Vulnerability-Lookup

GHSA-HXP4-RF8G-9MWQ

Vulnerability from github – Published: 2026-04-23 18:33 – Updated: 2026-04-23 18:33

Details

A critical XSS vulnerability affected hackage-server and hackage.haskell.org. HTML and JavaScript files provided in source packages or via the documentation upload facility were served as-is on the main hackage.haskell.org domain. As a consequence, when a user with latent HTTP credentials browses to the package pages or documentation uploaded by a malicious package maintainer, their session can be hijacked to upload packages or documentation, amend maintainers or other package metadata, or perform any other action the user is authorised to do.

Severity

9.9 (Critical)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-40470"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-23T16:16:25Z",
    "severity": "CRITICAL"
  },
  "details": "A critical XSS vulnerability affected hackage-server and\nhackage.haskell.org.  HTML and JavaScript files provided in source\npackages or via the documentation upload facility were served\nas-is on the main hackage.haskell.org domain.  As a consequence,\nwhen a user with latent HTTP credentials browses to the package\npages or documentation uploaded by a malicious package maintainer,\ntheir session can be hijacked to upload packages or\ndocumentation, amend maintainers or other package metadata, or\nperform any other action the user is authorised to do.",
  "id": "GHSA-hxp4-rf8g-9mwq",
  "modified": "2026-04-23T18:33:03Z",
  "published": "2026-04-23T18:33:03Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40470"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/HSEC-2024-0004"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-40470 (GCVE-0-2026-40470)

Vulnerability from cvelistv5 – Published: 2026-04-23 14:53 – Updated: 2026-04-23 16:22

Title

Hackage package and doc upload stored XSS vulnerability

Summary

Severity

9.9 (Critical)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-23 16:19 UTC

CWE

CWE-79 - Improper neutralization of input during web page generation ('cross-site scripting')

Assigner

redhat-cnalr

References

1 reference

URL	Tags
https://osv.dev/vulnerability/HSEC-2024-0004

Impacted products

1 product

Vendor	Product	Version
		Affected: 0.1 , < 0.6 (semver)

Date Public

2026-01-16 14:18

Show details on NVD website

JSON

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  "containers": {
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        "metrics": [
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                "id": "CVE-2026-40470",
                "options": [
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                  },
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                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-23T16:19:40.142224Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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    ],
    "cna": {
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          "defaultStatus": "unaffected",
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      "metrics": [
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
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      "references": [
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          "url": "https://osv.dev/vulnerability/HSEC-2024-0004"
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    "dateReserved": "2026-04-13T15:23:17.067Z",
    "dateUpdated": "2026-04-23T16:22:27.341Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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}

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.