Vulnerability-Lookup

GHSA-J947-85XJ-MVC2

Vulnerability from github – Published: 2026-10-27 12:30 – Updated: 2026-10-27 12:30

Details

The twofactor_gauthenticator plugin for Roundcube is vulnerable to brute-forcing of the second-factor code. Due to the lack of rate limiting, an attacker who obtains user's password can submit arbitrary 6-digit codes, resulting in second-factor bypass and unauthorized access to the system.

This issue was fixed in commit 4640889.

Severity

6.3 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-107145"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-307"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-27T10:16:54Z",
    "severity": "MODERATE"
  },
  "details": "The twofactor_gauthenticator plugin for Roundcube is vulnerable to brute-forcing of the second-factor code. Due to the lack of rate limiting, an attacker who obtains user\u0027s password can submit arbitrary 6-digit codes, resulting in second-factor bypass and unauthorized access to the system.\n\n\n\n\nThis issue was fixed in commit 4640889.",
  "id": "GHSA-j947-85xj-mvc2",
  "modified": "2026-10-27T12:30:44Z",
  "published": "2026-10-27T12:30:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-107145"
    },
    {
      "type": "WEB",
      "url": "https://cert.pl/en/posts/2026/10/CVE-2026-107145"
    },
    {
      "type": "WEB",
      "url": "https://github.com/alexandregz/twofactor_gauthenticator/blob/master/CHANGES-2FA-SECURITY.en.md"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/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-2026-107145 (GCVE-0-2026-107145)

Vulnerability from cvelistv5 – Published: 2026-10-27 09:34 – Updated: 2026-10-27 09:34 X_Open Source

Title

Lack of rate-limiting in 2fa code check mechanism in twofactor_gauthenticator

Summary

Severity

6.3 (Medium)


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

CWE

CWE-307 - Improper restriction of excessive authentication attempts

Assigner

CERT-PL CNA under the ENISA root

CNA scorecard B 81/100 over 240 records in the last 180 days details

References

2 references

URL	Tags
https://cert.pl/en/posts/2026/10/CVE-2026-107145	third-party-advisory
https://github.com/alexandregz/twofactor_gauthent…	patch

Impacted products

1 product

Vendor	Product	Version
alexandregz	twofactor_gauthenticator	Affected: 0 , < 4640889 (git) cpe:2.3:a:alexandregz:twofactor_gauthenticator::::::::

Credits

Marek Figielski (Vanilla.pl)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "collectionURL": "https://github.com",
          "defaultStatus": "unaffected",
          "product": "twofactor_gauthenticator",
          "repo": "https://github.com/alexandregz/twofactor_gauthenticator",
          "vendor": "alexandregz",
          "versions": [
            {
              "lessThan": "4640889",
              "status": "affected",
              "version": "0",
              "versionType": "git"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:a:alexandregz:twofactor_gauthenticator:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "0",
                  "vulnerable": true
                }
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              "operator": "OR"
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          "operator": "OR"
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      ],
      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "Marek Figielski (Vanilla.pl)"
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            }
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        }
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      "impacts": [
        {
          "capecId": "CAPEC-112",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-112 Brute Force"
            }
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        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
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            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
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            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
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            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "LOW",
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
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              "lang": "en",
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        "dateUpdated": "2026-10-27T09:34:36.692Z",
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      "references": [
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          "tags": [
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          ],
          "url": "https://github.com/alexandregz/twofactor_gauthenticator/blob/master/CHANGES-2FA-SECURITY.en.md"
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      "source": {
        "discovery": "EXTERNAL"
      },
      "tags": [
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      "title": "Lack of rate-limiting in 2fa code check mechanism in twofactor_gauthenticator",
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    "dateReserved": "2026-10-07T08:44:03.177Z",
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    "state": "PUBLISHED"
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}

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.

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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.
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