CVE-2026-34838 (GCVE-0-2026-34838)

Vulnerability from cvelistv5 – Published: 2026-04-02 19:15 – Updated: 2026-04-03 12:55
VLAI
Title
Group-Office: Authenticated Remote Code Execution via PHP Insecure Deserialization in `AbstractSettingsCollection`
Summary
Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.156, 25.0.90, and 26.0.12, a vulnerability in the AbstractSettingsCollection model leads to insecure deserialization when these settings are loaded. By injecting a serialized FileCookieJar object into a setting string, an authenticated attacker can achieve Arbitrary File Write, leading directly to Remote Code Execution (RCE) on the server. This issue has been patched in versions 6.8.156, 25.0.90, and 26.0.12.
Severity
10 (Critical)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
References
Impacted products
Vendor Product Version
Intermesh groupoffice Affected: < 6.8.156
Affected: < 25.0.90
Affected: < 26.0.12
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-34838",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-03T12:55:40.674883Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-03T12:55:48.631Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "groupoffice",
          "vendor": "Intermesh",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 6.8.156"
            },
            {
              "status": "affected",
              "version": "\u003c 25.0.90"
            },
            {
              "status": "affected",
              "version": "\u003c 26.0.12"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.156, 25.0.90, and 26.0.12, a vulnerability in the AbstractSettingsCollection model leads to insecure deserialization when these settings are loaded. By injecting a serialized FileCookieJar object into a setting string, an authenticated attacker can achieve Arbitrary File Write, leading directly to Remote Code Execution (RCE) on the server. This issue has been patched in versions 6.8.156, 25.0.90, and 26.0.12."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 10,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-502",
              "description": "CWE-502: Deserialization of Untrusted Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-02T19:15:40.591Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/Intermesh/groupoffice/security/advisories/GHSA-h22j-frrf-5vxq",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/Intermesh/groupoffice/security/advisories/GHSA-h22j-frrf-5vxq"
        },
        {
          "name": "https://github.com/Intermesh/groupoffice/releases/tag/v25.0.90",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Intermesh/groupoffice/releases/tag/v25.0.90"
        },
        {
          "name": "https://github.com/Intermesh/groupoffice/releases/tag/v26.0.12",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Intermesh/groupoffice/releases/tag/v26.0.12"
        },
        {
          "name": "https://github.com/Intermesh/groupoffice/releases/tag/v6.8.156",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Intermesh/groupoffice/releases/tag/v6.8.156"
        }
      ],
      "source": {
        "advisory": "GHSA-h22j-frrf-5vxq",
        "discovery": "UNKNOWN"
      },
      "title": "Group-Office: Authenticated Remote Code Execution via PHP Insecure Deserialization in `AbstractSettingsCollection`"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-34838",
    "datePublished": "2026-04-02T19:15:40.591Z",
    "dateReserved": "2026-03-30T20:52:53.284Z",
    "dateUpdated": "2026-04-03T12:55:48.631Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-34838",
      "date": "2026-07-31",
      "epss": "0.01026",
      "percentile": "0.60173"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-34838\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-04-02T20:16:28.150\",\"lastModified\":\"2026-07-24T21:10:00.143\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.156, 25.0.90, and 26.0.12, a vulnerability in the AbstractSettingsCollection model leads to insecure deserialization when these settings are loaded. By injecting a serialized FileCookieJar object into a setting string, an authenticated attacker can achieve Arbitrary File Write, leading directly to Remote Code Execution (RCE) on the server. This issue has been patched in versions 6.8.156, 25.0.90, and 26.0.12.\"},{\"lang\":\"es\",\"value\":\"Group-Office es una herramienta de gesti\u00f3n de relaciones con clientes empresariales y de groupware. Antes de las versiones 6.8.156, 25.0.90 y 26.0.12, una vulnerabilidad en el modelo AbstractSettingsCollection conduce a deserializaci\u00f3n insegura cuando estas configuraciones son cargadas. Al inyectar un objeto FileCookieJar serializado en una cadena de configuraci\u00f3n, un atacante autenticado puede lograr escritura arbitraria de archivos, lo que conduce directamente a ejecuci\u00f3n remota de c\u00f3digo (RCE) en el servidor. Este problema ha sido parcheado en las versiones 6.8.156, 25.0.90 y 26.0.12.