Vulnerability-Lookup

CVE-2026-9548 (GCVE-0-2026-9548)

Vulnerability from cvelistv5 – Published: 2026-08-28 07:08 – Updated: 2026-08-28 11:03

Summary

An improper neutralization of input during web page generation ('Cross-site Scripting') vulnerability in extract domain in Synology Chat Server before 2.4.5-22148 allows remote authenticated users, via a UI interaction, to read or write restricted files and conduct limited denial-of-service attacks in DSM.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-28 11:02 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

synology mitre root

References

1 reference

URL	Tags
https://www.synology.com/en-global/security/advis…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
Synology	Synology Chat Server	Affected: * , < 2.4.5-22148 (semver)	guessed

Credits

Warisse Valentin (Aytio)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-9548",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-28T11:02:23.550934Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-28T11:03:02.420Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "affected",
          "product": "Synology Chat Server",
          "vendor": "Synology",
          "versions": [
            {
              "lessThan": "2.4.5-22148",
              "status": "affected",
              "version": "*",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Warisse Valentin (Aytio)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "An improper neutralization of input during web page generation (\u0027Cross-site Scripting\u0027) vulnerability in extract domain in Synology Chat Server before 2.4.5-22148 allows remote authenticated users, via a UI interaction, to read or write restricted files and conduct limited denial-of-service attacks in DSM."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-28T07:08:51.584Z",
        "orgId": "db201096-a0cc-46c7-9a55-61d9e221bf01",
        "shortName": "synology"
      },
      "references": [
        {
          "name": "Synology-SA-26:10 Synology Chat Server",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.synology.com/en-global/security/advisory/Synology_SA_26_10"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "db201096-a0cc-46c7-9a55-61d9e221bf01",
    "assignerShortName": "synology",
    "cveId": "CVE-2026-9548",
    "datePublished": "2026-08-28T07:08:51.584Z",
    "dateReserved": "2026-05-26T07:01:48.490Z",
    "dateUpdated": "2026-08-28T11:03:02.420Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-9548",
      "date": "2026-08-28",
      "epss": "0.00241",
      "percentile": "0.15055"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-9548\",\"sourceIdentifier\":\"security@synology.com\",\"published\":\"2026-08-28T08:16:59.063\",\"lastModified\":\"2026-08-28T12:16:39.883\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"An improper neutralization of input during web page generation (\u0027Cross-site Scripting\u0027) vulnerability in extract domain in Synology Chat Server before 2.4.5-22148 allows remote authenticated users, via a UI interaction, to read or write restricted files and conduct limited denial-of-service attacks in DSM.\"}],\"affected\":[{\"source\":\"security@synology.com\",\"affectedData\":[{\"vendor\":\"Synology\",\"product\":\"Synology Chat Server\",\"defaultStatus\":\"affected\",\"versions\":[{\"version\":\"*\",\"lessThan\":\"2.4.5-22148\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security@synology.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L\",\"baseScore\":6.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"REQUIRED\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":2.3,\"impactScore\":3.7}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-08-28T11:02:23.550934Z\",\"id\":\"CVE-2026-9548\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"security@synology.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-79\"}]}],\"references\":[{\"url\":\"https://www.synology.com/en-global/security/advisory/Synology_SA_26_10\",\"source\":\"security@synology.com\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-9548\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-28T11:02:23.550934Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-28T11:02:54.954Z\"}}], \"cna\": {\"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Warisse Valentin (Aytio)\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"CHANGED\", \"version\": \"3.1\", \"baseScore\": 6.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"LOW\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"LOW\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Synology\", \"product\": \"Synology Chat Server\", \"versions\": [{\"status\": \"affected\", \"version\": \"*\", \"lessThan\": \"2.4.5-22148\", \"versionType\": \"semver\"}], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://www.synology.com/en-global/security/advisory/Synology_SA_26_10\", \"name\": \"Synology-SA-26:10 Synology Chat Server\", \"tags\": [\"vendor-advisory\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"An improper neutralization of input during web page generation (\u0027Cross-site Scripting\u0027) vulnerability in extract domain in Synology Chat Server before 2.4.5-22148 allows remote authenticated users, via a UI interaction, to read or write restricted files and conduct limited denial-of-service attacks in DSM.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-79\", \"description\": \"Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"db201096-a0cc-46c7-9a55-61d9e221bf01\", \"shortName\": \"synology\", \"dateUpdated\": \"2026-08-28T07:08:51.584Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-9548\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-28T11:03:02.420Z\", \"dateReserved\": \"2026-05-26T07:01:48.490Z\", \"assignerOrgId\": \"db201096-a0cc-46c7-9a55-61d9e221bf01\", \"datePublished\": \"2026-08-28T07:08:51.584Z\", \"assignerShortName\": \"synology\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

