What’s Vulnerable › Vulnerabilities
CVE-2026-8794: PaperCut NG/MF: User enumeration via timing attack
- Severity: medium (CVSS 6.9 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.7% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-03 · updated 2026-10-23
- Weakness: CWE-208
Description
PaperCut NG/MF contains an observable timing discrepancy in its authentication component. An unauthenticated remote attacker can exploit this vulnerability to perform username enumeration by measuring response times during login attempts. The system executes a password hash comparison only when a valid account is supplied, creating a measurable timing oracle that reveals account existence.
Affected products
- PaperCut NG/MF: before 26.0.3 — fixed in 26.0.3
How to fix
Upgrade to a fixed version: PaperCut NG/MF 26.0.3. Check the vendor advisory for mitigations.
References
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