Medium CWE-367 CVEs

CVE	Severity	Published▾	Status	Exploitation	Description
CVE-2026-100235	Medium	2026-11-04	No exploit published	No public exploit	Incorrect authorization due to a time-of-check to time-of-use (TOCTOU) race condition in the setACL request handling of Apache ZooKeeper. When a node's ACL is changed via setACL, the pending change is not published to the server's outstanding change record for that node. Any request that is prepared (and authorized) after the setACL is submitted but before it commits is therefore checked against the previous, pre-revocation ACL, yet is applied to the data tree after the ACL change has taken effect. A client that currently holds a permission can use this window to perform operations requiring that permission through and after its revocation — for example, committing writes or deletes after losing write access, or re-granting itself full permissions, which persistently defeats the revocation. In deployments transitioning from the default OPEN_ACL_UNSAFE ACL to a restrictive ACL, any unauthenticated client can exploit this during the transition. This issue affects Apache ZooKeeper up to and including 3.9.6. Users are recommended to upgrade to version 3.8.8 or 3.9.7, which fixes the issue.
CVE-2026-9796	Medium	2026-05-28	No exploit published	No public exploit	A flaw was found in Keycloak. An authenticated administrator with the `manage-clients` role can exploit a Time-of-check to time-of-use (TOCTOU) vulnerability in the name-based admin role checks. This allows the attacker to escalate their privileges to `realm-admin` for all users within the realm, granting them extensive control over the system. The composite role relationship persists even after the attacker's own permissions are revoked and across system reboots.
CVE-2026-22751	Medium	2026-04-21	No exploit published	No public exploit	Vulnerability in Spring Spring Security. Applications that explicitly configure One-Time Token login with JdbcOneTimeTokenService are vulnerable to a Time-of-check Time-of-use (TOCTOU) race condition. This issue affects Spring Security: from 6.4.0 through 6.4.15, from 6.5.0 through 6.5.9, from 7.0.0 through 7.0.4.
CVE-2024-30471	Medium	2024-07-17	No exploit published	No public exploit	Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in Apache StreamPipes in user self-registration. This allows an attacker to potentially request the creation of multiple accounts with the same email address until the email address is registered, creating many identical users and corrupting StreamPipe's user management. This issue affects Apache StreamPipes: through 0.93.0. Users are recommended to upgrade to version 0.95.0, which fixes the issue.
CVE-2021-21615	Medium	2021-01-26	No exploit published	No public exploit	Jenkins 2.275 and LTS 2.263.2 allows reading arbitrary files using the file browser for workspaces and archived artifacts due to a time-of-check to time-of-use (TOCTOU) race condition.

CVE

Severity

Published▾

Status

Exploitation

Description

CVE-2026-100235

Medium

2026-11-04

No exploit published

No public exploit

Incorrect authorization due to a time-of-check to time-of-use (TOCTOU) race condition in the setACL request handling of Apache ZooKeeper. When a node's ACL is changed via setACL, the pending change is not published to the server's outstanding change record for that node. Any request that is prepared (and authorized) after the setACL is submitted but before it commits is therefore checked against the previous, pre-revocation ACL, yet is applied to the data tree after the ACL change has taken effect. A client that currently holds a permission can use this window to perform operations requiring that permission through and after its revocation — for example, committing writes or deletes after losing write access, or re-granting itself full permissions, which persistently defeats the revocation. In deployments transitioning from the default OPEN_ACL_UNSAFE ACL to a restrictive ACL, any unauthenticated client can exploit this during the transition. This issue affects Apache ZooKeeper up to and including 3.9.6. Users are recommended to upgrade to version 3.8.8 or 3.9.7, which fixes the issue.

CVE-2026-9796

Medium

2026-05-28

No exploit published

No public exploit

A flaw was found in Keycloak. An authenticated administrator with the `manage-clients` role can exploit a Time-of-check to time-of-use (TOCTOU) vulnerability in the name-based admin role checks. This allows the attacker to escalate their privileges to `realm-admin` for all users within the realm, granting them extensive control over the system. The composite role relationship persists even after the attacker's own permissions are revoked and across system reboots.

CVE-2026-22751

Medium

2026-04-21

No exploit published

No public exploit

Vulnerability in Spring Spring Security. Applications that explicitly configure One-Time Token login with JdbcOneTimeTokenService are vulnerable to a Time-of-check Time-of-use (TOCTOU) race condition. This issue affects Spring Security: from 6.4.0 through 6.4.15, from 6.5.0 through 6.5.9, from 7.0.0 through 7.0.4.

CVE-2024-30471

Medium

2024-07-17

No exploit published

No public exploit

Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in Apache StreamPipes in user self-registration. This allows an attacker to potentially request the creation of multiple accounts with the same email address until the email address is registered, creating many identical users and corrupting StreamPipe's user management. This issue affects Apache StreamPipes: through 0.93.0. Users are recommended to upgrade to version 0.95.0, which fixes the issue.

CVE-2021-21615

Medium

2021-01-26

No exploit published

No public exploit

Jenkins 2.275 and LTS 2.263.2 allows reading arbitrary files using the file browser for workspaces and archived artifacts due to a time-of-check to time-of-use (TOCTOU) race condition.