CERTFR-2026-AVI-0687

Vulnerability from certfr_avis - Published: 2026-06-04 - Updated: 2026-06-04

De multiples vulnérabilités ont été découvertes dans Synology Chat Server pour DSM. Certaines d'entre elles permettent à un attaquant de provoquer un déni de service à distance, une atteinte à la confidentialité des données et une atteinte à l'intégrité des données.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

Vendor	Product	Description
Synology	Chat Server pour DSM	Chat Server versions antérieures à 2.4.5-22148 pour DSM 7.2.1
Synology	Chat Server pour DSM	Chat Server versions antérieures à 2.4.5-22148 pour DSM 7.3
Synology	Chat Server pour DSM	Chat Server versions antérieures à 2.4.5-22148 pour DSM 7.2.2

References

Title

Publication Time

FKIE_CVE-2026-9548

Vulnerability from fkie_nvd - Published: 2026-08-28 08:16 - Updated: 2026-08-28 12:16

Severity

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

Summary

References

	URL	Tags
	security@synology.com	https://www.synology.com/en-global/security/advisory/Synology_SA_26_10

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "affected",
          "product": "Synology Chat Server",
          "vendor": "Synology",
          "versions": [
            {
              "lessThan": "2.4.5-22148",
              "status": "affected",
              "version": "*",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "security@synology.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An improper neutralization of input during web page generation (\u0027Cross-site Scripting\u0027) vulnerability in extract domain in Synology Chat Server before 2.4.5-22148 allows remote authenticated users, via a UI interaction, to read or write restricted files and conduct limited denial-of-service attacks in DSM."
    }
  ],
  "id": "CVE-2026-9548",
  "lastModified": "2026-08-28T12:16:39.883",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.3,
        "impactScore": 3.7,
        "source": "security@synology.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-9548",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-28T11:02:23.550934Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-28T08:16:59.063",
  "references": [
    {
      "source": "security@synology.com",
      "url": "https://www.synology.com/en-global/security/advisory/Synology_SA_26_10"
    }
  ],
  "sourceIdentifier": "security@synology.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security@synology.com",
      "type": "Secondary"
    }
  ]
}

GHSA-6788-84VH-FRQM

Vulnerability from github – Published: 2026-08-28 09:31 – Updated: 2026-08-28 09:31

Details

Severity

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-9548"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-28T08:16:59Z",
    "severity": "MODERATE"
  },
  "details": "An improper neutralization of input during web page generation (\u0027Cross-site Scripting\u0027) vulnerability in extract domain in Synology Chat Server before 2.4.5-22148 allows remote authenticated users, via a UI interaction, to read or write restricted files and conduct limited denial-of-service attacks in DSM.",
  "id": "GHSA-6788-84vh-frqm",
  "modified": "2026-08-28T09:31:51Z",
  "published": "2026-08-28T09:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9548"
    },
    {
      "type": "WEB",
      "url": "https://www.synology.com/en-global/security/advisory/Synology_SA_26_10"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L",
      "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.

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-2026-9548 (GCVE-0-2026-9548)

CERTFR-2026-AVI-0687

Solutions

FKIE_CVE-2026-9548

GHSA-6788-84VH-FRQM

Tags

Sightings

Nomenclature