Vulnerability-Lookup

GHSA-W7Q4-4CCP-896R

Vulnerability from github – Published: 2026-10-14 15:32 – Updated: 2026-10-14 15:32

Details

Gitea's web attachment handler skips its cross-repository ownership check for attachments created before 16 January 2026 and checks permissions against the repository named in the request URL instead. An unauthenticated attacker who knows a private attachment's UUID can request it through a public repository's attachment path and retrieve its contents. This can expose issue and pull request attachments or release assets; the random attachment UUID must already be known to the attacker.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-78433"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-284"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-14T15:17:25Z",
    "severity": null
  },
  "details": "Gitea\u0027s web attachment handler skips its cross-repository ownership check for attachments created before 16 January 2026 and checks permissions against the repository named in the request URL instead. An unauthenticated attacker who knows a private attachment\u0027s UUID can request it through a public repository\u0027s attachment path and retrieve its contents. This can expose issue and pull request attachments or release assets; the random attachment UUID must already be known to the attacker.",
  "id": "GHSA-w7q4-4ccp-896r",
  "modified": "2026-10-14T15:32:30Z",
  "published": "2026-10-14T15:32:30Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/go-gitea/gitea/security/advisories/GHSA-frpv-2xgv-wxpq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-78433"
    },
    {
      "type": "WEB",
      "url": "https://github.com/go-gitea/gitea/pull/39048"
    },
    {
      "type": "WEB",
      "url": "https://github.com/go-gitea/gitea/pull/39077"
    },
    {
      "type": "WEB",
      "url": "https://blog.gitea.com/release-of-1.27.3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/go-gitea/gitea/releases/tag/v1.27.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-78433 (GCVE-0-2026-78433)

Vulnerability from cvelistv5 – Published: 2026-10-14 14:38 – Updated: 2026-10-14 14:38

Title

Gitea private attachment disclosure through repository mismatch

Summary

Severity

No CVSS data available.

CWE

CWE-284 - Improper Access Control
CWE-639 - Authorization Bypass Through User-Controlled Key
CWE-863 - Incorrect Authorization
CWE-1220 - Insufficient Granularity of Access Control

Assigner

Gitea CNA under the mitre root

CNA scorecard C 61/100 over 153 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/go-gitea/gitea/security/adviso…	vendor-advisory
https://blog.gitea.com/release-of-1.27.3/	release-notes
https://github.com/go-gitea/gitea/pull/39048	patch
https://github.com/go-gitea/gitea/pull/39077	patch
https://github.com/go-gitea/gitea/releases/tag/v1.27.3	release-notes

Impacted products

1 product

Vendor	Product	Version
Gitea	Gitea	Affected: 1.26.0 , ≤ 1.27.2 (semver)

Credits

https://github.com/iabdullah215 https://github.com/bircni https://github.com/silverwind

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageName": "gitea.dev",
          "product": "Gitea",
          "vendor": "Gitea",
          "versions": [
            {
              "lessThanOrEqual": "1.27.2",
              "status": "affected",
              "version": "1.26.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "https://github.com/iabdullah215"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "https://github.com/bircni"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "https://github.com/silverwind"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Gitea\u0027s web attachment handler skips its cross-repository ownership check for attachments created before 16 January 2026 and checks permissions against the repository named in the request URL instead. An unauthenticated attacker who knows a private attachment\u0027s UUID can request it through a public repository\u0027s attachment path and retrieve its contents. This can expose issue and pull request attachments or release assets; the random attachment UUID must already be known to the attacker."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-284",
              "description": "CWE-284: Improper Access Control",
              "lang": "en",
              "type": "CWE"
            },
            {
              "cweId": "CWE-639",
              "description": "CWE-639: Authorization Bypass Through User-Controlled Key",
              "lang": "en",
              "type": "CWE"
            },
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            },
            {
              "cweId": "CWE-1220",
              "description": "CWE-1220: Insufficient Granularity of Access Control",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-14T14:38:17.247Z",
        "orgId": "88ee5874-cf24-4952-aea0-31affedb7ff2",
        "shortName": "Gitea"
      },
      "references": [
        {
          "name": "GitHub Security Advisory GHSA-frpv-2xgv-wxpq",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/go-gitea/gitea/security/advisories/GHSA-frpv-2xgv-wxpq"
        },
        {
          "name": "Gitea 1.27.3 release announcement",
          "tags": [
            "release-notes"
          ],
          "url": "https://blog.gitea.com/release-of-1.27.3/"
        },
        {
          "name": "Fix: go-gitea/gitea pull request #39048",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/go-gitea/gitea/pull/39048"
        },
        {
          "name": "Fix: go-gitea/gitea pull request #39077",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/go-gitea/gitea/pull/39077"
        },
        {
          "name": "go-gitea/gitea v1.27.3 release",
          "tags": [
            "release-notes"
          ],
          "url": "https://github.com/go-gitea/gitea/releases/tag/v1.27.3"
        }
      ],
      "title": "Gitea private attachment disclosure through repository mismatch"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "88ee5874-cf24-4952-aea0-31affedb7ff2",
    "assignerShortName": "Gitea",
    "cveId": "CVE-2026-78433",
    "datePublished": "2026-10-14T14:38:17.247Z",
    "dateReserved": "2026-08-24T20:45:09.297Z",
    "dateUpdated": "2026-10-14T14:38:17.247Z",
    "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.

Vulnerability timeline

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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.

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