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Luu, T.J.

🔥 This vulnerability is being actively exploited in the wild (CISA Known Exploited Vulnerabilities catalog)

CVE-2023-27351: PaperCut NG/MF Improper Authentication Vulnerability

infovulnerability🔥 Actively Exploited

security

Source: CISA Known Exploited VulnerabilitiesApril 19, 2026CVE-2023-27351

Summary

PaperCut NG/MF has an improper authentication vulnerability that allows remote attackers to bypass authentication (skipping the normal login process) through a flaw in the SecurityRequestFilter class. This vulnerability is actively being exploited by attackers in the real world.

Solution / Mitigation

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Vulnerability Details

EPSS (30-day exploit probability)

EPSS: 44.6%

Patch Available

Yes

Exploit Maturity

🔥 Actively Exploited

Disclosure Date

April 19, 2026

Classification

Attack SophisticationModerate

Taxonomy References

CWE (Weakness Type)

CWE-287

CAPEC (Attack Pattern)

CAPEC-114

Monthly digest — independent AI security research

Original source: https://nvd.nist.gov/vuln/detail/CVE-2023-27351

First tracked: April 20, 2026 at 08:00 PM

Classified by LLM (prompt v3) · confidence: 95%