How severe is CVE-2025-10503?

CVE-2025-10503 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-10503 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-10503?

CVE-2025-10503 affects Wso2 Identity Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-10503?

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

Does CVE-2025-10503 have an EU (EUVD) identifier?

Yes. CVE-2025-10503 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-209586.

When was CVE-2025-10503 published?

CVE-2025-10503 was published on 2026-04-29 and last updated on 2026-10-07.

CVE-2025-10503

CVE-2025-10503 is a medium-severity vulnerability in Wso2 Identity Server with a CVSS 3.x base score of 6.1. 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 6.1)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-209586
Weakness: CWE-79
Affected product: Wso2 Identity Server
Published: 2026-04-29
Last modified: 2026-10-07

Description

The authentication endpoint accepts user-supplied input without enforcing expected validation constraints, leading to a lack of proper output encoding. This allows for the injection of malicious JavaScript payloads, enabling reflected cross-site scripting. An attacker can leverage this vulnerability to redirect the user's browser to a malicious website, modify the user interface of the web page, retrieve information from the browser, or cause other harmful actions. However, due to the protection of session-related cookies with the httpOnly flag, session hijacking is not possible.

Frequently asked questions

What is CVE-2025-10503?: The authentication endpoint accepts user-supplied input without enforcing expected validation constraints, leading to a lack of proper output encoding. This allows for the injection of malicious JavaScript payloads, enabling reflected cross-site scripting. An attacker can leverage this vulnerability to redirect the user's browser to a malicious website, modify the user interface of the web page, retrieve information from the browser, or cause other harmful actions. However, due to the protection of session-related cookies with the httpOnly flag, session hijacking is not possible.
How severe is CVE-2025-10503?: CVE-2025-10503 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-10503 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-10503?: CVE-2025-10503 affects Wso2 Identity Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-10503?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-10503 have an EU (EUVD) identifier?: Yes. CVE-2025-10503 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-209586.
When was CVE-2025-10503 published?: CVE-2025-10503 was published on 2026-04-29 and last updated on 2026-10-07.

References

https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4577/

Affected products (1)

cpe:2.3:a:wso2:identity_server:*:*:*:*:*:*:*:*

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