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PatchSiren cyber security CVE debrief

CVE-2023-2533 PaperCut CVE debrief

CVE-2023-2533 is a PaperCut NG/MF cross-site request forgery (CSRF) vulnerability that CISA has added to its Known Exploited Vulnerabilities catalog. For defenders, the key signal is not just the vulnerability class but the fact that it is treated as known-exploited by CISA, with a remediation due date of 2025-08-18 in the supplied record. Organizations running PaperCut NG/MF should treat this as a priority item, verify whether any affected instances are in use, and follow official vendor and CISA guidance without delay.

Vendor
PaperCut
Product
NG/MF
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2025-07-28
Original CVE updated
2025-07-28
Advisory published
2025-07-28
Advisory updated
2025-07-28

Who should care

Administrators and security teams responsible for PaperCut NG/MF deployments, especially organizations that expose the product to internal users, remote access, or managed/cloud environments; MSPs and resellers supporting customer print infrastructure should also review their fleets.

Technical summary

The supplied source corpus identifies the issue as a CSRF vulnerability in PaperCut NG/MF. CISA’s KEV entry classifies it as a known exploited vulnerability and directs affected parties to apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services where relevant, or discontinue use of the product if mitigations are unavailable. The corpus does not include exploit mechanics, CVSS scoring, or the full vendor advisory text, so the most reliable technical conclusion here is that this is a high-priority authentication/state-changing request integrity issue in a product with confirmed exploitation concern.

Defensive priority

High. CISA KEV inclusion indicates active defender urgency, and the supplied record includes a near-term remediation due date. Prioritize inventory, mitigation, and validation of PaperCut NG/MF exposure immediately.

Recommended defensive actions

  • Inventory all PaperCut NG/MF instances and confirm version, deployment model, and administrative exposure.
  • Review the official PaperCut security bulletin and NVD entry referenced by the KEV record for vendor-specific remediation guidance.
  • Apply vendor-recommended mitigations or updates as soon as possible.
  • If mitigations are unavailable, follow CISA guidance and discontinue use of the product or isolate it until a safe remediation path exists.
  • For cloud-managed or service-like deployments, assess applicability of BOD 22-01 guidance as referenced by CISA.
  • Validate that administrative workflows, access controls, and request protections are functioning as intended after remediation.
  • Review relevant logs and configuration changes for unexpected administrative or state-changing activity around the exposure window.

Evidence notes

CISA’s KEV source lists CVE-2023-2533 as “PaperCut NG/MF Cross-Site Request Forgery (CSRF) Vulnerability,” with dateAdded 2025-07-28 and dueDate 2025-08-18 in the supplied record. The KEV metadata also states the required action is to apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. The supplied notes reference the PaperCut June 2023 security bulletin and the NVD detail page, but the bulletin text itself is not included in the corpus here.

Official resources

Public vulnerability disclosure is reflected in the official CVE and CISA KEV records supplied here. CISA lists the issue as known exploited and sets a remediation due date of 2025-08-18 in the supplied timeline.