Vulnerability-Lookup

GHSA-C62G-J346-39V5

Vulnerability from github – Published: 2026-05-08 18:31 – Updated: 2026-06-08 23:12

Summary

absinthe_plug Has a Cross-site Scripting vulnerability

Details

Improper Neutralization of Input During Web Page Generation (XSS) vulnerability in absinthe-graphql absinthe_plug allows reflected cross-site scripting via the GraphiQL interface.

'Elixir.Absinthe.Plug.GraphiQL':js_escape/1 in lib/absinthe/plug/graphiql.ex escapes single quotes and newlines in the query GET parameter before embedding it in an inline JavaScript string, but does not escape backslashes. An attacker can bypass the escaping by prefixing a quote with a backslash (e.g. \'), breaking out of the string context and executing arbitrary JavaScript in the victim's browser.

This issue affects absinthe_plug: from 1.2.0.

Severity

6.1 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

2.3 (Low)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Hex",
        "name": "absinthe_plug"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.2.0"
            },
            {
              "last_affected": "1.5.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42794"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-14T13:09:29Z",
    "nvd_published_at": "2026-05-08T16:16:12Z",
    "severity": "LOW"
  },
  "details": "Improper Neutralization of Input During Web Page Generation (XSS) vulnerability in absinthe-graphql absinthe_plug allows reflected cross-site scripting via the GraphiQL interface.\n\n\u0027Elixir.Absinthe.Plug.GraphiQL\u0027:js_escape/1 in lib/absinthe/plug/graphiql.ex escapes single quotes and newlines in the query GET parameter before embedding it in an inline JavaScript string, but does not escape backslashes. An attacker can bypass the escaping by prefixing a quote with a backslash (e.g. \\\u0027), breaking out of the string context and executing arbitrary JavaScript in the victim\u0027s browser.\n\nThis issue affects absinthe_plug: from 1.2.0.",
  "id": "GHSA-c62g-j346-39v5",
  "modified": "2026-06-08T23:12:53Z",
  "published": "2026-05-08T18:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42794"
    },
    {
      "type": "WEB",
      "url": "https://github.com/absinthe-graphql/absinthe_plug/issues/275"
    },
    {
      "type": "WEB",
      "url": "https://github.com/absinthe-graphql/absinthe_plug/commit/23a0d5658d32420086711adf4ce8f05febb09963"
    },
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-42794.html"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/absinthe-graphql/absinthe_plug"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-42794"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "absinthe_plug Has a Cross-site Scripting vulnerability"
}

CVE-2026-42794 (GCVE-0-2026-42794)

Vulnerability from cvelistv5 – Published: 2026-05-08 15:42 – Updated: 2026-05-16 10:21

Title

Reflected XSS via backslash bypass in GraphiQL js_escape in absinthe_plug

Summary

Improper Neutralization of Input During Web Page Generation (XSS) vulnerability in absinthe-graphql absinthe_plug allows reflected cross-site scripting via the GraphiQL interface. 'Elixir.Absinthe.Plug.GraphiQL':js_escape/1 in lib/absinthe/plug/graphiql.ex escapes single quotes and newlines in the query GET parameter before embedding it in an inline JavaScript string, but does not escape backslashes. An attacker can bypass the escaping by prefixing a quote with a backslash (e.g. \'), breaking out of the string context and executing arbitrary JavaScript in the victim's browser. This issue affects absinthe_plug: from 1.2.0 before 1.5.10.

Severity

2.3 (Low)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-08 16:07 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

EEF mitre root

References

4 references

URL	Tags
https://github.com/absinthe-graphql/absinthe_plug…	vendor-advisory
https://cna.erlef.org/cves/CVE-2026-42794.html	related
https://osv.dev/vulnerability/EEF-CVE-2026-42794	related
https://github.com/absinthe-graphql/absinthe_plug…	patch

Impacted products

2 products

Vendor	Product	Version
absinthe-graphql	absinthe_plug	Affected: 1.2.0 , < 1.5.10 (semver) cpe:2.3:a:absinthe-graphql:absinthe_plug::::::::
absinthe-graphql	absinthe_plug	Affected: 26241817cb4b9be4de3f5972c5fba3d36de3d713 , < 23a0d5658d32420086711adf4ce8f05febb09963 (git) cpe:2.3:a:absinthe-graphql:absinthe_plug::::::::

Credits

40826d Bryan A. Enders Leandro Moreno Ben Wilson

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42794",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-08T16:07:51.313563Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-08T16:08:26.818Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/absinthe-graphql/absinthe_plug/issues/275"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://repo.hex.pm",
          "cpes": [
            "cpe:2.3:a:absinthe-graphql:absinthe_plug:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.Absinthe.Plug.GraphiQL\u0027"
          ],
          "packageName": "absinthe_plug",
          "packageURL": "pkg:hex/absinthe_plug",
          "product": "absinthe_plug",
          "programFiles": [
            "lib/absinthe/plug/graphiql.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Absinthe.Plug.GraphiQL\u0027:js_escape/1"
            }
          ],
          "repo": "https://github.com/absinthe-graphql/absinthe_plug",
          "vendor": "absinthe-graphql",
          "versions": [
            {
              "lessThan": "1.5.10",
              "status": "affected",
              "version": "1.2.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:absinthe-graphql:absinthe_plug:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.Absinthe.Plug.GraphiQL\u0027"
          ],
          "packageName": "absinthe-graphql/absinthe_plug",
          "packageURL": "pkg:github/absinthe-graphql/absinthe_plug",
          "product": "absinthe_plug",
          "programFiles": [
            "lib/absinthe/plug/graphiql.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Absinthe.Plug.GraphiQL\u0027:js_escape/1"
            }
          ],
          "repo": "https://github.com/absinthe-graphql/absinthe_plug",
          "vendor": "absinthe-graphql",
          "versions": [
            {
              "lessThan": "23a0d5658d32420086711adf4ce8f05febb09963",
              "status": "affected",
              "version": "26241817cb4b9be4de3f5972c5fba3d36de3d713",
              "versionType": "git"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "The application must mount \u003ctt\u003eAbsinthe.Plug.GraphiQL\u003c/tt\u003e on a route that is reachable by untrusted users. The GraphiQL interface is a developer tool and is typically disabled or restricted in production deployments."
            }
          ],
          "value": "The application must mount Absinthe.Plug.GraphiQL on a route that is reachable by untrusted users. The GraphiQL interface is a developer tool and is typically disabled or restricted in production deployments."
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:absinthe-graphql:absinthe_plug:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "1.5.10",
                  "versionStartIncluding": "1.2.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ],
          "operator": "AND"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "40826d"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Bryan A. Enders"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Leandro Moreno"
        },
        {
          "lang": "en",
          "type": "remediation reviewer",
          "value": "Ben Wilson"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Improper Neutralization of Input During Web Page Generation (XSS) vulnerability in absinthe-graphql absinthe_plug allows reflected cross-site scripting via the GraphiQL interface.\u003cp\u003e\u003ctt\u003e\u0027Elixir.Absinthe.Plug.GraphiQL\u0027:js_escape/1\u003c/tt\u003e in \u003ctt\u003elib/absinthe/plug/graphiql.ex\u003c/tt\u003e escapes single quotes and newlines in the \u003ctt\u003equery\u003c/tt\u003e GET parameter before embedding it in an inline JavaScript string, but does not escape backslashes. An attacker can bypass the escaping by prefixing a quote with a backslash (e.g. \u003ctt\u003e\\\u0027\u003c/tt\u003e), breaking out of the string context and executing arbitrary JavaScript in the victim\u0027s browser.\u003c/p\u003e\u003cp\u003eThis issue affects absinthe_plug: from 1.2.0 before 1.5.10.\u003c/p\u003e"
            }
          ],
          "value": "Improper Neutralization of Input During Web Page Generation (XSS) vulnerability in absinthe-graphql absinthe_plug allows reflected cross-site scripting via the GraphiQL interface.\n\n\u0027Elixir.Absinthe.Plug.GraphiQL\u0027:js_escape/1 in lib/absinthe/plug/graphiql.ex escapes single quotes and newlines in the query GET parameter before embedding it in an inline JavaScript string, but does not escape backslashes. An attacker can bypass the escaping by prefixing a quote with a backslash (e.g. \\\u0027), breaking out of the string context and executing arbitrary JavaScript in the victim\u0027s browser.\n\nThis issue affects absinthe_plug: from 1.2.0 before 1.5.10."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-86",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-86 XSS Using HTTP Query Strings"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 2.3,
            "baseSeverity": "LOW",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-16T10:21:31.067Z",
        "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "shortName": "EEF"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/absinthe-graphql/absinthe_plug/issues/275"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://cna.erlef.org/cves/CVE-2026-42794.html"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://osv.dev/vulnerability/EEF-CVE-2026-42794"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/absinthe-graphql/absinthe_plug/commit/23a0d5658d32420086711adf4ce8f05febb09963"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Reflected XSS via backslash bypass in GraphiQL js_escape in absinthe_plug",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
    "assignerShortName": "EEF",
    "cveId": "CVE-2026-42794",
    "datePublished": "2026-05-08T15:42:40.706Z",
    "dateReserved": "2026-04-29T18:06:33.251Z",
    "dateUpdated": "2026-05-16T10:21:31.067Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.