How severe is CVE-2021-29250?

CVE-2021-29250 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-29250 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-29250?

CVE-2021-29250 affects Btcpayserver Btcpay Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-29250?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-29250 published?

CVE-2021-29250 was published on 2021-05-05 and last updated on 2026-06-17.

CVE-2021-29250

CVE-2021-29250 is a medium-severity vulnerability in Btcpayserver Btcpay Server with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Btcpayserver Btcpay Server
Published: 2021-05-05
Last modified: 2026-06-17

Description

BTCPay Server through 1.0.7.0 suffers from a Stored Cross Site Scripting (XSS) vulnerability within the POS Add Products functionality. This enables cookie stealing.

Frequently asked questions

What is CVE-2021-29250?: BTCPay Server through 1.0.7.0 suffers from a Stored Cross Site Scripting (XSS) vulnerability within the POS Add Products functionality. This enables cookie stealing.
How severe is CVE-2021-29250?: CVE-2021-29250 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-29250 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-29250?: CVE-2021-29250 affects Btcpayserver Btcpay Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-29250?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-29250 published?: CVE-2021-29250 was published on 2021-05-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:btcpayserver:btcpay_server:*:*:*:*:*:*:*:*

More vulnerabilities in Btcpayserver Btcpay Server

CVE-2022-32984 — High (CVSS 7.5): BTCPay Server 1.3.0 through 1.5.3 allows a remote attacker to obtain sensitive information when a public Point of Sale…
CVE-2021-29249 — High (CVSS 7.5): BTCPay Server before 1.0.6.0, when the payment button is used, has a privacy vulnerability.
CVE-2021-29246 — Medium (CVSS 6.7): BTCPay Server through 1.0.7.0 suffers from directory traversal, which allows an attacker with admin privileges to…
CVE-2021-29251 — Medium (CVSS 6.5): BTCPay Server before 1.0.7.1 mishandles the policy setting in which users can register (in Server Settings > Policies).…
CVE-2023-0879 — Medium (CVSS 6.3): Cross-site Scripting (XSS) - Stored in GitHub repository btcpayserver/btcpayserver prior to 1.7.12.
CVE-2021-3646 — Medium (CVSS 6.1): btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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