Vulnerability-Lookup

CVE-2026-44502 (GCVE-0-2026-44502)

Vulnerability from cvelistv5 – Published: 2026-05-26 16:13 – Updated: 2026-05-27 17:21

Title

Bugsink: SSRF bypass in `validate_webhook_url`

Summary

Bugsink is a self-hosted error tracking tool. Prior to 2.1.3, Bugsink’s webhook URL validation could be (partially) bypassed because of a mismatch in URL parsing. The original validation logic parsed webhook URLs with Python’s urllib.parse.urlparse, then sent the request with requests.post. For malformed inputs involving backslashes and @, those components can disagree about where the authority ends and which hostname is the real target. A URL may therefore appear to target an allowlisted public hostname during validation, while the HTTP client actually connects to a different host. This vulnerability is fixed in 2.1.3.

Severity

4.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

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

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/bugsink/bugsink/security/advis…	x_refsource_CONFIRM
https://github.com/bugsink/bugsink/commit/940d2df…	x_refsource_MISC
https://github.com/bugsink/bugsink/releases/tag/2.1.3	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
bugsink	bugsink	Affected: < 2.1.3

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-44502

Vulnerability from fkie_nvd - Published: 2026-05-26 17:16 - Updated: 2026-05-26 19:37

Severity

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/bugsink/bugsink/commit/940d2df635e06803ef658666d734306942db5cc7
	security-advisories@github.com	https://github.com/bugsink/bugsink/releases/tag/2.1.3
	security-advisories@github.com	https://github.com/bugsink/bugsink/security/advisories/GHSA-fp53-qcf8-2xx2

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Bugsink is a self-hosted error tracking tool. Prior to 2.1.3, Bugsink\u2019s webhook URL validation could be (partially) bypassed because of a mismatch in URL parsing. The original validation logic parsed webhook URLs with Python\u2019s urllib.parse.urlparse, then sent the request with requests.post. For malformed inputs involving backslashes and @, those components can disagree about where the authority ends and which hostname is the real target. A URL may therefore appear to target an allowlisted public hostname during validation, while the HTTP client actually connects to a different host. This vulnerability is fixed in 2.1.3."
    }
  ],
  "id": "CVE-2026-44502",
  "lastModified": "2026-05-26T19:37:00.120",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
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          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-26T17:16:46.387",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bugsink/bugsink/commit/940d2df635e06803ef658666d734306942db5cc7"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bugsink/bugsink/releases/tag/2.1.3"
    },
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      "url": "https://github.com/bugsink/bugsink/security/advisories/GHSA-fp53-qcf8-2xx2"
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}

GHSA-FP53-QCF8-2XX2

Vulnerability from github – Published: 2026-05-08 19:09 – Updated: 2026-05-08 19:09

Summary

Bunsink has an SSRF bypass in `validate_webhook_url`

Details

Summary

Bugsink’s webhook URL validation in versions 2.1.2 and earlier could be (partially) bypassed because of a mismatch in URL parsing.

In some malformed URLs, Python’s standard URL parser (urllib) and the HTTP client stack (requests / urllib3) do not agree on which host is actually being targeted. That could allow a webhook URL to pass Bugsink’s outbound-host checks while the actual HTTP request is sent somewhere else.

Impact

This issue affects Bugsink’s outbound webhook integrations.

An attacker who can supply or influence a webhook URL may be able to make Bugsink send an outbound HTTP POST request to a host that should have been blocked by the webhook validation logic, including loopback, private, or otherwise non-allowlisted destinations.

The practical impact is limited:

this is an outbound webhook SSRF issue, not a general-purpose proxy
Bugsink does not follow redirects for these webhook requests
the request shape is constrained by how the malformed URL is normalized by the HTTP client
this does not give arbitrary control over every possible request path

In other words, this is a real validation bypass, but it is narrower than a full arbitrary-request primitive.

