{"id":"CVE-2026-106498","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-106498","generatedAt":"2026-10-28T05:28:18.506Z","title":"Prior to 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1, the @backstage/plugin-catalog-backend package is affected by improper url validation in catalog entity placeholder resolution.","description":"Backstage is an open framework for building developer portals. Prior to 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1, the @backstage/plugin-catalog-backend package is affected by improper url validation in catalog entity placeholder resolution. An authenticated Backstage user could craft a catalog entity with placeholder directives that reference resources outside the entity's source repository. Under certain configurations, this could allow access to data not intended to be available to the user. This issue is fixed in versions 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1.","published":"2026-10-06T22:17:05.000Z","lastModified":"2026-10-16T15:22:14.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":7.7,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"},"cwe":["CWE-863","CWE-918"],"affected":["linuxfoundation/backstage plugin-catalog-backend","linuxfoundation/backstage"],"epss":{"score":0.00307,"percentile":0.23353,"date":"2026-10-27","history":[{"date":"2026-10-07","score":0.00314,"percentile":0.22337}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.31%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-06T22:17:05.000Z","detail":{"score":"7.7","severity":"HIGH","publishedAt":"2026-10-06T22:17:04.713Z"},"summary":"New CVE, high severity (CVSS 7.7)."}],"references":[{"url":"https://github.com/backstage/backstage/commit/0b0f6fc89b4eb4872c76a498abbe1dc65998bb6e","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/commit/286bfc1f9cc3608a073b41016be302785be385d1","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/commit/61a10f19926aeda7f4a32de48d733e6710584634","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/commit/99729e925fd2bd40ba210022351a0ee6318e6197","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/commit/e786ac309ed2d775daf2309393c015c43902d6f6","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/releases/tag/v1.49.6","tags":["Patch","Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/releases/tag/v1.50.5","tags":["Patch","Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/releases/tag/v1.51.3","tags":["Patch","Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/releases/tag/v1.53.2","tags":["Patch","Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/releases/tag/v1.54.6","tags":["Patch","Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-qgvj-qcf8-xq73","tags":["Mitigation","Vendor Advisory"],"source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-106498","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}