PaperCut vulnerabilities in CISA KEV
PaperCut has 5 vulnerabilities in CISA's catalogue of flaws known to be exploited, the 51st highest of any vendor. 3 were added in the last 12 months; 2 are linked to known ransomware use (40% of its entries, against 20.4% across the catalogue). CISA's median fix window for these entries is 14 days (range 14 to 21), against 21 days (range 1 to 184) across the whole catalogue. The most exploited product is NG/MF, with 4 entries. Other frequently affected products: MF/NG (1).
Catalog v2026.11.04, released 5 Nov 2026. Source CISA ↗. All KEV entries.
$ ./kev --vendor papercut --summary
Counts are computed from the catalog release on ; the 12 month window ends there.
┌─ total entries
5
in CISA KEV
┌─ first added
2023-04-21
earliest entry
┌─ latest added
2026-08-31
most recent entry
┌─ last 12 months
3
entries added
┌─ ransomware use
2 of 5
40% linked to ransomware
┌─ distinct products
2
affected products
$ awk -F, {print $1} /var/log/kev/papercut.log | uniq -c
Entries by the year CISA added them.
| Year | Entries added | Of which ransomware |
|---|---|---|
| 2023 | 1 | 1 |
| 2025 | 1 | 0 |
| 2026 | 3 | 1 |
$ sort /var/log/kev/papercut.log | uniq -c | sort -rn | head -5
The five products with the most entries in the catalogue.
- NG/MF 4 entries
- MF/NG 1 entry
$ kev-due-dates --vendor papercut
Days between the date CISA added an entry and the due date it set, median and range. Due dates apply to US federal agencies; for everyone else they are a patch-first ranking signal.
┌─ PaperCut
14 days (range 14 to 21)
median and range in days
┌─ whole catalogue
21 days (range 1 to 184)
median and range in days
$ grep -o 'CWE-[0-9]*' /var/log/kev/papercut.log | sort | uniq -c | sort -rn | head -3
Weakness types CISA records for these entries (5 of 5 have at least one CWE).
$ grep -ril 'PaperCut' /var/log/news | head -5
Our reporting that names PaperCut or one of its KEV CVE ids, newest first.
┌─ /var/log/news
Patch Week pages with these entries
$ wc -l ./papercut.kev · 5 rows
Descriptions: CISA Known Exploited Vulnerabilities catalogue
- CVE-2026-81578
NG/MF
PaperCut NG/MF Missing Authentication for Critical Function Vulnerability
due 2026-09-14 · CWE-306
$ cat CVE-2026-81578.txt
Description. PaperCut NG/MF contains a missing authentication for critical function vulnerability which allows an unauthenticated remote attacker to modify certain system configurations. This vulnerability can be chained with CVE-2026-82078.
Required action. Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
- CVE-2026-82078
NG/MF
PaperCut NG/MF Unsafe Reflection Vulnerability
due 2026-09-14 · CWE-470
$ cat CVE-2026-82078.txt
Description. PaperCut NG/MF contains an unsafe reflection vulnerability that allows an attacker to manipulate system configuration parameters and execute arbitrary Java bytecode residing on the application classpath under the security context of the PaperCut server process. This vulnerability can be chained with CVE-2026-81578.
Required action. Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
- CVE-2023-27351
NG/MF [RANSOMWARE]
PaperCut NG/MF Improper Authentication Vulnerability
due 2026-05-04 · CWE-287
$ cat CVE-2023-27351.txt
Description. PaperCut NG/MF contains an improper authentication vulnerability that could allow remote attackers to bypass authentication on affected installations via the SecurityRequestFilter class.
Required action. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CVE-2023-2533
NG/MF
PaperCut NG/MF Cross-Site Request Forgery (CSRF) Vulnerability
due 2025-08-18 · CWE-352
$ cat CVE-2023-2533.txt
Description. PaperCut NG/MF contains a cross-site request forgery (CSRF) vulnerability, which, under specific conditions, could potentially enable an attacker to alter security settings or execute arbitrary code.
Required action. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CVE-2023-27350
MF/NG [RANSOMWARE]
PaperCut MF/NG Improper Access Control Vulnerability
due 2023-05-12 · CWE-284
$ cat CVE-2023-27350.txt
Description. PaperCut MF/NG contains an improper access control vulnerability within the SetupCompleted class that allows authentication bypass and code execution in the context of system.
Required action. Apply updates per vendor instructions.