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CVE-2024-0391: The check user account lock states feature within the email OTP flow fails to validate user input, allowing an

26
Routine
MEDIUM 5.3REMOTEUPGRADEUPGRADEUPGRADE

CVE-2024-0391 is a medium-severity flaw (CVSS 5.3) affecting identity server, identity server as key manager, open banking iam. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The check user account lock states feature within the email OTP flow fails to validate user input, allowing an attacker to infer the existence of registered user accounts. The discovery of valid usernames can increase the risk of brute-force and social engineering attacks. Attackers can leverage this information to craft targeted phishing campaigns or other malicious activities aimed at tricking users into divulging sensitive data, potentially d

Why this priority

  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score5.3 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.2% (top 92%)
CISA exploited listNo
WeaknessCWE-204
Published2026-05-11
Last modified2026-06-17
Publisher (CNA): WSO2 LLC · Vendor: wso2

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Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

wso2 identity server UPGRADE
Affected: >= 5.10.0 and < 5.10.0.379 · >= 5.11.0 and < 5.11.0.426 · >= 6.0.0 and < 6.0.0.253 · >= 6.1.0 and < 6.1.0.254 · >= 7.0.0 and < 7.0.0.131
Fixed in: 5.10.0.379, 5.11.0.426, 6.0.0.253, 6.1.0.254, 7.0.0.131
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 5.10.0.379 (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 < 5.10.267
Fixed in: 5.10.267
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 5.10.267 (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 iam UPGRADE
Affected: >= 2.0.0 and < 2.0.0.318
Fixed in: 2.0.0.318
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 2.0.0.318 (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-2024-0391?

identity server: upgrade to 5.10.0.379, 5.11.0.426, 6.0.0.253, 6.1.0.254, 7.0.0.131; identity server as key manager: upgrade to 5.10.267; open banking iam: upgrade to 2.0.0.318. Exact commands for each OS are on this page.

Is CVE-2024-0391 being exploited?

CVE-2024-0391 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-2024-0391 affect?

CVE-2024-0391 affects identity server, identity server as key manager, open banking iam. Severity is medium (CVSS 5.3). The check user account lock states feature within the email OTP flow fails to validate user input, allowing an attacker to infer the existence of registered user accounts. The discovery of valid usernames can increase the risk of brute-for

How urgent is CVE-2024-0391?

Priority 26/100. Remotely exploitable, no login, no user action

Related CVEs

References

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