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CVE-2018-15801

Status: ModifiedHigh (7.4)—

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.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

Source: official MITRE CTID mapping (CVE → ATT&CK).

🛡️ ATT&CK mitigations that cover these techniques

Application Developer GuidanceRestrict Web-Based ContentAccount Use PoliciesEncrypt Sensitive InformationAudit

Affected technologies (1)

Vmware — Spring Framework

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2018-15801",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 4.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
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    "cvssMetricV30": [
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        "type": "Secondary",
        "source": "security_alert@emc.com",
        "cvssData": {
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          "baseScore": 3.3,
          "attackVector": "NETWORK",
          "baseSeverity": "LOW",
          "vectorString": "CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
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          "privilegesRequired": "HIGH",
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    "cvssMetricV31": [
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        "type": "Primary",
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  "affected": [
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      "affectedData": [
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          "vendor": "Spring by Pivotal",
          "product": "Spring Security",
          "versions": [
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              "version": "5.1.x",
              "lessThan": "5.1.2",
              "versionType": "custom"
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  ],
  "published": "2018-12-19T22:29:00.593",
  "references": [
    {
      "url": "https://pivotal.io/security/cve-2018-15801",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security_alert@emc.com"
    },
    {
      "url": "https://pivotal.io/security/cve-2018-15801",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-345"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "Spring Security, en versiones 5.1.x anteriores a la 5.1.2 contiene una vulnerabilidad de omisión de autenticación durante la validación del emisor JWT. Para que sufra un impacto, debe emplearse la misma clave privada para un emisor honesto y un usuario malicioso al firmar JWT. En ese caso, un usuario malicioso podría fabricar JWT firmados con la URL del emisor"
    }
  ],
  "lastModified": "2026-06-17T01:43:07.673",
  "configurations": [
    {
      "nodes": [
        {
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          "cpeMatch": [
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}