Vulnerability-Lookup

CVE-2026-90679 (GCVE-0-2026-90679)

Vulnerability from cvelistv5 – Published: 2026-09-13 03:55 – Updated: 2026-09-15 17:17 X_Open Source

Summary

Forgejo 13.0.0 through 16.0.4, when "[federation] ENABLED = true" is set, has a spoofing issue that affects identity integrity but does not allow account takeover or content modification. It does not verify that the HTTP Signature on an incoming ActivityPub activity was produced by the key belonging to the actor named in the activity body. The signature verification in routers/api/v1/activitypub/reqsignature.go validates the request signature, but the inbox activity handlers subsequently read the acting identity from the attacker-controlled JSON body without binding it to the verified signing key. Additionally, the signed Digest header is not recomputed against the received request body. A remote attacker who hosts a single valid ActivityPub actor and keypair can therefore submit signature-valid activities attributed to any actor identity they name.

Severity

4.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 17:17 UTC

CWE

CWE-348 - Use of Less Trusted Source

Assigner

mitre CNA under the mitre root

CNA scorecard E 28/100 over 2325 records in the last 180 days details

References

1 reference

URL	Tags
https://codeberg.org/forgejo/forgejo/issues/14271…

Impacted products

1 product

Vendor	Product	Version	CPE status
Forgejo	Forgejo	Affected: 13.0.0 , ≤ 16.0.4 (semver) cpe:2.3:a:forgejo:forgejo::::::::

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-90679

Vulnerability from fkie_nvd - Published: 2026-09-13 04:17 - Updated: 2026-09-22 20:00

Severity

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

Summary

References

	URL	Tags
	cve@mitre.org	https://codeberg.org/forgejo/forgejo/issues/14271#issuecomment-22548004

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unknown",
          "product": "Forgejo",
          "repo": "https://codeberg.org/forgejo/forgejo",
          "vendor": "Forgejo",
          "versions": [
            {
              "lessThanOrEqual": "16.0.4",
              "status": "affected",
              "version": "13.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
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    }
  ],
  "id": "CVE-2026-90679",
  "lastModified": "2026-09-22T20:00:03.713",
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          "privilegesRequired": "LOW",
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GHSA-5CJJ-J77F-RQ2G

Vulnerability from github – Published: 2026-09-13 06:33 – Updated: 2026-09-13 06:33

Details

Severity

4.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-90679"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-348"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-13T04:17:25Z",
    "severity": "MODERATE"
  },
  "details": "Forgejo 13.0.0 through 16.0.4, when \"[federation] ENABLED = true\" is set, has a spoofing issue that affects identity integrity but does not allow account takeover or content modification. It does not verify that the HTTP Signature on an incoming ActivityPub activity was produced by the key belonging to the actor named in the activity body. The signature verification in routers/api/v1/activitypub/reqsignature.go validates the request signature, but the inbox activity handlers subsequently read the acting identity from the attacker-controlled JSON body without binding it to the verified signing key. Additionally, the signed Digest header is not recomputed against the received request body. A remote attacker who hosts a single valid ActivityPub actor and keypair can therefore submit signature-valid activities attributed to any actor identity they name.",
  "id": "GHSA-5cjj-j77f-rq2g",
  "modified": "2026-09-13T06:33:11Z",
  "published": "2026-09-13T06:33:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90679"
    },
    {
      "type": "WEB",
      "url": "https://codeberg.org/forgejo/forgejo/issues/14271#issuecomment-22548004"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

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

Sightings and recorded dates, grouped by day · UTC

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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.

Action not permitted

CVE-2026-90679 (GCVE-0-2026-90679)

FKIE_CVE-2026-90679

GHSA-5CJJ-J77F-RQ2G

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Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour