CVE-2026-59316Network attack vector

Stored XSS via unencoded consent values

Published Aug 27, 2026 · Updated Aug 27, 2026

Stored XSS in Spring Authorization Server 1.4.0 through 1.4.11 and 1.5.0 through 1.5.8 allows remote attackers to run script via OAuth2 requests. DefaultConsentPage stores user-controlled request values and later renders them without HTML entity encoding in the consent page shown to an end user. Exploitation requires an affected application to use the default consent page and an end user to view it; applications with a custom consent page are unaffected.

CVSS severity8.2
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in Spring Authorization Server 1.4.0 through 1.4.11 and 1.5.0 through 1.5.8 allows remote attackers to run script via OAuth2 requests. DefaultConsentPage stores user-controlled request values and later renders them without HTML entity encoding in the consent page shown to an end user. Exploitation requires an affected application to use the default consent page and an end user to view it; applications with a custom consent page are unaffected.

The record

CVE
CVE-2026-59316
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
Spring
Product
Spring Authorization Server
Classifications
T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.4.0 <=1.4.11
  2. Affected versionversion=1.5.0 <=1.5.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Spring · Spring Authorization Serverversion=1.4.0 <=1.4.11; version=1.5.0 <=1.5.8

Published CVSS scores

8.2SpringCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo