High severity · published Jan 21, 2026
CVE-2021-47855
Openlitespeed 1.7.9 - 'Notes' Stored Cross-Site Scripting
7.2
CVSS
0.3%
EPSS
No
On KEV
Description
Openlitespeed 1.7.9 contains a stored cross-site scripting vulnerability in the dashboard's Notes parameter that allows administrators to inject malicious scripts. Attackers can craft a payload in the Notes field during listener configuration that will execute when an administrator clicks on the Default Icon.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
OpenLiteSpeed · LiteSpeed Technologies
1.7.9 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-47855
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-47855
openlitespeed.org
https://openlitespeed.org/
www.exploit-db.com
https://www.exploit-db.com/exploits/49727
www.vulncheck.com
https://www.vulncheck.com/advisories/openlitespeed-notes-stored-cross-site-scripting
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