Security Digest · Vulnerability record
CVE-2026-27690: SAP Approuter Vulnerable to HTTP Request Smuggling
Due to an HTTP Request Smuggling vulnerability in SAP Approuter, an unauthenticated attacker could send a specially crafted HTTP request that leads to request-response desynchronization.
CVSS 9.1 Critical EPSS 0.7% · p52
Should you act?
Critical and remotely reachable
No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.7%, percentile 52: FIRST’s model estimates a 0.7% chance of exploitation activity in the next 30 days, higher than 52% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes
@sap/approuter(npm) < 20.10.0, fixed in 20.10.0. Check your lockfile, including transitive dependencies.
What it is
Due to an HTTP Request Smuggling vulnerability in SAP Approuter, an unauthenticated attacker could send a specially crafted HTTP request that leads to request-response desynchronization. This could result in the exposure of user responses and cause the system to become unavailable. This leads to a high impact on confidentiality and availability.
From the GitHub advisory
Due to an HTTP Request Smuggling vulnerability in SAP Approuter, an unauthenticated attacker could send a specially crafted HTTP request that leads to request-response desynchronization. This could result in the exposure of user responses and cause the system to become unavailable. This leads to a high impact on confidentiality and availability.
Weakness type: CWE-444.
Product: @sap/approuter (npm) · Assigned by: sap · Published: 2026-07-14
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| npm | @sap/approuter | < 20.10.0 | 20.10.0 |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| SAP_SE | SAP Approuter | SAP Approuter node.js package < 20.10.0 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| sap | 3.1 | 9.1 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
| GitHub | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: none
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none, automatable yes, technical impact total.
- FIRST EPSS (model of 2026-10-21): 0.68% probability of exploitation activity in the next 30 days; percentile 52.
Timeline
- — CVE record last updated
- — CVE record published by sap
- — GitHub-reviewed advisory GHSA-8m85-wqg7-c529 published (critical)
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-8m85-wqg7-c529 github.com
- CVE.org record CVE-2026-27690 cve.org
- NVD entry CVE-2026-27690 nvd.nist.gov
Other references from the CVE record and advisory
- me.sap.com me.sap.com
- url.sap url.sap