889

Spring Framework sameSite Attribute Dropped in JettyCoreServerHttpResponse

HIGH

7.5

CVSS Score

Published: August 27, 2026 at 05:21 AM UTC

Updated: September 10, 2026 at 04:18 PM UTC

2 products affected across 2 vendorsSpring FrameworkSpring Framework

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Severity

HIGH7.5

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

Description

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Spring Framework · VMware

95%

6.2.0 ≤ v < 6.2.207.0.0 ≤ v < 7.0.8.1

Affected range stops below 6.2.20, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.0.8.1, so it looks safe — our inference, not a vendor statement

Spring Framework · Spring

60%

6.2.0 ≤ v ≤ 6.2.197.0.0 ≤ v ≤ 7.0.86.2.0 7.0.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://spring.io/security/cve-2026-47889

References (1)

Vendor Advisory

Source: [email protected]

https://spring.io/security/cve-2026-47889

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-1275

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