Cyber Posture

CVE-2026-4276

High

Published: 16 March 2026

Published
16 March 2026
Modified
17 March 2026
KEV Added
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Patch
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CVSS Score 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS Score 0.0007 22.0th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-4276 is a high-severity an unspecified weakness vulnerability. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 22.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 AU-9 (Protection of Audit Information) and SI-10 (Information Input Validation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.
Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-10 Information Input Validation good match
prevent

Directly prevents log-injection by validating and sanitizing user inputs to the LibreChat RAG API before they are logged.

AU-9 Protection of Audit Information good match
prevent

Protects audit information from unauthorized modification, comprehensively mitigating the forging of log entries.

AU-6 Audit Record Review, Analysis, and Reporting partial match
detect

Enables review and analysis of audit records to identify forged or anomalous log entries introduced by the vulnerability.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1565.001 Stored Data Manipulation Impact
Adversaries may insert, delete, or manipulate data at rest in order to influence external outcomes or hide activity, thus threatening the integrity of the data.
attack.mitre.org →
Why these techniques?

Log injection vuln in public-facing RAG API directly enables remote exploitation via T1190 and achieves stored log data manipulation (T1565.001) to falsify entries and mislead monitoring/forensics.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

LibreChat RAG API, version 0.7.0, contains a log-injection vulnerability that allows attackers to forge log entries.

Deeper analysisAI

CVE-2026-4276 is a log-injection vulnerability affecting the LibreChat RAG API in version 0.7.0. Published on 2026-03-16, the flaw enables attackers to forge log entries. It carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N), indicating high severity primarily due to its impact on integrity.

Unauthenticated remote attackers can exploit this vulnerability over the network with low attack complexity and no user interaction. Exploitation allows forging log entries, which can mislead security monitoring, incident response, or forensic analysis by injecting false data into logs.

Mitigation guidance is available in the CERT vulnerability note at https://kb.cert.org/vuls/id/624941.

Details

CWE(s)
None listed

References