CVE-2026-108647 jeecgboot CVE debrief

Who should care

System administrators and security teams responsible for JeecgBoot installations, especially those with low-privileged user access to the SysCheckRuleController importExcel handler, should assess exposure and prioritize remediation.

Why it matters

CVE-2026-108647 is a missing authorization vulnerability in JeecgBoot that allows low-privileged authenticated users to create validation rules with arbitrary regular expression patterns. Defenders should prioritize verifying and remediating this vulnerability, especially in systems where low-privileged users have access to the SysCheckRuleController importExcel handler. The exact scope of affected systems and versions requires further verification from official sources.

• Potential creation of system-wide encoding validation rules with arbitrary regular expression patterns.
• Bypassing of the system:checkRule:add permission.
• Possible exploitation by low-privileged authenticated users.
• Verification of affected versions and remediation efforts required.

Technical summary

The vulnerability exists in the SysCheckRuleController importExcel handler of JeecgBoot, allowing low-privileged authenticated users to create system-wide encoding validation rules with arbitrary regular expression patterns by uploading a crafted Excel workbook. This could lead to security risks if not properly mitigated. Defenders should assess exposure and prioritize remediation, especially in systems where low-privileged users have access to the SysCheckRuleController importExcel handler. The vulnerability's technical impact includes potential for unauthorized system changes and data exposure.

Defensive priority

Defenders should prioritize verifying and remediating this vulnerability, especially in systems where low-privileged users have access to the SysCheckRuleController importExcel handler.

Recommended defensive actions

• Verify the version of JeecgBoot in use and check if it is vulnerable (version 3.9.5 or earlier).
• Restrict access to the SysCheckRuleController importExcel handler to authorized users.
• Implement additional monitoring to detect and respond to potential exploitation attempts.
• Review and update validation rules created through the SysCheckRuleController importExcel handler.
• Conduct a thorough review of system-wide encoding validation rules for potential security risks.
• Perform a security audit to identify and address any existing exploitation attempts.
• Engage with the JeecgBoot community or vendor for support and guidance on remediation efforts.

Evidence notes

The CVE record and NVD entry provide details about the vulnerability. However, the exact scope of affected systems and versions requires further verification from official sources. Defenders should verify the vulnerability's impact on their systems, especially where low-privileged users have access to the SysCheckRuleController importExcel handler. This includes reviewing system-wide encoding validation rules and assessing potential exploitation attempts.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.