GHSA-GQX7-99JW-6FPR

Vulnerability from github – Published: 2026-02-18 22:07 – Updated: 2026-02-18 22:07
VLAI?
Summary
LibreNMS affected by reflected xss via email field
Details

Summary

reflected xss via email field

Details

  1. visit http://127.0.0.1/settings/alerting/email
  2. in the email address input but this payload <img src=1 onerror=alert(document.cookie)>
  3. 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
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{
  "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": null,
    "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": "2026-02-18T22:07:06Z",
  "published": "2026-02-18T22:07:06Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/librenms/librenms/security/advisories/GHSA-gqx7-99jw-6fpr"
    },
    {
      "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 "
}


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Sightings

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  • 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.