Vulnerability-Lookup

CVE-2026-9818 (GCVE-0-2026-9818)

Vulnerability from cvelistv5 – Published: 2026-05-28 12:16 – Updated: 2026-05-28 16:35

This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.

Show details on NVD website

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        "dateUpdated": "2026-05-28T16:35:38.661Z",
        "orgId": "6064c9f1-42e5-4cc5-a67a-1636d7a9d3fd",
        "shortName": "OCD"
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    "cveId": "CVE-2026-9818",
    "datePublished": "2026-05-28T12:16:05.464Z",
    "dateRejected": "2026-05-28T16:35:38.661Z",
    "dateReserved": "2026-05-28T10:37:45.625Z",
    "dateUpdated": "2026-05-28T16:35:38.661Z",
    "state": "REJECTED"
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  "dataType": "CVE_RECORD",
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GHSA-MHGJ-JXXF-GXJ9

Vulnerability from github – Published: 2026-05-28 15:39 – Updated: 2026-05-28 15:39

Details

Roundcube's HTML sanitization path for message rendering allows loopback, localhost, RFC1918, link-local, and ULA URLs even when remote content loading is disabled. A remote attacker can send an HTML email that causes the victim's browser to issue requests to local or private-network services simply by opening the message preview.

Severity ?

4.7 (Medium)


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

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-9818"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-184"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-28T13:16:25Z",
    "severity": "MODERATE"
  },
  "details": "Roundcube\u0027s HTML sanitization path for message rendering allows loopback, localhost, RFC1918, link-local, and ULA URLs even when remote content loading is disabled. A remote attacker can send an HTML email that causes the victim\u0027s browser to issue requests to local or private-network services simply by opening the message preview.",
  "id": "GHSA-mhgj-jxxf-gxj9",
  "modified": "2026-05-28T15:39:50Z",
  "published": "2026-05-28T15:39:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9818"
    },
    {
      "type": "WEB",
      "url": "https://github.com/roundcube/roundcubemail/commit/7b52353653a67e6073b97d70eb94047132b78556"
    },
    {
      "type": "WEB",
      "url": "https://github.com/roundcube/roundcubemail/commit/faf867432f51ebbe100382a70a9e3c042415ee1b"
    },
    {
      "type": "WEB",
      "url": "https://advisories.orangecyberdefense.com/advisories/163"
    },
    {
      "type": "WEB",
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.6.16"
    },
    {
      "type": "WEB",
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.7.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

FKIE_CVE-2026-9818

Vulnerability from fkie_nvd - Published: 2026-05-28 13:16 - Updated: 2026-05-28 17:16

Severity ?

Summary

Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.

References

	URL	Tags

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority."
    }
  ],
  "id": "CVE-2026-9818",
  "lastModified": "2026-05-28T17:16:36.090",
  "metrics": {},
  "published": "2026-05-28T13:16:25.440",
  "references": [],
  "sourceIdentifier": "6064c9f1-42e5-4cc5-a67a-1636d7a9d3fd",
  "vulnStatus": "Rejected"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

CVE-2026-9818 (GCVE-0-2026-9818)

GHSA-MHGJ-JXXF-GXJ9

FKIE_CVE-2026-9818

Tags

Sightings

Nomenclature