October 13, 2026

CVE Watchtower

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CVE-2023-27351NVD

Vulnerability Summary

This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914). Authentication is not required to exploit this vulnerability. The specific flaw exists within the SecurityRequestFilter class. The issue results from improper implementation of the authentication algorithm. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-19226.
Severity Level
HIGH(7.5)
Published Date
Apr 20, 2023
Last Modified
Oct 1, 2026
PoC
Available(Nuclei)
Exploitation Status
ACTIVE
EPSS Score (30-Day)
78.05%Probability
Root Weakness (CWE)
CWE-287: Improper Authentication ↗
When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.
CVSS v3.1 Base Metrics — Score 7.5 (HIGH)
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone

Affected & Patched Versions

Affected Versions
  • Papercut Papercut Mf >= 15.0 and < 20.1.7
  • Papercut Papercut Mf >= 21.0.0 and < 21.2.11
  • Papercut Papercut Mf >= 22.0.0 and < 22.0.9
  • Papercut Papercut Ng >= 15.0 and < 20.1.7
  • Papercut Papercut Ng >= 21.0.0 and < 21.2.11
  • Papercut Papercut Ng >= 22.0.0 and < 22.0.9
Patched Versions
  • Papercut Papercut Mf 20.1.7
  • Papercut Papercut Mf 21.2.11
  • Papercut Papercut Mf 22.0.9
  • Papercut Papercut Ng 20.1.7
  • Papercut Papercut Ng 21.2.11
  • Papercut Papercut Ng 22.0.9
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🎁7-Day Free Trial — Try Pro or Team, no card required.
📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
📈EPSS Spike Alerts — Catch rising risk before it peaks.
🎯Custom EPSS/CVSS — Filter noise, focus on risk.
🛡️Exploit Intel — A 2nd confirmed-exploit signal beyond KEV.
🐙GitHub Issues — Auto-tracked, no duplicates.
📬Weekly Digest — One clean summary, not inbox spam.
🏷️Watchlist Groups — Tag alerts by team (Infra/AppSec/SOC).
💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
🚫Ad-Free — Uninterrupted experience.

External References