How severe is CVE-2020-26938?

CVE-2020-26938 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-26938 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-26938?

CVE-2020-26938 affects Oauth2-server Project Oauth2-server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-26938?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-26938 published?

CVE-2020-26938 was published on 2022-08-29 and last updated on 2026-06-17.

CVE-2020-26938

CVE-2020-26938 is a high-severity vulnerability in Oauth2-server Project Oauth2-server with a CVSS 3.x base score of 7.2. 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-601.

Key facts

Severity: High (CVSS 3.x base score 7.2)
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-601
Affected product: Oauth2-server Project Oauth2-server
Published: 2022-08-29
Last modified: 2026-06-17

Description

In oauth2-server (aka node-oauth2-server) through 3.1.1, the value of the redirect_uri parameter received during the authorization and token request is checked against an incorrect URI pattern ("[a-zA-Z][a-zA-Z0-9+.-]+:") before making a redirection. This allows a malicious client to pass an XSS payload through the redirect_uri parameter while making an authorization request. NOTE: this vulnerability is similar to CVE-2020-7741.

Frequently asked questions

What is CVE-2020-26938?: In oauth2-server (aka node-oauth2-server) through 3.1.1, the value of the redirect_uri parameter received during the authorization and token request is checked against an incorrect URI pattern ("[a-zA-Z][a-zA-Z0-9+.-]+:") before making a redirection. This allows a malicious client to pass an XSS payload through the redirect_uri parameter while making an authorization request. NOTE: this vulnerability is similar to CVE-2020-7741.
How severe is CVE-2020-26938?: CVE-2020-26938 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-26938 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-26938?: CVE-2020-26938 affects Oauth2-server Project Oauth2-server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-26938?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-26938 published?: CVE-2020-26938 was published on 2022-08-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:oauth2-server_project:oauth2-server:*:*:*:*:*:node.js:*:*

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