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"Intermesh\",\"product\":\"groupoffice\",\"versions\":[{\"version\":\"\u003c 6.8.156\",\"status\":\"affected\"},{\"version\":\"\u003c 25.0.90\",\"status\":\"affected\"},{\"version\":\"\u003c 26.0.12\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":9.9,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.1,\"impactScore\":6.0}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-04-03T12:55:40.674883Z\",\"id\":\"CVE-2026-34838\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-502\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:intermesh:group-office:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"6.8.156\",\"matchCriteriaId\":\"58242448-BF4C-435F-8DAA-FC1F28CD181B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:intermesh:group-office:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"25.0.1\",\"versionEndExcluding\":\"25.0.90\",\"matchCriteriaId\":\"1CA282F8-C073-4224-B3D0-5F1103FFE93F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:intermesh:group-office:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"26.0.1\",\"versionEndExcluding\":\"26.0.12\",\"matchCriteriaId\":\"903696F9-950E-4D3F-8F0B-613C6C599F98\"}]}]}],\"references\":[{\"url\":\"https://github.com/Intermesh/groupoffice/releases/tag/v25.0.90\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Release Notes\"]},{\"url\":\"https://github.com/Intermesh/groupoffice/releases/tag/v26.0.12\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Release Notes\"]},{\"url\":\"https://github.com/Intermesh/groupoffice/releases/tag/v6.8.156\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Release Notes\"]},{\"url\":\"https://github.com/Intermesh/groupoffice/security/advisories/GHSA-h22j-frrf-5vxq\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Vendor Advisory\"]}]}}",
    "redhat_vex": {
      "current_release_date": "2026-04-03T23:01:46+00:00",
      "cve": "CVE-2026-34838",
      "id": "CVE-2026-34838",
      "initial_release_date": "2026-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Group-Office: Authenticated Remote Code Execution via PHP Insecure Deserialization in `AbstractSettingsCollection`",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34838.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-34838\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-03T12:55:40.674883Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-03T12:55:45.217Z\"}}], \"cna\": {\"title\": \"Group-Office: Authenticated Remote Code Execution via PHP Insecure Deserialization in `AbstractSettingsCollection`\", \"source\": {\"advisory\": \"GHSA-h22j-frrf-5vxq\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"CHANGED\", \"version\": \"3.1\", \"baseScore\": 10, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"CRITICAL\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"Intermesh\", \"product\": \"groupoffice\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 6.8.156\"}, {\"status\": \"affected\", \"version\": \"\u003c 25.0.90\"}, {\"status\": \"affected\", \"version\": \"\u003c 26.0.12\"}]}], \"references\": [{\"url\": \"https://github.com/Intermesh/groupoffice/security/advisories/GHSA-h22j-frrf-5vxq\", \"name\": \"https://github.com/Intermesh/groupoffice/security/advisories/GHSA-h22j-frrf-5vxq\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/Intermesh/groupoffice/releases/tag/v25.0.90\", \"name\": \"https://github.com/Intermesh/groupoffice/releases/tag/v25.0.90\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/Intermesh/groupoffice/releases/tag/v26.0.12\", \"name\": \"https://github.com/Intermesh/groupoffice/releases/tag/v26.0.12\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/Intermesh/groupoffice/releases/tag/v6.8.156\", \"name\": \"https://github.com/Intermesh/groupoffice/releases/tag/v6.8.156\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.156, 25.0.90, and 26.0.12, a vulnerability in the AbstractSettingsCollection model leads to insecure deserialization when these settings are loaded. By injecting a serialized FileCookieJar object into a setting string, an authenticated attacker can achieve Arbitrary File Write, leading directly to Remote Code Execution (RCE) on the server. This issue has been patched in versions 6.8.156, 25.0.90, and 26.0.12.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-502\", \"description\": \"CWE-502: Deserialization of Untrusted Data\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-04-02T19:15:40.591Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-34838\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-03T12:55:48.631Z\", \"dateReserved\": \"2026-03-30T20:52:53.284Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-04-02T19:15:40.591Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.