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CVE-2025-13909: The system accepts authentication requests without sufficient validation to enforce tenant isolation when usin

22
Routine
MEDIUM 4.3UPGRADE

CVE-2025-13909 is a medium-severity flaw (CVSS 4.3) affecting identity server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The system accepts authentication requests without sufficient validation to enforce tenant isolation when using Email OTP, SMS OTP, or Magic Link as first-factor authenticators. This failure to adequately separate user data between tenants can lead to the exposure of personally identifiable information. Successful exploitation allows an attacker to disclose personally identifiable information of users in different tenants, resulting in privacy v

Why this priority

  • No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score4.3 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance0.3% (top 72%)
CISA exploited listNo
WeaknessCWE-20, CWE-200
Published2026-08-06
Last modified2026-09-29
Publisher (CNA): WSO2 LLC · Vendor: wso2

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Last updated 2026-09-29 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

wso2 identity server UPGRADE
Affected: >= 7.0.0 and < 7.0.0.134 · >= 7.1.0 and < 7.1.0.42
Fixed in: 7.0.0.134, 7.1.0.42
Safe to downgrade to: a release before 7.0.0
1. Check installed version
apt-cache policy identity-server || rpm -q identity-server || identity-server --version
2. UPGRADE to 7.0.0.134 (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 7.0.0 (Debian / Ubuntu)
apt-cache madison identity-server sudo apt install identity-server=<VERSION_BEFORE_7.0.0> 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_7.0.0> 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-2025-13909?

identity server: upgrade to 7.0.0.134, 7.1.0.42. Exact commands for each OS are on this page.

Is CVE-2025-13909 being exploited?

CVE-2025-13909 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-2025-13909 affect?

CVE-2025-13909 affects identity server. Severity is medium (CVSS 4.3). The system accepts authentication requests without sufficient validation to enforce tenant isolation when using Email OTP, SMS OTP, or Magic Link as first-factor authenticators. This failure to adequately separate user data between tenants

How urgent is CVE-2025-13909?

Priority 22/100. No elevated risk signals yet.

Related CVEs

References

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