Vulnerability-Lookup

GHSA-GQX7-99JW-6FPR

Vulnerability from github – Published: 2026-02-18 22:07 – Updated: 2026-02-20 16:48

Summary

LibreNMS affected by reflected xss via email field

Details

Summary

reflected xss via email field

Details

visit http://127.0.0.1/settings/alerting/email
in the email address input but this payload <img src=1 onerror=alert(document.cookie)>
notice the alert

PoC

video attached with the report https://github.com/user-attachments/assets/c1b443f5-85c6-4545-b04f-def06d82b42e

Impact

can lead to ATO

Severity

5.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "librenms/librenms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-26987"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-18T22:07:06Z",
    "nvd_published_at": "2026-02-20T02:16:54Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\nreflected xss via email field \n\n### Details\n 1. visit `http://127.0.0.1/settings/alerting/email`\n 2. in the email address input but this payload \n `\u003cimg src=1 onerror=alert(document.cookie)\u003e` \n3. notice the alert \n### PoC\n- video attached with the report\nhttps://github.com/user-attachments/assets/c1b443f5-85c6-4545-b04f-def06d82b42e\n\n\n### Impact\ncan lead to ATO",
  "id": "GHSA-gqx7-99jw-6fpr",
  "modified": "2026-02-20T16:48:17Z",
  "published": "2026-02-18T22:07:06Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/librenms/librenms/security/advisories/GHSA-gqx7-99jw-6fpr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26987"
    },
    {
      "type": "WEB",
      "url": "https://github.com/librenms/librenms/pull/19038"
    },
    {
      "type": "WEB",
      "url": "https://github.com/librenms/librenms/commit/8e626b38ef92e240532cdac2ac7e38706a71208b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/librenms/librenms"
    },
    {
      "type": "WEB",
      "url": "https://github.com/librenms/librenms/releases/tag/26.2.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "LibreNMS affected by reflected xss via email field "
}

CVE-2026-26987 (GCVE-0-2026-26987)

Vulnerability from cvelistv5 – Published: 2026-02-20 01:11 – Updated: 2026-02-20 15:35

Title

LibreNMS affected by reflected XSS via email field

Summary

LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 25.12.0 and below are vulnerable to Reflected XSS attacks via email field. This issue has been fixed in version 26.2.0.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-02-20 15:31 UTC

CWE

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

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/librenms/librenms/security/adv…	x_refsource_CONFIRM
https://github.com/librenms/librenms/pull/19038	x_refsource_MISC
https://github.com/librenms/librenms/commit/8e626…	x_refsource_MISC
https://github.com/librenms/librenms/releases/tag…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
librenms	librenms	Affected: < 26.2.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-26987",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-20T15:31:42.695704Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-20T15:35:18.059Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "librenms",
          "vendor": "librenms",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 26.2.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 25.12.0 and below are vulnerable to  Reflected XSS attacks via email field. This issue has been fixed in version 26.2.0."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "PASSIVE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-20T01:11:13.925Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/librenms/librenms/security/advisories/GHSA-gqx7-99jw-6fpr",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/librenms/librenms/security/advisories/GHSA-gqx7-99jw-6fpr"
        },
        {
          "name": "https://github.com/librenms/librenms/pull/19038",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/librenms/librenms/pull/19038"
        },
        {
          "name": "https://github.com/librenms/librenms/commit/8e626b38ef92e240532cdac2ac7e38706a71208b",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/librenms/librenms/commit/8e626b38ef92e240532cdac2ac7e38706a71208b"
        },
        {
          "name": "https://github.com/librenms/librenms/releases/tag/26.2.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/librenms/librenms/releases/tag/26.2.0"
        }
      ],
      "source": {
        "advisory": "GHSA-gqx7-99jw-6fpr",
        "discovery": "UNKNOWN"
      },
      "title": "LibreNMS affected by reflected XSS via email field"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-26987",
    "datePublished": "2026-02-20T01:11:13.925Z",
    "dateReserved": "2026-02-17T01:41:24.606Z",
    "dateUpdated": "2026-02-20T15:35:18.059Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

GHSA-GQX7-99JW-6FPR

Summary

Details

PoC

Impact

CVE-2026-26987 (GCVE-0-2026-26987)

Tags

Sightings

Nomenclature

Related by attack behaviour