Implem Pleasanter up to 1.5.9.0 improper authentication

Summaryinfo

A vulnerability, which was classified as critical, has been found in Implem Pleasanter up to 1.5.9.0. Impacted is an unknown function. This manipulation causes improper authentication. This vulnerability appears as CVE-2026-113438. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability has been found in Implem Pleasanter up to 1.5.9.0 and classified as critical. Affected by this vulnerability is an unknown functionality. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Pleasanter provided fails to properly verify passwords in LDAP authentication when processing specially crafted requests under certain configurations. If exploited, an attacker may bypass LDAP authentication by providing only a valid Login ID, without a password. As a result, an attacker may view, alter or delete information stored in the product with the privilege of the account used to log in.

It is possible to read the advisory at pleasanter.org. This vulnerability is known as CVE-2026-113438 since 10/21/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/26/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Implem

Name

• Pleasanter

Version

• 1.5.0
• 1.5.1
• 1.5.2
• 1.5.3
• 1.5.4
• 1.5.5
• 1.5.6
• 1.5.7
• 1.5.8
• 1.5.9.0

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