Vulnerability-Lookup

CVE-2026-45551 (GCVE-0-2026-45551)

Vulnerability from cvelistv5 – Published: 2026-05-29 12:34 – Updated: 2026-05-29 13:16

Title

Group-Office: Authenticated Stored XSS in Administrator Context via Arbitrary Cross-User Setting Write

Summary

Group-Office is an enterprise customer relationship management and groupware tool. Prior to 26.0.25, 25.0.100, and 6.8.165, GroupOffice allows authenticated users to persist arbitrary legacy settings for any user_id via index.php?r=core/saveSetting. A separate client-side sink in the email module injects the email_font_size setting directly into JavaScript without escaping. By combining these two issues, any low-privileged authenticated user can overwrite an administrator's email_font_size setting with a JavaScript payload and trigger stored XSS in the administrator's browser when the GroupOffice web client loads views/Extjs3/modulescripts.php. This vulnerability is fixed in 26.0.25, 25.0.100, and 6.8.165.

Severity

5.1 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-29 13:16 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-639 - Authorization Bypass Through User-Controlled Key

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/Intermesh/groupoffice/security…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version	CPE status
Intermesh	groupoffice	Affected: >= 26.0.1, < 26.0.25 Affected: >= 25.0.1, < 25.0.1005 Affected: < 6.8.165	guessed

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2026-45551

Vulnerability from fkie_nvd - Published: 2026-05-29 13:16 - Updated: 2026-07-21 12:10

Severity

5.1 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/Intermesh/groupoffice/security/advisories/GHSA-9w92-p32g-g99p
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/Intermesh/groupoffice/security/advisories/GHSA-9w92-p32g-g99p

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "groupoffice",
          "vendor": "Intermesh",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 26.0.1, \u003c 26.0.25"
            },
            {
              "status": "affected",
              "version": "\u003e= 25.0.1, \u003c 25.0.1005"
            },
            {
              "status": "affected",
              "version": "\u003c 6.8.165"
            }
          ]
        }
      ],
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    }
  ],
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      "lang": "en",
      "value": "Group-Office is an enterprise customer relationship management and groupware tool. Prior to 26.0.25, 25.0.100, and 6.8.165, GroupOffice allows authenticated users to persist arbitrary legacy settings for any user_id via index.php?r=core/saveSetting. A separate client-side sink in the email module injects the email_font_size setting directly into JavaScript without escaping. By combining these two issues, any low-privileged authenticated user can overwrite an administrator\u0027s email_font_size setting with a JavaScript payload and trigger stored XSS in the administrator\u0027s browser when the GroupOffice web client loads views/Extjs3/modulescripts.php. This vulnerability is fixed in 26.0.25, 25.0.100, and 6.8.165."
    },
    {
      "lang": "es",
      "value": "Group-Office es una herramienta empresarial de gesti\u00f3n de relaciones con el cliente y groupware. Antes de las versiones 26.0.25, 25.0.100 y 6.8.165, GroupOffice permite a los usuarios autenticados persistir configuraciones heredadas arbitrarias para cualquier user_id a trav\u00e9s de index.php?r=core/saveSetting. Un sumidero separado del lado del cliente en el m\u00f3dulo de correo electr\u00f3nico inyecta la configuraci\u00f3n email_font_size directamente en JavaScript sin escapar. Al combinar estos dos problemas, cualquier usuario autenticado con bajos privilegios puede sobrescribir la configuraci\u00f3n email_font_size de un administrador con una carga \u00fatil de JavaScript y activar XSS almacenado en el navegador del administrador cuando el cliente web de GroupOffice carga views/Extjs3/modulescripts.php. Esta vulnerabilidad se corrige en las versiones 26.0.25, 25.0.100 y 6.8.165."
    }
  ],
  "id": "CVE-2026-45551",
  "lastModified": "2026-07-21T12:10:00.090",
  "metrics": {
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          "Recovery": "NOT_DEFINED",
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          "exploitMaturity": "NOT_DEFINED",
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          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
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          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "LOW",
          "subIntegrityImpact": "LOW",
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          "valueDensity": "NOT_DEFINED",
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    "ssvcV203": [
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.