CVE-2026-55075 (GCVE-0-2026-55075)

Vulnerability from cvelistv5 – Published: 2026-07-07 21:33 – Updated: 2026-07-08 13:03
VLAI
Title
Coder vulnerable to OIDC account takeover via email-based user matching and email_verified bypass
Summary
Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, two flaws in Coder's OIDC login chained into account takeover. Email-based user matching fell back to linking by email without checking for an existing link to a different IdP subject and the `email_verified` claim was only enforced when present as a boolean `false` so an absent or non-boolean claim was treated as verified. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 restricts the email fallback to first-time and legacy linking and defaults `email_verified` to false when the claim is absent or of an unexpected type. As a workaround, configure the OIDC provider to disallow self-registration or to require email verification before issuing tokens.
Severity
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-287 - Improper Authentication
  • CWE-289 - Authentication Bypass by Alternate Name
Assigner
References
Impacted products
Vendor Product Version
coder coder Affected: >= 2.34.0, < 2.34.2
Affected: >= 2.33.0, < 2.33.8
Affected: >= 2.30.0, < 2.32.7
Affected: < 2.29.17
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-55075",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-08T13:02:51.874018Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-08T13:03:16.212Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "coder",
          "vendor": "coder",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.34.0, \u003c 2.34.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.33.0, \u003c 2.33.8"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.30.0, \u003c 2.32.7"
            },
            {
              "status": "affected",
              "version": "\u003c 2.29.17"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, two flaws in Coder\u0027s OIDC login chained into account takeover. Email-based user matching fell back to linking by email without checking for an existing link to a different IdP subject and the `email_verified` claim was only enforced when present as a boolean `false` so an absent or non-boolean claim was treated as verified. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 restricts the email fallback to first-time and legacy linking and defaults `email_verified` to false when the claim is absent or of an unexpected type. As a workaround, configure the OIDC provider to disallow self-registration or to require email verification before issuing tokens."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-287",
              "description": "CWE-287: Improper Authentication",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-289",
              "description": "CWE-289: Authentication Bypass by Alternate Name",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-07T21:33:38.189Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/coder/coder/security/advisories/GHSA-9r87-mvcw-x35f",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/coder/coder/security/advisories/GHSA-9r87-mvcw-x35f"
        },
        {
          "name": "https://github.com/coder/coder/pull/25712",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coder/coder/pull/25712"
        },
        {
          "name": "https://github.com/coder/coder/pull/25713",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coder/coder/pull/25713"
        },
        {
          "name": "https://github.com/coder/coder/releases/tag/v2.29.17",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coder/coder/releases/tag/v2.29.17"
        },
        {
          "name": "https://github.com/coder/coder/releases/tag/v2.32.7",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coder/coder/releases/tag/v2.32.7"
        },
        {
          "name": "https://github.com/coder/coder/releases/tag/v2.33.8",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coder/coder/releases/tag/v2.33.8"
        },
        {
          "name": "https://github.com/coder/coder/releases/tag/v2.34.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coder/coder/releases/tag/v2.34.2"
        }
      ],
      "source": {
        "advisory": "GHSA-9r87-mvcw-x35f",
        "discovery": "UNKNOWN"
      },
      "title": "Coder vulnerable to OIDC account takeover via email-based user matching and email_verified bypass"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-55075",
    "datePublished": "2026-07-07T21:33:38.189Z",
    "dateReserved": "2026-06-16T14:33:35.710Z",
    "dateUpdated": "2026-07-08T13:03:16.212Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-55075",
      "date": "2026-07-08",
      "epss": "0.00482",
      "percentile": "0.38123"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-55075\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-07-07T22:16:53.650\",\"lastModified\":\"2026-07-08T19:46:56.620\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, two flaws in Coder\u0027s OIDC login chained into account takeover. Email-based user matching fell back to linking by email without checking for an existing link to a different IdP subject and the `email_verified` claim was only enforced when present as a boolean `false` so an absent or non-boolean claim was treated as verified. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 restricts the email fallback to first-time and legacy linking and defaults `email_verified` to false when the claim is absent or of an unexpected type. As a workaround, configure the OIDC provider to disallow self-registration or to require email verification before issuing tokens.