CVE-2026-56734 (GCVE-0-2026-56734)

Vulnerability from cvelistv5 – Published: 2026-09-25 17:01 – Updated: 2026-09-25 17:01
VLAI
Title
Zammad: Avatar Image URL Server-Side Request Forwarding
Summary
Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2, during federated authentication (OAuth/OIDC/SAML), a profile image URL from the external identity provider is fetched without verifying the target address. An actor who controls their profile at a connected provider may cause the server to connect to internal network locations. Response timing and error patterns differ between reachable and unreachable targets, allowing internal service probing. Worker processes may be blocked for several seconds per request. Requires a configured external authentication provider where the actor can modify their profile image URL. This issue is fixed in version 7.0.2.
Severity
5.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
Impacted products
Vendor Product Version CPE status
zammad zammad Affected: < 7.0.2
guessed Create a notification for this product.
Show details on NVD website
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        }
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      "providerMetadata": {
        "dateUpdated": "2026-09-25T17:01:46.738Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
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        }
      ],
      "source": {
        "advisory": "GHSA-q3cr-3wq3-29hx",
        "discovery": "UNKNOWN"
      },
      "title": "Zammad: Avatar Image URL Server-Side Request Forwarding"
    }
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  "cveMetadata": {
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    "cveId": "CVE-2026-56734",
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    "dateReserved": "2026-06-22T19:17:28.959Z",
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          }
        ],
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        "lastModified": "2026-09-28T14:45:39.697",
        "metrics": {
          "cvssMetricV40": [
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                "modifiedSubIntegrityImpact": "NOT_DEFINED",
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                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
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                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "LOW",
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                "valueDensity": "NOT_DEFINED",
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}



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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.

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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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