CVE-2026-123540 (GCVE-0-2026-123540)

Vulnerability from cvelistv5 – Published: 2026-11-08 01:37 – Updated: 2026-11-08 01:37
VLAI
Title
OpenAM before 16.1.4 Incomplete Attribute Encoding in SAML 1.x Form POST
Summary
OpenAM before 16.1.4 contains an incomplete output encoding vulnerability that allows a SAML 1.x identity provider to alter attribute values by injecting unencoded content into the service provider auto-submitted form. Attackers controlling a trusted identity provider can craft assertion attribute names or values that reach the target application in modified form, undermining the integrity of received attributes.
Severity
2 (Low)
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
2 (Low)
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N
CWE
  • CWE-116 - Improper Encoding or Escaping of Output
Assigner
VulnCheck CNA
References
Impacted products
Vendor Product Version
OpenIdentityPlatform OpenAM Affected: 0 , < 16.1.4 (semver)
Unaffected: 16.1.4 (semver)
    cpe:2.3:a:openidentityplatform:openam:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-10-22 00:00
Credits
qurb4n01 vharseko maximthomas tsujiguchitky
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:maven/org.openidentityplatform.openam/openam-federation-library",
          "product": "OpenAM",
          "vendor": "OpenIdentityPlatform",
          "versions": [
            {
              "lessThan": "16.1.4",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "16.1.4",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
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                  "versionEndExcluding": "16.1.4",
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                }
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              "negate": false,
              "operator": "OR"
            }
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      "credits": [
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          "type": "reporter",
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        {
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          "type": "remediation developer",
          "value": "vharseko"
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        {
          "lang": "en",
          "type": "remediation reviewer",
          "value": "maximthomas"
        },
        {
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          "value": "tsujiguchitky"
        }
      ],
      "datePublic": "2026-10-22T00:00:00.000Z",
      "descriptions": [
        {
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        }
      ],
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            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 2,
            "baseSeverity": "LOW",
            "privilegesRequired": "HIGH",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
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            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW"
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            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS"
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      "problemTypes": [
        {
          "descriptions": [
            {
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              "description": "Improper Encoding or Escaping of Output",
              "lang": "en",
              "type": "CWE"
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-08T01:37:46.615Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Security Advisory (GHSA-pw99-8h4m-p3gm)",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-pw99-8h4m-p3gm"
        },
        {
          "name": "VulnCheck Advisory: OpenAM before 16.1.4 Incomplete Attribute Encoding in SAML 1.x Form POST",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/openam-before-16.1.4-incomplete-attribute-encoding-in-saml-1-x-form-post"
        }
      ],
      "title": "OpenAM before 16.1.4 Incomplete Attribute Encoding in SAML 1.x Form POST",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-123540",
    "datePublished": "2026-11-08T01:37:46.615Z",
    "dateReserved": "2026-11-06T00:48:46.279Z",
    "dateUpdated": "2026-11-08T01:37:46.615Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



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