CVE-2026-59316: Spring Authorization Server Default Consent Page is vulnerable to Cross-Site Scripting (XSS)

Severity: high (CVSS 8.2 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 2026-08-31
Weakness: CWE-79

Description

Spring Authorization Server's default consent page renders user-controlled values without HTML entity encoding. When using the DefaultConsentPage, an attacker can craft an OAuth2 authorization request containing a malicious value that is stored server-side and later rendered unencoded in the default consent page presented to the end user. Spring Authorization Server 1.5.0 - 1.5.8 Spring Authorization Server 1.4.0 - 1.4.11

Affected products

Spring Authorization Server: from 1.4.0 before 1.4.12; from 1.5.0 before 1.5.9 — fixed in 1.4.12, 1.5.9

How to fix

Upgrade to a fixed version: Spring Authorization Server 1.4.12, 1.5.9. Check the vendor advisory for mitigations.

References

https://spring.io/security/cve-2026-59316

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