Vulnerability-Lookup

CVE-2026-25529 (GCVE-0-2026-25529)

Vulnerability from cvelistv5 – Published: 2026-03-12 16:35 – Updated: 2026-03-12 17:57

Title

Postal has HTML injection / XSS in message view

Summary

Postal is an open source SMTP server. Postal versions less than 3.3.5 had a HTML injection vulnerability that allowed unescaped data to be included in the admin interface. The primary way for unescaped data to be added is via the API's "send/raw" method. This could allow arbitrary HTML to be injected in to the page which may modify the page in a misleading way or allow for unauthorised javascript to be executed. Fixed in 3.3.5 and higher.

Severity

8.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-12 17:57 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/postalserver/postal/security/a…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version	CPE status
postalserver	postal	Affected: < 3.3.5	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-25529

Vulnerability from fkie_nvd - Published: 2026-03-12 17:16 - Updated: 2026-06-17 10:24

Severity

8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/postalserver/postal/security/advisories/GHSA-5f4r-5jpr-rfhc	Mitigation, Vendor Advisory

Impacted products

	Vendor	Product	Version
	postalserver	postal	*

JSON

To clipboard

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  "affected": [
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      "affectedData": [
        {
          "product": "postal",
          "vendor": "postalserver",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.3.5"
            }
          ]
        }
      ],
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    }
  ],
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    },
    {
      "lang": "es",
      "value": "Postal es un servidor SMTP de c\u00f3digo abierto. Las versiones de Postal anteriores a la 3.3.5 ten\u00edan una vulnerabilidad de inyecci\u00f3n HTML que permit\u00eda incluir datos sin escapar en la interfaz de administraci\u00f3n. La forma principal de a\u00f1adir datos sin escapar es a trav\u00e9s del m\u00e9todo \u0027send/raw\u0027 de la API. Esto podr\u00eda permitir la inyecci\u00f3n de HTML arbitrario en la p\u00e1gina, lo que podr\u00eda modificar la p\u00e1gina de forma enga\u00f1osa o permitir la ejecuci\u00f3n de javascript no autorizado. Corregido en la versi\u00f3n 3.3.5 y posteriores."
    }
  ],
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  "lastModified": "2026-06-17T10:24:47.993",
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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.