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Known exploited vulnerability · CISA KEV

CVE-2022-36537: ZK Framework AuUploader Unspecified Vulnerability

ZK Framework AuUploader servlets contain an unspecified vulnerability that could allow an attacker to retrieve the content of a file located in the web context. The ZK Framework is an open-source Java framework. This vulnerability can impact multiple products, including but not limited to ConnectWise R1Soft Server Backup Manager.

CVE-2022-36537

Exploited in the wild. Fix this first.

CISA added it to the Known Exploited Vulnerabilities catalog on 2023-02-27: attackers are using it right now. It is known to be used in ransomware campaigns.

CISA KEV
Listed
Added 2023-02-27 · federal fix-by 2023-03-20
EPSS (30 days)
95%
Higher than 99.9% of CVEs · 2026-11-01
CVSS v3.1
7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

What CISA says

ZK Framework AuUploader Unspecified Vulnerability

Apply updates per vendor instructions.

NVD description · published 2022-08-26

ZK Framework v9.6.1, 9.6.0.1, 9.5.1.3, 9.0.1.2 and 8.6.4.1 allows attackers to access sensitive information via a crafted POST request sent to the component AuUploader.

Full record on NVD

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How to check if you are exposed to CVE-2022-36537

  1. Find every ZK Framework AuUploader system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
  2. Compare each version with the fixed versions in the vendor advisory below. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
  3. Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2022-36537.

US federal agencies had to fix this by 2023-03-20. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Affected versions

Versions the National Vulnerability Database lists as vulnerable to CVE-2022-36537. Check the vendor advisory for the exact fixed builds before you sign anything off.

ProductVulnerable versions
Zkoss ZK Frameworkbefore 8.6.4.2; from 9.0.0 before 9.0.1.3; from 9.5.0 before 9.5.1.3; from 9.6.0 before 9.6.2

Timeline

  1. · Published in the National Vulnerability Database
  2. · Added to CISA's Known Exploited Vulnerabilities catalog, 185 days after it was published
  3. · Fix-by date for US federal agencies, passed 1,322 days ago

Vendor advisories and fixes

Weakness type

Keep going

Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

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