Medium severity · published Sep 10, 2021
CVE-2021-3646
Cross-site Scripting (XSS) - Reflected in btcpayserver/btcpayserver
6.1
CVSS
0.8%
EPSS
No
On KEV
Description
btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 56% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BT
btcpayserver/btcpayserver · btcpayserver
before 1.2.3 · source: vendor
BS
Btcpay Server · Btcpayserver
before 1.2.3 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3646
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-3646
Patch
https://github.com/btcpayserver/btcpayserver/commit/fc4e47cec608cc3dba24b19d0145ac69320b975e
Exploit
https://huntr.dev/bounties/32e30ecf-31fa-45f6-8552-47250ef0e613
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