Vulnerability-Lookup

CVE-2026-86178 (GCVE-0-2026-86178)

Vulnerability from cvelistv5 – Published: 2026-09-05 11:01 – Updated: 2026-09-08 17:21

Title

Pixelfed through 0.12.9 Unauthorized Story Access via API

Summary

Pixelfed through 0.12.9 fails to validate follower status in StoryComposeController react and comment endpoints, allowing authenticated users to access follower-only stories. Attackers can enumerate sequential story IDs and submit reactions or comments to retrieve story media URLs and author information without following the account.

Severity

5.4 (Medium)


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

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-08 17:20 UTC

CWE

CWE-862 - Missing Authorization

Assigner

VulnCheck mitre root

References

6 references

URL	Tags
https://github.com/geo-chen/oss/blob/main/Pixelfed.md	third-party-advisoryexploit
https://github.com/pixelfed/pixelfed/blob/v0.12.9…	technical-description
https://github.com/pixelfed/pixelfed/blob/v0.12.9…	technical-description
https://github.com/pixelfed/pixelfed/blob/v0.12.9…	technical-description
https://github.com/pixelfed/pixelfed	product
https://www.vulncheck.com/advisories/pixelfed-thr…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
pixelfed	pixelfed	Affected: 0 , ≤ 0.12.9 (semver) cpe:2.3:a:pixelfed:pixelfed::::::::

Date Public

2026-09-05 00:00

Credits

George Chen

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-86178

Vulnerability from fkie_nvd - Published: 2026-09-05 11:16 - Updated: 2026-09-08 18:21

Severity

5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/geo-chen/oss/blob/main/Pixelfed.md
	disclosure@vulncheck.com	https://github.com/pixelfed/pixelfed
	disclosure@vulncheck.com	https://github.com/pixelfed/pixelfed/blob/v0.12.9/app/Http/Controllers/StoryComposeController.php#L487-L501
	disclosure@vulncheck.com	https://github.com/pixelfed/pixelfed/blob/v0.12.9/app/Http/Controllers/StoryComposeController.php#L566-L580
	disclosure@vulncheck.com	https://github.com/pixelfed/pixelfed/blob/v0.12.9/routes/web-api.php#L154-L155
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/pixelfed-through-0.12.9-unauthorized-story-access-via-api

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/pixelfed/pixelfed/blob/v0.12.9/app/Http/Controllers/StoryComposeController.php#L487-L501"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/pixelfed/pixelfed/blob/v0.12.9/app/Http/Controllers/StoryComposeController.php#L566-L580"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/pixelfed/pixelfed/blob/v0.12.9/routes/web-api.php#L154-L155"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://www.vulncheck.com/advisories/pixelfed-through-0.12.9-unauthorized-story-access-via-api"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-CXPC-P44G-HXJ7

Vulnerability from github – Published: 2026-09-05 12:31 – Updated: 2026-09-05 12:31

Details

Severity

5.4 (Medium)


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

5.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-86178"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-05T11:16:46Z",
    "severity": "MODERATE"
  },
  "details": "Pixelfed through 0.12.9 fails to validate follower status in StoryComposeController react and comment endpoints, allowing authenticated users to access follower-only stories. Attackers can enumerate sequential story IDs and submit reactions or comments to retrieve story media URLs and author information without following the account.",
  "id": "GHSA-cxpc-p44g-hxj7",
  "modified": "2026-09-05T12:31:28Z",
  "published": "2026-09-05T12:31:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86178"
    },
    {
      "type": "WEB",
      "url": "https://github.com/geo-chen/oss/blob/main/Pixelfed.md"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pixelfed/pixelfed"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pixelfed/pixelfed/blob/v0.12.9/app/Http/Controllers/StoryComposeController.php#L487-L501"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pixelfed/pixelfed/blob/v0.12.9/app/Http/Controllers/StoryComposeController.php#L566-L580"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pixelfed/pixelfed/blob/v0.12.9/routes/web-api.php#L154-L155"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/pixelfed-through-0.12.9-unauthorized-story-access-via-api"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

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.

Action not permitted

CVE-2026-86178 (GCVE-0-2026-86178)

FKIE_CVE-2026-86178

GHSA-CXPC-P44G-HXJ7

Tags

Sightings

Nomenclature