CVE-2025-10503: The authentication endpoint accepts user-supplied input without enforcing expected validation constraints, lea

Routine

MEDIUM 6.1UPGRADE

CVE-2025-10503 is a medium-severity flaw (CVSS 6.1) affecting identity server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 ot

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-29
Last modified	2026-10-07

Publisher (CNA): WSO2 LLC · Vendor: wso2

Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-29 09:16 UTCPublished CVE record published
2026-10-07 09:10 UTCUpdated Record last modified

wso2 identity server UPGRADE

Affected: >= 7.1.0 and < 7.1.0.28

Fixed in: 7.1.0.28

Safe to downgrade to: a release before 7.1.0

1. Check installed version

apt-cache policy identity-server || rpm -q identity-server || identity-server --version

2. UPGRADE to 7.1.0.28 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade identity-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade identity-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 7.1.0 (Debian / Ubuntu)

apt-cache madison identity-server sudo apt install identity-server=<VERSION_BEFORE_7.1.0> sudo apt-mark hold identity-server

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list identity-server sudo dnf downgrade identity-server-<VERSION_BEFORE_7.1.0> sudo dnf versionlock add identity-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-10503?

identity server: upgrade to 7.1.0.28. Exact commands for each OS are on this page.

Is CVE-2025-10503 being exploited?

CVE-2025-10503 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-10503 affect?

CVE-2025-10503 affects identity server. Severity is medium (CVSS 6.1). 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

How urgent is CVE-2025-10503?

Priority 23/100. No elevated risk signals yet.

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References

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