CVE-2025-49253 is a high-severity vulnerability classified under CWE-98, which pertains to improper control of filenames used in include or require statements within PHP applications. Specifically, this vulnerability affects the thembay Lasa product, versions up to and including 1.1. The flaw allows for PHP Local File Inclusion (LFI), where an attacker can manipulate the filename parameter in an include or require statement to execute arbitrary local files on the server. This can lead to the execution of malicious code, disclosure of sensitive information, or complete compromise of the affected system. The vulnerability is remotely exploitable over the network without requiring authentication or user interaction, as indicated by the CVSS vector (AV:N/AC:H/PR:N/UI:N). However, the attack complexity is high, meaning exploitation requires specific conditions or knowledge about the target environment. The impact on confidentiality, integrity, and availability is high, as successful exploitation can lead to full system compromise. No known public exploits have been reported yet, and no patches are currently available. The vulnerability was published on June 17, 2025, and was reserved on June 4, 2025. The lack of patch availability increases the urgency for organizations using thembay Lasa to implement mitigations to reduce exposure.

For European organizations, the impact of CVE-2025-49253 can be significant, especially for those relying on the thembay Lasa PHP product in their web infrastructure. Exploitation could lead to unauthorized access to internal files, leakage of sensitive corporate or customer data, and potential full server compromise. This could disrupt business operations, damage reputation, and lead to regulatory penalties under GDPR due to data breaches. Organizations in sectors such as e-commerce, finance, healthcare, and government, which often use PHP-based web applications, are particularly at risk. The high severity and remote exploitability without authentication make it a critical concern for public-facing web servers. Additionally, the high attack complexity suggests that while exploitation is not trivial, skilled attackers or targeted campaigns could succeed, especially if combined with other vulnerabilities or misconfigurations. The absence of known exploits in the wild currently provides a window for proactive defense, but the situation could evolve rapidly once exploit code becomes available.

Given the absence of an official patch, European organizations should adopt a multi-layered mitigation strategy: 1) Conduct an immediate audit to identify all instances of thembay Lasa version 1.1 or earlier in their environment. 2) Restrict web server permissions to limit PHP's ability to read or execute files outside designated directories, using techniques such as open_basedir restrictions and disabling allow_url_include in php.ini. 3) Employ Web Application Firewalls (WAFs) with custom rules to detect and block suspicious include/require parameter manipulations indicative of LFI attempts. 4) Implement strict input validation and sanitization on all user-supplied parameters related to file inclusion, ideally by whitelisting allowed filenames or paths. 5) Monitor logs for anomalous file access patterns or errors related to include/require statements. 6) Isolate vulnerable applications in segmented network zones to limit lateral movement if compromised. 7) Prepare incident response plans specifically addressing LFI exploitation scenarios. 8) Engage with the vendor thembay for updates and patches, and plan for prompt application of any future fixes. 9) Consider temporary removal or replacement of the vulnerable component if feasible until a patch is available.