Spring Security versions 5.1.x prior to 5.1.2 contain an authorization bypass vulnerability during JWT issuer validation.

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• cpe vmware/spring framework< 5.1.2

How to fix CVE-2018-15801

• Upgrade

  CVE-2018-15801 lists a fix boundary at 5.1.2. Compare the installed build with that boundary before you change production.

• Version check

  Affected < 5.1.2

• Advisory

  Open the cve_org record and follow its fix.

• Official advisories

  • CVE.org · cve.org
  • Monitored products — high · nvd.nist.gov

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Technology hubs

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Dec 19, 2018 · Monitored products — high

   Detected

   Spring Security versions 5.1.x prior to 5.1.2 contain an authorization bypass vulnerability during JWT issuer validation. In order to be impacted, the same private key for an honest issuer and a malicious user must be used when signing JWTs. In that case, a malicious user could fashion signed JWTs with the malicious issuer URL that may be granted for the honest issuer.

2. Jun 17, 2026 · Monitored products — high

   Updated

   Spring Security versions 5.1.x prior to 5.1.2 contain an authorization bypass vulnerability during JWT issuer validation. In order to be impacted, the same private key for an honest issuer and a malicious user must be used when signing JWTs. In that case, a malicious user could fashion signed JWTs with the malicious issuer URL that may be granted for the honest issuer.

Sources

• CVE.orgVulnerability recordCVE-2018-15801

  Official CVE identifier

  cve.org
• Monitored products — highVendor advisoryCVE-2018-15801

  Spring Security versions 5.1.x prior to 5.1.2 contain an authorization bypass vulnerability during JWT issuer validation. In order to be impacted, the same private key for an honest issuer and a malicious user must be used when signing JWTs. In that case, a malicious user could fashion signed JWTs with the malicious issuer URL that may be granted for the honest issuer.

  nvd.nist.gov

References

• Vendor Advisory · pivotal.io

Freshness

Last verified in this catalog Nov 7, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

• CVE.orgNov 7, 2026
• Monitored products — highNov 7, 2026