Vulnerability-Lookup

CVE-2026-85676 (GCVE-0-2026-85676)

Vulnerability from cvelistv5 – Published: 2026-09-04 14:32 – Updated: 2026-09-14 19:33

Title

Dub Open Redirect via Unrestricted redir_url Parameter

Summary

Dub contains an open redirect vulnerability in the redir_url query parameter that is accepted on every short link without validation or domain allowlist enforcement. Attackers can append the redir_url parameter to any short link to redirect visitors to arbitrary external URLs through the trusted Dub domain, bypassing destination blacklists and potentially enabling phishing attacks with link cloaking enabled.

Severity

5.3 (Medium)


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

4.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-14 19:20 UTC

CWE

CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://github.com/dubinc/dub/issues/4337	issue-tracking
https://github.com/dubinc/dub	product
https://github.com/dubinc/dub/blob/73415cf5e6be13…	technical-description
https://www.vulncheck.com/advisories/dub-open-red…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
dubinc	dub	Affected: 0 , ≤ 73415cf5e6be13ce9adb7ba5e97474307db34a17 (git)	guessed

Date Public

2026-08-16 00:00

Credits

George Chen

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-85676

Vulnerability from fkie_nvd - Published: 2026-09-04 15:17 - Updated: 2026-09-14 20:16

Severity

4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/dubinc/dub
	disclosure@vulncheck.com	https://github.com/dubinc/dub/blob/73415cf5e6be13ce9adb7ba5e97474307db34a17/apps/web/lib/middleware/utils/get-final-url.ts
	disclosure@vulncheck.com	https://github.com/dubinc/dub/issues/4337
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/dub-open-redirect-via-unrestricted-redir-url-parameter

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
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      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "dub",
          "vendor": "dubinc",
          "versions": [
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              "lessThanOrEqual": "73415cf5e6be13ce9adb7ba5e97474307db34a17",
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    }
  ],
  "id": "CVE-2026-85676",
  "lastModified": "2026-09-14T20:16:59.527",
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          "baseScore": 4.3,
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          "integrityImpact": "LOW",
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          "exploitMaturity": "NOT_DEFINED",
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          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
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          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "PASSIVE",
          "valueDensity": "NOT_DEFINED",
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    "ssvcV203": [
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  "published": "2026-09-04T15:17:45.923",
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      "url": "https://github.com/dubinc/dub"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/dubinc/dub/blob/73415cf5e6be13ce9adb7ba5e97474307db34a17/apps/web/lib/middleware/utils/get-final-url.ts"
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      "url": "https://www.vulncheck.com/advisories/dub-open-redirect-via-unrestricted-redir-url-parameter"
    }
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  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
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}

GHSA-VPV7-5WP2-C8XX

Vulnerability from github – Published: 2026-09-04 15:36 – Updated: 2026-09-04 15:36

Details

Severity

4.3 (Medium)


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

5.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-85676"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-04T15:17:45Z",
    "severity": "MODERATE"
  },
  "details": "Dub contains an open redirect vulnerability in the redir_url query parameter that is accepted on every short link without validation or domain allowlist enforcement. Attackers can append the redir_url parameter to any short link to redirect visitors to arbitrary external URLs through the trusted Dub domain, bypassing destination blacklists and potentially enabling phishing attacks with link cloaking enabled.",
  "id": "GHSA-vpv7-5wp2-c8xx",
  "modified": "2026-09-04T15:36:15Z",
  "published": "2026-09-04T15:36:15Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-85676"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dubinc/dub/issues/4337"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dubinc/dub"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dubinc/dub/blob/73415cf5e6be13ce9adb7ba5e97474307db34a17/apps/web/lib/middleware/utils/get-final-url.ts"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/dub-open-redirect-via-unrestricted-redir-url-parameter"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/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"
    }
  ]
}

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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

CVE-2026-85676 (GCVE-0-2026-85676)

FKIE_CVE-2026-85676

GHSA-VPV7-5WP2-C8XX

Tags

Sightings

Nomenclature

Related by attack behaviour