CVE-2025-13736: When Multi-Attribute Login is enabled, the login interface fails to consistently mask the existence of user ac

Routine

LOW 3.7REMOTEUPGRADEUPGRADEUPGRADE

CVE-2025-13736 is a low-severity flaw (CVSS 3.7) affecting api manager, identity server, identity server as key manager. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

When Multi-Attribute Login is enabled, the login interface fails to consistently mask the existence of user accounts. For valid users, the server resolves and displays their canonical username, while for non-existent users, it echoes the original input. This occurs regardless of the validate_username configuration. The discovery of valid usernames can increase the risk of brute force attacks, social engineering attacks, and targeted information

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	3.7 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-203
Published	2026-08-06
Last modified	2026-09-29

Publisher (CNA): WSO2 LLC · Vendor: wso2

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

Am I affected?

Timeline

2026-08-06 08:16 UTCPublished CVE record published
2026-09-29 14:10 UTCUpdated Record last modified

wso2 api manager UPGRADE

Affected: >= 3.1.0 and < 3.1.0.351 · >= 3.2.0 and < 3.2.0.455 · >= 4.0.0 and < 4.0.0.375

Fixed in: 3.1.0.351, 3.2.0.455, 4.0.0.375

Safe to downgrade to: a release before 3.1.0

1. Check installed version

apt-cache policy api-manager || rpm -q api-manager || api-manager --version

2. UPGRADE to 3.1.0.351 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade api-manager

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade api-manager

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 3.1.0 (Debian / Ubuntu)

apt-cache madison api-manager sudo apt install api-manager=<VERSION_BEFORE_3.1.0> sudo apt-mark hold api-manager

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

dnf --showduplicates list api-manager sudo dnf downgrade api-manager-<VERSION_BEFORE_3.1.0> sudo dnf versionlock add api-manager

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.

wso2 identity server UPGRADE

Affected: >= 5.10.0 and < 5.10.0.380 · >= 5.11.0 and < 5.11.0.427 · >= 6.0.0 and < 6.0.0.254 · >= 6.1.0 and < 6.1.0.255 · >= 7.0.0 and < 7.0.0.132 · >= 7.1.0 and < 7.1.0.40 · >= 7.2.0 and < 7.2.0.2

Fixed in: 5.10.0.380, 5.11.0.427, 6.0.0.254, 6.1.0.255, 7.0.0.132, 7.1.0.40, 7.2.0.2

Safe to downgrade to: a release before 5.10.0

1. Check installed version

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

2. UPGRADE to 5.10.0.380 (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 5.10.0 (Debian / Ubuntu)

apt-cache madison identity-server sudo apt install identity-server=<VERSION_BEFORE_5.10.0> 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_5.10.0> 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.

wso2 identity server as key manager UPGRADE

Affected: >= 5.10.0 and < 5.10.0.371

Fixed in: 5.10.0.371

Safe to downgrade to: a release before 5.10.0

1. Check installed version

apt-cache policy identity-server-as-key-manager || rpm -q identity-server-as-key-manager || identity-server-as-key-manager --version

2. UPGRADE to 5.10.0.371 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade identity-server-as-key-manager

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade identity-server-as-key-manager

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 5.10.0 (Debian / Ubuntu)

apt-cache madison identity-server-as-key-manager sudo apt install identity-server-as-key-manager=<VERSION_BEFORE_5.10.0> sudo apt-mark hold identity-server-as-key-manager

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

dnf --showduplicates list identity-server-as-key-manager sudo dnf downgrade identity-server-as-key-manager-<VERSION_BEFORE_5.10.0> sudo dnf versionlock add identity-server-as-key-manager

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.

wso2 open banking am UPGRADE

Affected: >= 2.0.0 and < 2.0.0.400

Fixed in: 2.0.0.400

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy open-banking-am || rpm -q open-banking-am || open-banking-am --version

2. UPGRADE to 2.0.0.400 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade open-banking-am

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade open-banking-am

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 2.0.0 (Debian / Ubuntu)

apt-cache madison open-banking-am sudo apt install open-banking-am=<VERSION_BEFORE_2.0.0> sudo apt-mark hold open-banking-am

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

dnf --showduplicates list open-banking-am sudo dnf downgrade open-banking-am-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add open-banking-am

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.

wso2 open banking iam UPGRADE

Affected: >= 2.0.0 and < 2.0.0.420

Fixed in: 2.0.0.420

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy open-banking-iam || rpm -q open-banking-iam || open-banking-iam --version

2. UPGRADE to 2.0.0.420 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade open-banking-iam

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade open-banking-iam

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 2.0.0 (Debian / Ubuntu)

apt-cache madison open-banking-iam sudo apt install open-banking-iam=<VERSION_BEFORE_2.0.0> sudo apt-mark hold open-banking-iam

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

dnf --showduplicates list open-banking-iam sudo dnf downgrade open-banking-iam-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add open-banking-iam

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-2025-13736?

api manager: upgrade to 3.1.0.351, 3.2.0.455, 4.0.0.375; identity server: upgrade to 5.10.0.380, 5.11.0.427, 6.0.0.254, 6.1.0.255, 7.0.0.132, 7.1.0.40, 7.2.0.2; identity server as key manager: upgrade to 5.10.0.371. Exact commands for each OS are on this page.

Is CVE-2025-13736 being exploited?

CVE-2025-13736 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-2025-13736 affect?

CVE-2025-13736 affects api manager, identity server, identity server as key manager. Severity is low (CVSS 3.7). When Multi-Attribute Login is enabled, the login interface fails to consistently mask the existence of user accounts. For valid users, the server resolves and displays their canonical username, while for non-existent users, it echoes the or

How urgent is CVE-2025-13736?

Priority 23/100. Remotely exploitable, no login, no user action

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References

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