{"id":"CVE-2026-53500","state":"PUBLISHED","title":"Thumbor treats ALLOWED_SOURCES string patterns as unescaped regex, allowing hostname bypass via wildcard dot","description":"Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, the ALLOWED_SOURCES configuration passes plain strings to re.match() without escaping dots, so a hostname differing at dot positions can match the allowlist. This issue is fixed in 7.8.0.","publishedAt":"2026-07-31T18:35:54.234Z","updatedAt":"2026-07-31T23:30:44.046Z","severity":{"score":8.2,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["thumbor thumbor"],"affected":[{"vendor":"thumbor","product":"thumbor","versions":[{"version":"< 7.8.0","status":"affected"}]}],"references":["https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537","https://github.com/thumbor/thumbor/commit/68876715350c6c8f49c324e5515e64908830aed7","https://github.com/thumbor/thumbor/releases/tag/7.8.0"],"weaknesses":["CWE-918"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53500.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53500","state":"PUBLISHED","datePublished":"2026-07-31T18:35:54.234Z","dateUpdated":"2026-07-31T23:30:44.046Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-09T17:05:25.059Z"},"containers":{"cna":{"title":"Thumbor treats ALLOWED_SOURCES string patterns as unescaped regex, allowing hostname bypass via wildcard dot","descriptions":[{"lang":"en","value":"Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, the ALLOWED_SOURCES configuration passes plain strings to re.match() without escaping dots, so a hostname differing at dot positions can match the allowlist. This issue is fixed in 7.8.0."}],"affected":[{"vendor":"thumbor","product":"thumbor","versions":[{"version":"< 7.8.0","status":"affected"}]}],"references":[{"url":"https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537","name":"https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/thumbor/thumbor/commit/68876715350c6c8f49c324e5515e64908830aed7","name":"https://github.com/thumbor/thumbor/commit/68876715350c6c8f49c324e5515e64908830aed7","tags":["x_refsource_MISC"]},{"url":"https://github.com/thumbor/thumbor/releases/tag/7.8.0","name":"https://github.com/thumbor/thumbor/releases/tag/7.8.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918: Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-31T18:35:54.234Z"},"source":{"advisory":"GHSA-6x26-6r6f-m537","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-31T23:29:34.062473Z","id":"CVE-2026-53500","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-31T23:30:44.046Z"}}]}}}