Vulnerability in SAP Approuter
CVE-2026-66776
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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (8.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 8.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001
Affected products
- SAP Approuter
- SAP Se Business Ai Platform (Approuter) — versions SAP Approuter node.js package < 23.0.0
Weakness classification (CWE)
References
- me.sap.com/notes/3786038 (Permissions Required)
- url.sap/sapsecuritypatchday (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-66776?
- CVE-2026-66776 is a medium-severity vulnerability in SAP Approuter, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.9/10. Published 2026-08-11.
- How severe is CVE-2026-66776?
- Medium severity. CVSS v3 base score is 5.9 out of 10.