XSS in Onlyoffice Server
CVE-2021-43446
ONLYOFFICE all versions as of 2021-11-08 is vulnerable to Cross Site Scripting (XSS). The "macros" feature of the document editor allows malicious cross site scripting payloads to be used.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.008 (55.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/ONLYOFFICE/server (Third Party Advisory)
- onlyoffice.com/ (Product, Vendor Advisory)
- labs.nettitude.com/blog/exploiting-onlyoffice-web-sockets-for-unauthenticated-r… (Exploit, Third Party Advisory, Mitigation)
Frequently asked questions
- What is CVE-2021-43446?
- CVE-2021-43446 is a medium-severity vulnerability in Onlyoffice Server, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-01-23.
- How severe is CVE-2021-43446?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2021-43446 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.