Vulnerability-Lookup

GHSA-J7XR-PWQG-QW2Q

Vulnerability from github – Published: 2026-08-13 18:31 – Updated: 2026-08-13 18:31

Details

In Zimbra Collaboration (ZCS) before 10.1.17, weak cryptographic key generation vulnerability exists in the OnlyOffice integration. The zimbraDocumentEditingJwtSecret is generated using an insecure random number generator, resulting in insufficient entropy. An attacker who obtains a JWT signed with the generated secret may be able to recover the JWT signing secret through offline brute-force, potentially enabling JWT forgery.

Severity

6.3 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-73576"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1241"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-13T16:19:06Z",
    "severity": "MODERATE"
  },
  "details": "In Zimbra Collaboration (ZCS) before 10.1.17,\u00a0weak cryptographic key generation vulnerability exists in the OnlyOffice integration. The zimbraDocumentEditingJwtSecret is generated using an insecure random number generator, resulting in insufficient entropy. An attacker who obtains a JWT signed with the generated secret may be able to recover the JWT signing secret through offline brute-force, potentially enabling JWT forgery.",
  "id": "GHSA-j7xr-pwqg-qw2q",
  "modified": "2026-08-13T18:31:38Z",
  "published": "2026-08-13T18:31:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73576"
    },
    {
      "type": "WEB",
      "url": "https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy"
    },
    {
      "type": "WEB",
      "url": "https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-73576 (GCVE-0-2026-73576)

Vulnerability from cvelistv5 – Published: 2026-08-13 15:26 – Updated: 2026-08-13 15:58

Summary

Severity

6.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-13 15:49 UTC

CWE

CWE-1241 - Use of Predictable Algorithm in Random Number Generator

Assigner

mitre

References

2 references

URL	Tags
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
https://wiki.zimbra.com/wiki/Zimbra_Responsible_D…

Impacted products

1 product

Vendor	Product	Version
Zimbra	Collaboration	Affected: 0 , < 10.1.17 (custom)

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JSON

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  "containers": {
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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-73576",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-13T15:49:28.578529Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-13T15:58:52.960Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
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                }
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        }
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      "metrics": [
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          "cvssV3_1": {
            "attackComplexity": "HIGH",
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            "availabilityImpact": "NONE",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
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  },
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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-J7XR-PWQG-QW2Q

CVE-2026-73576 (GCVE-0-2026-73576)

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Sightings

Nomenclature