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"coder\",\"product\":\"coder\",\"versions\":[{\"version\":\"\u003e= 2.34.0, \u003c 2.34.2\",\"status\":\"affected\"},{\"version\":\"\u003e= 2.33.0, \u003c 2.33.8\",\"status\":\"affected\"},{\"version\":\"\u003e= 2.30.0, \u003c 2.32.7\",\"status\":\"affected\"},{\"version\":\"\u003c 2.29.17\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N\",\"baseScore\":7.4,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.2,\"impactScore\":5.2}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-07-08T13:02:51.874018Z\",\"id\":\"CVE-2026-55075\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-287\"},{\"lang\":\"en\",\"value\":\"CWE-289\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*\",\"versionEndExcluding\":\"2.29.17\",\"matchCriteriaId\":\"F97FAF48-192E-4814-82A5-085C44F1D261\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*\",\"versionStartIncluding\":\"2.30.0\",\"versionEndExcluding\":\"2.32.7\",\"matchCriteriaId\":\"7ABD4A9B-6AE8-47D8-A1B7-91E42EE0481B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*\",\"versionStartIncluding\":\"2.33.0\",\"versionEndExcluding\":\"2.33.8\",\"matchCriteriaId\":\"F759EEF3-6EAE-475B-85F8-38E7D7B47438\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*\",\"versionStartIncluding\":\"2.34.0\",\"versionEndExcluding\":\"2.34.2\",\"matchCriteriaId\":\"397A02BF-6CF6-40B1-B792-D7CB9D229050\"}]}]}],\"references\":[{\"url\":\"https://github.com/coder/coder/pull/25712\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Issue Tracking\",\"Patch\"]},{\"url\":\"https://github.com/coder/coder/pull/25713\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Issue Tracking\",\"Patch\"]},{\"url\":\"https://github.com/coder/coder/releases/tag/v2.29.17\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Release Notes\"]},{\"url\":\"https://github.com/coder/coder/releases/tag/v2.32.7\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Release Notes\"]},{\"url\":\"https://github.com/coder/coder/releases/tag/v2.33.8\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Release Notes\"]},{\"url\":\"https://github.com/coder/coder/releases/tag/v2.34.2\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Release Notes\"]},{\"url\":\"https://github.com/coder/coder/security/advisories/GHSA-9r87-mvcw-x35f\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Patch\",\"Vendor Advisory\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-55075\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-07-08T13:02:51.874018Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-07-08T13:02:55.646Z\"}}], \"cna\": {\"title\": \"Coder vulnerable to OIDC account takeover via email-based user matching and email_verified bypass\", \"source\": {\"advisory\": \"GHSA-9r87-mvcw-x35f\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.4, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"coder\", \"product\": \"coder\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003e= 2.34.0, \u003c 2.34.2\"}, {\"status\": \"affected\", \"version\": \"\u003e= 2.33.0, \u003c 2.33.8\"}, {\"status\": \"affected\", \"version\": \"\u003e= 2.30.0, \u003c 2.32.7\"}, {\"status\": \"affected\", \"version\": \"\u003c 2.29.17\"}]}], \"references\": [{\"url\": \"https://github.com/coder/coder/security/advisories/GHSA-9r87-mvcw-x35f\", \"name\": \"https://github.com/coder/coder/security/advisories/GHSA-9r87-mvcw-x35f\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/coder/coder/pull/25712\", \"name\": \"https://github.com/coder/coder/pull/25712\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/coder/coder/pull/25713\", \"name\": \"https://github.com/coder/coder/pull/25713\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/coder/coder/releases/tag/v2.29.17\", \"name\": \"https://github.com/coder/coder/releases/tag/v2.29.17\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/coder/coder/releases/tag/v2.32.7\", \"name\": \"https://github.com/coder/coder/releases/tag/v2.32.7\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/coder/coder/releases/tag/v2.33.8\", \"name\": \"https://github.com/coder/coder/releases/tag/v2.33.8\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/coder/coder/releases/tag/v2.34.2\", \"name\": \"https://github.com/coder/coder/releases/tag/v2.34.2\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, two flaws in Coder\u0027s OIDC login chained into account takeover. Email-based user matching fell back to linking by email without checking for an existing link to a different IdP subject and the `email_verified` claim was only enforced when present as a boolean `false` so an absent or non-boolean claim was treated as verified. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 restricts the email fallback to first-time and legacy linking and defaults `email_verified` to false when the claim is absent or of an unexpected type. As a workaround, configure the OIDC provider to disallow self-registration or to require email verification before issuing tokens.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-287\", \"description\": \"CWE-287: Improper Authentication\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-289\", \"description\": \"CWE-289: Authentication Bypass by Alternate Name\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-07-07T21:33:38.189Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-55075\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-08T13:03:16.212Z\", \"dateReserved\": \"2026-06-16T14:33:35.710Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-07-07T21:33:38.189Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.