CVE-2026-110971 in Płatnik
Summary
by MITRE • 10/30/2026
Use of a weak password encoding algorithm in Płatnik software allows a user who obtains encoded password to easily decode it.
This issue was fixed in metric 242 in version 10.02.002.
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Analysis
by VulDB Data Team • 10/30/2026
The vulnerability identified within the Płatnik software, specifically addressed in update metric 242 for version 10.02.002, stems from the implementation of a weak password encoding algorithm. This flaw represents a fundamental failure in cryptographic design where the method used to protect user credentials lacks sufficient computational complexity or entropy resistance. In modern security architectures, passwords must be protected using robust hashing algorithms such as bcrypt, scrypt, Argon2, or PBKDF2 with appropriate salt and iteration counts. The use of weak encoding, which often implies simple reversible encryption like Base64 or outdated hash functions without salting, means that the stored credentials do not provide meaningful security against offline attacks. When an attacker gains access to the database or storage medium containing these encoded passwords, they can apply readily available decoding tools and techniques to reverse the process with minimal effort. This effectively renders the authentication mechanism obsolete, as the confidentiality of user identities is compromised without requiring any interaction with the live application system.
From a technical perspective, this vulnerability aligns closely with CWE-759: Use of a One-Way Hash without a Salt and CWE-328: Use of Weak Hash. The core issue lies in the lack of salting, which prevents attackers from using precomputed rainbow tables to quickly reverse hash values. Furthermore, if the algorithm is reversible rather than truly one-way, it falls under CWE-760: Use of Reversible Encryption Algorithm for Password Storage. In such scenarios, the encoded string serves merely as obfuscation rather than true security. An adversary who obtains these encoded strings can decode them instantly to reveal plaintext passwords. This exposes not only the specific user accounts associated with those credentials but potentially other systems if users practice password reuse, a common behavior that amplifies the blast radius of such credential exposure incidents significantly beyond the immediate application scope.
The operational impact of this vulnerability is severe regarding data integrity and confidentiality principles defined in standard security frameworks. Under the MITRE ATT&CK framework, this flaw facilitates Credential Access techniques, specifically T1078: Valid Accounts or more broadly contributing to the initial compromise phase by allowing attackers to pivot using stolen credentials. Once decoded, these passwords can be used for unauthorized access to sensitive financial data processed by Płatnik software, which is widely used in Poland for tax and social security reporting. The exposure of such data violates regulatory compliance requirements including GDPR due to the leakage of personally identifiable information and professional secrets. Additionally, it undermines trust in the software provider and exposes organizations relying on this platform to potential fraud, identity theft, and unauthorized transactions that rely on verified user identities within the system.
To mitigate this risk effectively, immediate remediation involves upgrading to version 10.02.002 or later where metric 242 has been applied. This update presumably replaces the weak encoding mechanism with a standards-compliant password hashing algorithm such as Argon2id or bcrypt. Administrators should ensure that all instances of Płatnik are updated and verify that no legacy data remains stored using the deprecated method, which may require a forced password reset for existing users to generate new secure hashes upon next login. Beyond software updates, organizations must enforce strong password policies requiring high entropy and complexity to reduce the success rate of brute-force attacks even if future vulnerabilities arise. Regular security audits should include reviews of authentication mechanisms against current industry standards like NIST SP 800-63B guidelines for digital identity management. Continuous monitoring for unauthorized access attempts using known compromised credentials from external breach databases can also help detect exploitation early, although the primary defense remains eliminating weak cryptographic practices at the source through proper software development lifecycle security controls.