PaperCut zero-days actively exploited for RCE
ANSSI warns actively exploited PaperCut MF/NG vulnerabilities allow authentication bypass and remote code execution; patches urgently recommended.
Sourcecert.ssi.gouv.fr — open the original
What to check
- Applies to
- The 2 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- CISA lists CVE-2026-81578 and CVE-2026-82078 as exploited in the wild.
CERT-FR has issued an advisory covering multiple vulnerabilities in PaperCut MF and NG print management software, affecting all versions prior to 24, 25, or 26 without the vendor's temporary security patch. The flaws allow an attacker to bypass authentication and execute arbitrary code remotely. PaperCut has confirmed these vulnerabilities are being actively exploited in the wild, prompting an urgent security bulletin from the vendor on 27 August 2026 and corroborating research from Rapid7.
The vulnerabilities, tracked as CVE-2026-81578 and CVE-2026-82078, relate to SQL query handling for Card/ID number lookups against external databases; the vendor's patch blocks queries containing EXEC, EXECUTE, or CALL statements. CERT-FR strongly recommends applying vendor patches immediately. As an interim mitigation, PaperCut recommends restricting access to the application server to trusted IP addresses via firewall rules.
Defenders should monitor security tooling for anomalous activity involving pc-app.exe, check for missing, truncated, or deleted server.log files, and search logs for the error patterns 'ERROR No suitable driver found for jdbc:no:x' and 'ERROR DatabaseUtils - Database error looking up cardID: VALUES CAST'. PaperCut notes that the absence of these indicators does not confirm the vulnerabilities were not exploited, so organizations should not rely solely on log review to rule out compromise.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1095
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