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Vulnerability record · CVE-2021-3830 · published 26 September 2021

CVE-2021-3830: Btcpayserver btcpay server cross-site scripting vulnerability

Btcpayserver · Btcpay Server

btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

5.4 CVSS 3.1 Medium EPSS 0.56% · top 55.6% CWE-79 · Cross-site scripting
5.4CVSS 3.1 base score, v2 3.5
0.56%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/btcpayserver/btcpayserver/commit/fc4e47cec608cc3dba24b19d0145ac69320b975e PatchThird Party Advisory
https://huntr.dev/bounties/0fcdee5f-1f07-47ce-b650-ea8b4a7d35d8 ExploitIssue TrackingPatchThird Party Advisory
https://github.com/btcpayserver/btcpayserver/commit/fc4e47cec608cc3dba24b19d0145ac69320b975e PatchThird Party Advisory
https://huntr.dev/bounties/0fcdee5f-1f07-47ce-b650-ea8b4a7d35d8 ExploitIssue TrackingPatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2023-0493Btcpayserver btcpay server injection vulnerabilityImproper Neutralization of Equivalent Special Elements in GitHub repository btcpayserver/btcpayserver prior to 1.7.5.EPSS 7.9%7.5CVE-2022-32984Btcpayserver btcpay server information exposure vulnerabilityBTCPay Server 1.3.0 through 1.5.3 allows a remote attacker to obtain sensitive information when a public Point of Sale app is exposed. The sensitive …EPSS 1.0%7.5CVE-2021-29249Btcpayserver btcpay server vulnerabilityBTCPay Server before 1.0.6.0, when the payment button is used, has a privacy vulnerability.EPSS 1.2%6.7CVE-2021-29246Btcpayserver btcpay server path traversal vulnerabilityBTCPay Server through 1.0.7.0 suffers from directory traversal, which allows an attacker with admin privileges to achieve code execution. The attacke…EPSS 1.5%6.5CVE-2021-29251Btcpayserver btcpay server vulnerabilityBTCPay Server before 1.0.7.1 mishandles the policy setting in which users can register (in Server Settings > Policies). This affects Docker use cases…EPSS 0.79%6.1CVE-2021-3646Btcpayserver btcpay server cross-site scripting vulnerabilitybtcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')EPSS 0.77%5.4CVE-2023-1149Btcpayserver btcpay server vulnerabilityImproper Neutralization of Equivalent Special Elements in GitHub repository btcpayserver/btcpayserver prior to 1.8.0.EPSS 0.55%5.4CVE-2023-0879Btcpayserver btcpay server cross-site scripting vulnerabilityCross-site Scripting (XSS) - Stored in GitHub repository btcpayserver/btcpayserver prior to 1.7.12.EPSS 0.48%

Source: NIST National Vulnerability Database (record CVE-2021-3830), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.