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CVE-2023-27351 is an improper authentication vulnerability in PaperCut NG/MF that allows a remote attacker to bypass authentication on affected application servers. The flaw exists in the SecurityRequestFilter class and is caused by improper implementation of the authentication algorithm. Reported affected versions include PaperCut NG 22.0.5 (Build 63914), and broader reporting indicates PaperCut MF/NG version 15.0 or later prior to vendor fixes. The issue can be exploited without prior authentication, enabling unauthorized access to functionality that should be restricted to authenticated users. The vulnerability has been observed in active exploitation and has been associated with follow-on intrusion activity by ransomware operators.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
35 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A PaperCut vulnerability that Microsoft says Storm-1175 has exploited among its set of rapidly weaponized flaws.
An improper authentication vulnerability in PaperCut NG/MF that was widely exploited for unauthenticated server access.
An improper authentication vulnerability in PaperCut NG/MF that allows authentication bypass via the SecurityRequestFilter class.
An improper authentication vulnerability in PaperCut NG/MF that allows authentication bypass via the SecurityRequestFilter class.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.