FKIE_CVE-2026-28509

Vulnerability from fkie_nvd - Published: 2026-03-06 05:16 - Updated: 2026-06-17 10:28
Severity
6.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Summary
LangBot is a global IM bot platform designed for LLMs. Prior to version 4.8.7, LangBot’s web UI renders user-supplied raw HTML using rehypeRaw, which can lead to a cross-site scripting (XSS) vulnerability. This issue has been patched in version 4.8.7.
References
security-advisories@github.comhttps://github.com/langbot-app/LangBot/commit/614621ab7b84fe50da3c6137705cde5a99429866Patch
security-advisories@github.comhttps://github.com/langbot-app/LangBot/security/advisories/GHSA-w8gq-g4pc-xh3hExploit, Vendor Advisory
Impacted products
Vendor Product Version
langbot langbot *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "LangBot",
          "vendor": "langbot-app",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.8.7"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:langbot:langbot:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "DB4F4942-F13E-40BD-8610-7E1244817691",
              "versionEndExcluding": "4.8.7",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "LangBot is a global IM bot platform designed for LLMs. Prior to version 4.8.7, LangBot\u2019s web UI renders user-supplied raw HTML using rehypeRaw, which can lead to a cross-site scripting (XSS) vulnerability. This issue has been patched in version 4.8.7."
    },
    {
      "lang": "es",
      "value": "LangBot es una plataforma global de bots de mensajer\u00eda instant\u00e1nea (IM) dise\u00f1ada para LLMs. Antes de la versi\u00f3n 4.8.7, la interfaz de usuario web de LangBot renderiza HTML sin procesar suministrado por el usuario utilizando rehypeRaw, lo que puede llevar a una vulnerabilidad de cross-site scripting (XSS). Este problema ha sido parcheado en la versi\u00f3n 4.8.7."
    }
  ],
  "id": "CVE-2026-28509",
  "lastModified": "2026-06-17T10:28:46.093",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.1,
        "impactScore": 4.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.3,
        "impactScore": 2.7,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-28509",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-03-06T15:50:37.548729Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-03-06T05:16:35.590",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/langbot-app/LangBot/commit/614621ab7b84fe50da3c6137705cde5a99429866"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/langbot-app/LangBot/security/advisories/GHSA-w8gq-g4pc-xh3h"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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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.

Sightings

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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.


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