Vulnerability-Lookup

CVE-2026-73629 (GCVE-0-2026-73629)

Vulnerability from cvelistv5 – Published: 2026-08-13 11:28 – Updated: 2026-08-14 18:10

Title

Serendipity before 2.6.0 SSRF via hex IPv4 and IPv6 addresses

Summary

Serendipity before 2.6.0 contains a server-side request forgery vulnerability in the serendipity_url_allowed() filter that fails to block hex-encoded IPv4 addresses, IPv6 literals, and link-local ranges. Authenticated users with adminImagesAdd permission can bypass the filter using alternate address formats to request internal services and retrieve response bodies through the public uploads directory.

Severity

8.4 (High)


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

8.5 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-14 18:02 UTC

CWE

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

Assigner

VulnCheck

References

2 references

URL	Tags
https://github.com/s9y/Serendipity/security/advis…	vendor-advisory
https://www.vulncheck.com/advisories/serendipity-…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
s9y	Serendipity	Affected: 0 , < 2.6.0 (semver) Unaffected: 2.6.0 (semver) cpe:2.3:a:s9y:serendipity::::::::

Date Public

2026-07-26 00:00

Credits

riodrwn

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-73629

Vulnerability from fkie_nvd - Published: 2026-08-13 12:17 - Updated: 2026-08-14 19:18

Severity

8.5 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/s9y/Serendipity/security/advisories/GHSA-2m48-gjj5-5x86
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/serendipity-before-ssrf-via-hex-ipv4-and-ipv6-addresses

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
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    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Serendipity",
          "vendor": "s9y",
          "versions": [
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    }
  ],
  "id": "CVE-2026-73629",
  "lastModified": "2026-08-14T19:18:00.917",
  "metrics": {
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        "impactScore": 4.7,
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
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    "cvssMetricV40": [
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          "Recovery": "NOT_DEFINED",
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}

GHSA-FH9H-CXRW-2XJ2

Vulnerability from github – Published: 2026-08-13 12:31 – Updated: 2026-08-13 12:31

Details

Severity

8.5 (High)


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

8.4 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-73629"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-13T12:17:28Z",
    "severity": "HIGH"
  },
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  "id": "GHSA-fh9h-cxrw-2xj2",
  "modified": "2026-08-13T12:31:11Z",
  "published": "2026-08-13T12:31:11Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/s9y/Serendipity/security/advisories/GHSA-2m48-gjj5-5x86"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73629"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/serendipity-before-ssrf-via-hex-ipv4-and-ipv6-addresses"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/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.

Action not permitted

CVE-2026-73629 (GCVE-0-2026-73629)

FKIE_CVE-2026-73629

GHSA-FH9H-CXRW-2XJ2

Tags

Sightings

Nomenclature