{"id":"CVE-2026-73629","state":"PUBLISHED","title":"Serendipity before 2.6.0 SSRF via hex IPv4 and IPv6 addresses","description":"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.","publishedAt":"2026-08-13T11:28:27.670Z","updatedAt":"2026-08-14T18:10:11.924Z","severity":{"score":8.4,"label":"High","version":"4.0","vector":"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","source":"VulnCheck"},"assigner":"VulnCheck","products":["s9y Serendipity"],"affected":[{"vendor":"s9y","product":"Serendipity","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"2.6.0","versionType":"semver"},{"version":"2.6.0","status":"unaffected","versionType":"semver"}]}],"references":["https://github.com/s9y/Serendipity/security/advisories/GHSA-2m48-gjj5-5x86","https://www.vulncheck.com/advisories/serendipity-before-ssrf-via-hex-ipv4-and-ipv6-addresses"],"weaknesses":["CWE-918"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/73xxx/CVE-2026-73629.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-73629","state":"PUBLISHED","datePublished":"2026-08-13T11:28:27.670Z","dateUpdated":"2026-08-14T18:10:11.924Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-08-13T11:17:25.161Z"},"containers":{"cna":{"title":"Serendipity before 2.6.0 SSRF via hex IPv4 and IPv6 addresses","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"s9y","product":"Serendipity","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"2.6.0","versionType":"semver"},{"version":"2.6.0","status":"unaffected","versionType":"semver"}]}],"references":[{"url":"https://github.com/s9y/Serendipity/security/advisories/GHSA-2m48-gjj5-5x86","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-2m48-gjj5-5x86)"},{"url":"https://www.vulncheck.com/advisories/serendipity-before-ssrf-via-hex-ipv4-and-ipv6-addresses","name":"VulnCheck Advisory: Serendipity before 2.6.0 SSRF via hex IPv4 and IPv6 addresses","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","baseScore":8.4,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":8.5,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-08-13T11:28:27.670Z"},"datePublic":"2026-07-26T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:s9y:serendipity:*:*:*:*:*:*:*:*","versionEndExcluding":"2.6.0"}]}]}],"credits":[{"lang":"en","value":"riodrwn","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-14T18:02:53.517543Z","id":"CVE-2026-73629","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-14T18:10:11.924Z"}}]}}}