Vulnerability-Lookup

GHSA-R99G-F87J-9MPC

Vulnerability from github – Published: 2026-10-01 06:31 – Updated: 2026-10-01 06:31

Details

A security vulnerability has been detected in formtools.org Form Tools up to 3.1.1. This vulnerability affects the function Clients::updateClientSettingsTab of the file global/code/Clients.class.php of the component Client Settings. The manipulation of the argument page_titles leads to improper neutralization of special elements used in a template engine. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used. The project was informed of the problem early through an issue report but has not responded yet.

Severity

6.3 (Medium)


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

2.1 (Low)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-103540"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-791"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-01T06:17:04Z",
    "severity": "LOW"
  },
  "details": "A security vulnerability has been detected in formtools.org Form Tools up to 3.1.1. This vulnerability affects the function Clients::updateClientSettingsTab of the file global/code/Clients.class.php of the component Client Settings. The manipulation of the argument page_titles leads to improper neutralization of special elements used in a template engine. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used. The project was informed of the problem early through an issue report but has not responded yet.",
  "id": "GHSA-r99g-f87j-9mpc",
  "modified": "2026-10-01T06:31:26Z",
  "published": "2026-10-01T06:31:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103540"
    },
    {
      "type": "WEB",
      "url": "https://github.com/formtools/core/issues/956"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wawyw/cve_report/blob/main/formtools_1.md"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/cve/CVE-2026-103540"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/submit/957845"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/412350"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/412350/cti"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-103540 (GCVE-0-2026-103540)

Vulnerability from cvelistv5 – Published: 2026-10-01 05:15 – Updated: 2026-10-01 19:10

Title

formtools.org Form Tools Client Settings Clients.class.php updateClientSettingsTab special elements in template engine

Summary

Severity

5.3 (Medium)


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

6.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C

6.3 (Medium)


                        
                          CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-01 19:09 UTC

CWE

CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine
CWE-791 - Incomplete Filtering of Special Elements

Assigner

VulDB mitre root Scorecard

References

6 references

URL	Tags
https://vuldb.com/vuln/412350	vdb-entrytechnical-description
https://vuldb.com/vuln/412350/cti	signaturepermissions-required
https://vuldb.com/cve/CVE-2026-103540	third-party-advisory
https://vuldb.com/submit/957845	third-party-advisory
https://github.com/formtools/core/issues/956	issue-tracking
https://github.com/wawyw/cve_report/blob/main/for…	exploit

Impacted products

1 product

Vendor	Product	Version
formtools.org	Form Tools	Affected: 3.1.0 Affected: 3.1.1 cpe:2.3:a:form_tools:form_tools::::::::

Credits

wenyouwen (VulDB User) VulDB CNA Team

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-103540",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-01T19:09:46.335943Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-01T19:10:09.527Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:form_tools:form_tools:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "Client Settings"
          ],
          "product": "Form Tools",
          "vendor": "formtools.org",
          "versions": [
            {
              "status": "affected",
              "version": "3.1.0"
            },
            {
              "status": "affected",
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            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "wenyouwen (VulDB User)"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "VulDB CNA Team"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A security vulnerability has been detected in formtools.org Form Tools up to 3.1.1. This vulnerability affects the function Clients::updateClientSettingsTab of the file global/code/Clients.class.php of the component Client Settings. The manipulation of the argument page_titles leads to improper neutralization of special elements used in a template engine. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used. The project was informed of the problem early through an issue report but has not responded yet."
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      ],
      "metrics": [
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            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
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        },
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          "cvssV3_1": {
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C",
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          "cvssV3_0": {
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
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            "version": "3.0"
          }
        },
        {
          "cvssV2_0": {
            "baseScore": 6.5,
            "vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:C",
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      "problemTypes": [
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        {
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          "tags": [
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            "permissions-required"
          ],
          "url": "https://vuldb.com/vuln/412350/cti"
        },
        {
          "name": "CVE-2026-103540 | CVE Analysis and Report",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/cve/CVE-2026-103540"
        },
        {
          "name": "Submit #957845 | formtools.org / Form Tools project Form Tools Core 3.1.1 Server Side Template Injection",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/submit/957845"
        },
        {
          "tags": [
            "issue-tracking"
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          "url": "https://github.com/formtools/core/issues/956"
        },
        {
          "tags": [
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          "lang": "en",
          "time": "2026-09-30T02:00:00.000Z",
          "value": "VulDB entry created"
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          "lang": "en",
          "time": "2026-09-30T21:12:39.000Z",
          "value": "VulDB entry last update"
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      ],
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  },
  "cveMetadata": {
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
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    "datePublished": "2026-10-01T05:15:13.128Z",
    "dateReserved": "2026-09-30T19:07:30.951Z",
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    "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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GHSA-R99G-F87J-9MPC

CVE-2026-103540 (GCVE-0-2026-103540)

Tags

Sightings

Nomenclature

Related by attack behaviour