CVE-2026-47877Network attack vectorHinoki check available

Cross-site scripting via unencoded OAuth request values

Published Aug 27, 2026 · Updated Aug 27, 2026

Cross-site scripting in Spring Security 7.0.0 through 7.0.6 and 7.1.0 allows remote attackers to execute script via crafted OAuth2 requests. The DefaultConsentPage retrieves a malicious authorization-request value from server-side storage and renders it without HTML entity encoding. The application must use the default consent page and an end user must open the resulting consent prompt; custom consent pages are unaffected.

CVSS severity8.2
High
EPSS probability0.16%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Cross-site scripting in Spring Security 7.0.0 through 7.0.6 and 7.1.0 allows remote attackers to execute script via crafted OAuth2 requests. The DefaultConsentPage retrieves a malicious authorization-request value from server-side storage and renders it without HTML entity encoding. The application must use the default consent page and an end user must open the resulting consent prompt; custom consent pages are unaffected.

The record

CVE
CVE-2026-47877
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
Spring
Product
Spring Security
Classifications
CWE-79, T1189
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

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Is a vulnerable build present?

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

  1. Affected versionversion=7.0.0 <=7.0.6
  2. Affected versionversion=7.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Spring · Spring Securityversion=7.0.0 <=7.0.6; version=7.1.0

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.

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No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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