CRLF Injection vulnerability in SAP NetWeaver Application Server Java

published 2026-02-10 8mo ago modified 2026-06-17 4mo ago also EUVD-2026-6461

cvss: 3.4; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 9%
public exploits: 0; none known

Due to a CRLF Injection vulnerability in SAP NetWeaver Application Server Java, an authenticated attacker with administrative access could submit specially crafted content to the application. If processed by the application, this content enables injection of untrusted entries into generated configuration, allowing manipulation of application-controlled settings. Successful exploitation leads to a low impact on integrity, while confidentiality and availability remain unaffected.

Is CVE-2026-23686 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 8mo ago (2026-02-10)

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.1	3.4	CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:N/I:L/A:N
NVD	3.1	3.4	CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:N/I:L/A:N

Affected products

SAP_SE SAP NetWeaver Application Server Java

Classification

Weakness

CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers
CWE-436 Interpretation Conflict

References

url.sap /sapsecuritypatchday
vendor-advisory
me.sap.com /notes/3673213
permissions-required

Sources

CVE List CVE-2026-23686
NVD CVE-2026-23686

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.