CVE-2026-47877: Spring Security Authorization Server Default Consent Page is vulnerable to Cross-Site Scripting (XSS)

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-27 · updated 2026-09-02
Weakness: CWE-79

Description

Spring Security Authorization Server's default consent page renders user-controlled values without HTML entity encoding. Spring Security 7.1.0 Spring Security 7.0.0 - 7.0.6

Affected products

Spring Security: from 7.0.0 before 7.0.6.1; from 7.1.0 before 7.1.0.1 — fixed in 7.0.6.1, 7.1.0.1
Spring Security: from 7.0.0 through 7.0.6; 7.1.0

How to fix

Upgrade to a fixed version: Spring Security 7.0.6.1, 7.1.0.1. Check the vendor advisory for mitigations.

References

https://spring.io/security/cve-2026-47877

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