{"id":"CVE-2026-66776","title":"SAP Approuter does not consistently enforce integrity verification on certain session-related request headers under specific conditions","summary":"SAP Approuter does not consistently enforce integrity verification on certain session-related request headers under specific conditions. An attacker with low privileges could send a specially crafted request that bypasses the integrity c…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N","cwe":["CWE-347"],"vendor":"sap","product":"approuter","affected":["approuter < 23.0.0"],"patched":["approuter 23.0.0"],"published":"2026-08-11","updated":"2026-09-08","sourceUpdated":"2026-09-08T20:21:54.847","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-66776","references":[{"url":"https://me.sap.com/notes/3786038","label":"cna@sap.com"},{"url":"https://url.sap/sapsecuritypatchday","label":"cna@sap.com"}],"tags":["nvd"],"epss":0.00131,"epssPercentile":0.0308,"ingestedAt":"2026-09-08T21:11:12.274Z","slug":"CVE-2026-66776","body":"## Overview\n\nSAP Approuter does not consistently enforce integrity verification on certain session-related request headers under specific conditions. An attacker with low privileges could send a specially crafted request that bypasses the integrity check and loads another user's session context. Successful exploitation requires the attacker to have previously observed matching session values out-of-band, which makes the attack complex to execute. This could result in a high impact on confidentiality and a low impact on integrity. There is no impact on availability.\n\n## Affected\n\n- `approuter < 23.0.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `approuter 23.0.0`","depth":"sunlit","depthScore":32,"depthScoreParts":{"impact":32.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}