Vulnerability-Lookup

GHSA-Q5RH-MMP4-PPGQ

Vulnerability from github – Published: 2026-08-17 15:30 – Updated: 2026-08-17 15:30

Details

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the cmd_learn driver of the markasjunk plugin is subject to remote code execution via crafted placeholder replacement values. This issue only affects Roundcube instances using the markasjunk plugin with its cmd_learn driver.

Severity

8.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74997"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-78"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-17T13:16:54Z",
    "severity": "HIGH"
  },
  "details": "In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the cmd_learn driver of the markasjunk plugin is subject to remote code execution via crafted placeholder replacement values. This issue only affects Roundcube instances using the markasjunk plugin with its cmd_learn driver.",
  "id": "GHSA-q5rh-mmp4-ppgq",
  "modified": "2026-08-17T15:30:38Z",
  "published": "2026-08-17T15:30:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74997"
    },
    {
      "type": "WEB",
      "url": "https://github.com/roundcube/roundcubemail/commit/14044f843cfacbe78b042f659e379d6b4497aa7c"
    },
    {
      "type": "WEB",
      "url": "https://github.com/roundcube/roundcubemail/commit/495d211638f222336b20f4744545c53712426c2a"
    },
    {
      "type": "WEB",
      "url": "https://github.com/roundcube/roundcubemail/commit/b8f90e28a46d42e79a69568cba897f8f4223d9cd"
    },
    {
      "type": "WEB",
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.6.18"
    },
    {
      "type": "WEB",
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.7.3"
    },
    {
      "type": "WEB",
      "url": "https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74997 (GCVE-0-2026-74997)

Vulnerability from cvelistv5 – Published: 2026-08-17 12:37 – Updated: 2026-08-17 14:34

Summary

Severity

8.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-17 14:34 UTC

CWE

CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Assigner

mitre

References

6 references

URL	Tags
https://roundcube.net/news/2026/08/09/security-up…
https://github.com/roundcube/roundcubemail/releas…
https://github.com/roundcube/roundcubemail/commit…
https://github.com/roundcube/roundcubemail/commit…
https://github.com/roundcube/roundcubemail/releas…
https://github.com/roundcube/roundcubemail/commit…

Impacted products

1 product

Vendor	Product	Version
Roundcube	Webmail	Affected: 1.6.0 , < 1.6.18 (semver) Affected: 1.7.0 , < 1.7.3 (semver) cpe:2.3:a:roundcube:webmail:::::::: cpe:2.3:a:roundcube:webmail::::::::

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-74997",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-17T14:34:16.294775Z",
                "version": "2.0.3"
              },
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        "providerMetadata": {
          "dateUpdated": "2026-08-17T14:34:26.557Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Webmail",
          "vendor": "Roundcube",
          "versions": [
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              "lessThan": "1.6.18",
              "status": "affected",
              "version": "1.6.0",
              "versionType": "semver"
            },
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              "lessThan": "1.7.3",
              "status": "affected",
              "version": "1.7.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "1.6.18",
                  "versionStartIncluding": "1.6.0",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "1.7.3",
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      ],
      "descriptions": [
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          "lang": "en",
          "value": "In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the cmd_learn driver of the markasjunk plugin is subject to remote code execution via crafted placeholder replacement values. This issue only affects Roundcube instances using the markasjunk plugin with its cmd_learn driver."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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              "cweId": "CWE-78",
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          "url": "https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3"
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        {
          "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.6.18"
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        },
        {
          "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.7.3"
        },
        {
          "url": "https://github.com/roundcube/roundcubemail/commit/14044f843cfacbe78b042f659e379d6b4497aa7c"
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      "x_generator": {
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    "datePublished": "2026-08-17T12:37:45.126Z",
    "dateReserved": "2026-08-17T12:37:44.639Z",
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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

GHSA-Q5RH-MMP4-PPGQ

CVE-2026-74997 (GCVE-0-2026-74997)

Tags

Sightings

Nomenclature