{"id":"CVE-2026-16910","title":"Quay: ssrf in red hat quay notification webhooks (slack/generic)","summary":"A flaw was found in Red Hat Quay's notification webhook feature. The Slack and generic webhook notification handlers accept user-supplied URLs without SSRF validation, allowing a repository administrator to make the Quay worker issue POS…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N","cvssSource":"cna","cwe":["CWE-918"],"vendor":"Red Hat","product":"openshift-update-service/openshift-update-service-rhel8","affected":["openshift-update-service/openshift-update-service-rhel8 (all versions)","quay/quay-rhel8","quay/quay-rhel9 (all versions)"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-07-24T10:55:31.656441Z"},"published":"2026-07-24","updated":"2026-11-01","sourceUpdated":"2026-11-01T05:06:49.126Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-16910","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-16910"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2506685","label":"RHBZ#2506685"}],"tags":["cve.org"],"epss":0.00288,"epssPercentile":0.21447,"ingestedAt":"2026-11-05T18:28:50.695Z","slug":"CVE-2026-16910","body":"## Overview\n\nA flaw was found in Red Hat Quay's notification webhook feature. The Slack and generic webhook notification handlers accept user-supplied URLs without SSRF validation, allowing a repository administrator to make the Quay worker issue POST requests to internal network addresses or cloud infrastructure endpoints that should not be reachable from the application.\n\n## Affected\n\n- `openshift-update-service/openshift-update-service-rhel8 (all versions)`\n- `quay/quay-rhel8`\n- `quay/quay-rhel9 (all versions)`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n### Workarounds\n\nRestrict network egress from Quay worker pods/containers using network policies or firewall rules to block outbound connections to internal network ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) and cloud metadata endpoints (169.254.169.254). Limit repository creation and admin privileges to trusted users. Configure WEBHOOK_HOSTNAME_BLACKLIST in Quay config to include known internal hostnames and IP ranges.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}