CVE-2026-1813
Published: 04 February 2026
Summary
CVE-2026-1813 is a medium-severity Improper Access Control (CWE-284) vulnerability in Adlered Bolo-Solo. Its CVSS base score is 6.3 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Web Shell (T1505.003); ranked at the 6.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
This control enforces ownership-based restrictions on portable storage device use, directly implementing access control over media insertion into organizational systems.
Hardware write-protect enforces access control on critical resources (e.g., firmware) independent of software state.
The access control policy and procedures directly mandate and enforce proper access control mechanisms across the organization.
Device lock enforces restricted access until re-authentication, directly reducing unauthorized use of active sessions.
Supervision and review of access control activities directly detects and remediates improper access configurations or usages.
Explicitly identifying and documenting actions permitted without identification or authentication enforces proper access control boundaries by defining justified exceptions.
By automatically labeling outputs with security attributes, the control supports attribute-based enforcement and reduces exploitability of improper access control weaknesses.
Associating and retaining security attributes with data directly supports enforcement of access control decisions across storage, processing, and transmission.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Unrestricted file upload directly enables deployment of web shells on the server via arbitrary file manipulation in the web application.
NVD Description
A vulnerability was found in bolo-blog bolo-solo up to 2.6.4. Affected is an unknown function of the file src/main/java/org/b3log/solo/bolo/pic/PicUploadProcessor.java of the component FreeMarker Template Handler. The manipulation of the argument File results in unrestricted upload. It is possible to launch…
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the attack remotely. The exploit has been made public and could be used. The project was informed of the problem early through an issue report but has not responded yet.
Deeper analysisAI
CVE-2026-1813 is an unrestricted file upload vulnerability affecting bolo-blog bolo-solo versions up to 2.6.4. The issue resides in an unknown function within the file src/main/java/org/b3log/solo/bolo/pic/PicUploadProcessor.java, part of the FreeMarker Template Handler component. By manipulating the "File" argument, attackers can upload arbitrary files, as classified under CWE-284 (Improper Access Control) and CWE-434 (Unrestricted Upload of File with Dangerous Type).
The vulnerability carries a CVSS v3.1 base score of 6.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L), indicating medium severity. Exploitation requires low privileges (PR:L), such as an authenticated user with basic access, and can be performed remotely with low complexity and no user interaction. Successful attacks allow limited impacts on confidentiality, integrity, and availability, potentially enabling attackers to upload malicious files for further compromise.
Advisories from VulDB detail the issue, noting that an exploit is publicly available and the project was notified early via GitHub issue #329, but has not responded or issued patches as of the latest information. No mitigations or vendor fixes are currently documented in the provided references, including the bolo-solo GitHub repository. Practitioners should restrict upload functionalities and monitor for anomalous file uploads in affected deployments.
Details
- CWE(s)