Security readout for executives and security teams
Plain-English summary
This is a narrow Spring Security issue where JWT issuer validation could authorize the wrong issuer. It matters mainly if an organization used Spring Security 5.1.x before 5.1.2 and reused the same private JWT signing key across trusted and untrusted issuers.
Executive priority
Treat this as a targeted hygiene item, not an emergency. Prioritize it for systems that rely on JWT-based authorization and have legacy Spring Security 5.1.x dependencies or unclear signing-key ownership.
Technical view
Spring Security 5.1.x prior to 5.1.2 could grant authorization for an honest issuer when a malicious issuer signed JWTs with the same private key. The CVSS 3.0 score is 3.3, with high attack complexity and high privileges required.
Likely exposure
Exposure is likely limited to applications using Spring Security 5.1.x before 5.1.2 with JWT issuer validation and private key reuse across issuer boundaries. Systems not using that version line, JWT validation, or shared signing keys are unlikely to be affected.
Exploitation context
The source bundle does not identify active exploitation, and CISA KEV status is false. Practical abuse depends on an unusual key-management condition: the same private key being used by both an honest issuer and a malicious user-controlled issuer.
Researcher notes
The vulnerability hinges on issuer confusion under shared signing keys. CVSS vector is AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N. Evidence is limited to the CVE record and vendor reference; no exploit activity or broader affected product set is provided.
Mitigation direction
- Upgrade Spring Security 5.1.x deployments to 5.1.2 or later.
- Review vendor advisory guidance before changing production authentication behavior.
- Ensure JWT signing keys are unique per issuer and trust boundary.
- Rotate any shared issuer signing keys found during review.
Validation and detection
- Inventory applications using Spring Security 5.1.x.
- Confirm whether affected applications validate JWT issuers.
- Check dependency manifests for versions earlier than 5.1.2.
- Audit JWT key management for shared private keys across issuers.
- Review authentication logs for unexpected issuer values where available.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
Privilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-15801 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Low
- CVSS
- 3.3 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N0.72.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
3.3LowVector: CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://pivotal.io/security/cve-2018-15801CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.