Technical Details

The original validation logic parsed webhook URLs with Python’s urllib.parse.urlparse, then sent the request with requests.post.

For malformed inputs involving backslashes and @, those components can disagree about where the authority ends and which hostname is the real target. A URL may therefore appear to target an allowlisted public hostname during validation, while the HTTP client actually connects to a different host.

Fix

The fix has two parts:

Bugsink now normalizes webhook URLs using the same HTTP client stack that will later send them, and applies validation to that normalized form.
Bugsink now outright rejects raw webhook URLs containing characters outside the RFC URL character set, rather than relying on downstream normalization of malformed input.

Together, these changes remove the parser discrepancy and make webhook URL handling stricter and more predictable.

Workarounds

If users cannot upgrade immediately:

restrict who can configure or modify webhook URLs
review existing webhook configurations for malformed or unusual URLs
prefer tightly controlled outbound network policy at the deployment level

Severity

4.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.1.2"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "bugsink"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-44502"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-08T19:09:04Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nBugsink\u2019s webhook URL validation in versions 2.1.2 and earlier could be (partially) bypassed because of a mismatch in URL parsing.\n\nIn some malformed URLs, Python\u2019s standard URL  parser (urllib) and the HTTP client stack (requests / urllib3) do not agree on which host is actually being targeted. That could allow a webhook URL to pass Bugsink\u2019s outbound-host checks while the actual HTTP request is sent somewhere else.\n\n## Impact\n\nThis issue affects Bugsink\u2019s outbound webhook integrations.\n\nAn attacker who can supply or influence a webhook URL may be able to make Bugsink send an outbound HTTP POST request to a host that should have been blocked by the webhook validation logic, including loopback,\nprivate, or otherwise non-allowlisted destinations.\n\nThe practical impact is limited:\n\n- this is an outbound webhook SSRF issue, not a general-purpose proxy\n- Bugsink does not follow redirects for these webhook requests\n- the request shape is constrained by how the malformed URL is normalized by the HTTP client\n- this does not give arbitrary control over every possible request path\n\nIn other words, this is a real validation bypass, but it is narrower than a full arbitrary-request primitive.\n\n## Technical Details\n\nThe original validation logic parsed webhook URLs with Python\u2019s urllib.parse.urlparse, then sent the request with requests.post.\n\nFor malformed inputs involving backslashes and @, those components can disagree about where the authority ends and which hostname is the real target. A URL may therefore appear to target an allowlisted public\nhostname during validation, while the HTTP client actually connects to a different host.\n\n## Fix\n\nThe fix has two parts:\n\n1. Bugsink now normalizes webhook URLs using the same HTTP client stack that will later send them, and applies validation to that normalized form.\n2. Bugsink now outright rejects raw webhook URLs containing characters outside the RFC URL character set, rather than relying on downstream normalization of malformed input.\n\nTogether, these changes remove the parser discrepancy and make webhook URL handling stricter and more predictable.\n\n## Workarounds\n\nIf users cannot upgrade immediately:\n\n- restrict who can configure or modify webhook URLs\n- review existing webhook configurations for malformed or unusual URLs\n- prefer tightly controlled outbound network policy at the deployment level",
  "id": "GHSA-fp53-qcf8-2xx2",
  "modified": "2026-05-08T19:09:04Z",
  "published": "2026-05-08T19:09:04Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/bugsink/bugsink/security/advisories/GHSA-fp53-qcf8-2xx2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bugsink/bugsink/commit/940d2df635e06803ef658666d734306942db5cc7"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/bugsink/bugsink"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bugsink/bugsink/releases/tag/2.1.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Bunsink has an SSRF bypass in `validate_webhook_url`"
}

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.

Action not permitted

CVE-2026-44502 (GCVE-0-2026-44502)

FKIE_CVE-2026-44502

GHSA-FP53-QCF8-2XX2

Summary

Impact

Technical Details

Fix

Workarounds

Tags

Sightings

Nomenclature