PatchSiren cyber security CVE debrief

CVE-2026-9581 jeecgboot CVE debrief

A low-severity improper access control vulnerability in JeecgBoot versions up to 3.9.1 allows authenticated remote attackers to manipulate the /sys/comment/add endpoint. The vulnerability was disclosed on 2026-05-26 with a CVSS 4.0 score of 2.1 (LOW severity). An upgrade to version 3.9.2 resolves the issue. The vulnerability is classified under CWE-266 (Incorrect Privilege Assignment) and CWE-284 (Improper Access Control). Public exploit availability is indicated in the CVSS vector (E:P), though no specific exploitation details are provided in the source corpus.

Vendor: jeecgboot
Product: JeecgBoot
CVSS: LOW 2.1
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-05-26
Original CVE updated: 2026-05-27
Advisory published: 2026-05-26
Advisory updated: 2026-05-27

Who should care

Organizations running JeecgBoot versions 3.9.1 or earlier should prioritize upgrading to 3.9.2. Security teams should monitor for anomalous comment creation activity. Developers using JeecgBoot should review access control implementations in custom comment functionality.

Technical summary

The vulnerability exists in an unknown function of the /sys/comment/add file in JeecgBoot versions up to 3.9.1. The improper access control allows manipulation by authenticated remote attackers. The attack complexity is low, requiring only low privileges and no user interaction. The vulnerability has low impact on confidentiality, integrity, and availability. Version 3.9.2 contains the fix for this issue.

Defensive priority

low

Recommended defensive actions

Upgrade JeecgBoot to version 3.9.2 or later to remediate this vulnerability
Review access controls on the /sys/comment/add endpoint if immediate patching is not feasible
Monitor for unauthorized comment creation attempts in application logs
Validate that authentication and authorization checks are properly enforced on all comment-related endpoints

Evidence notes

The vulnerability description identifies JeecgBoot up to version 3.9.1 as affected, with the specific endpoint /sys/comment/add being the impacted element. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L) indicates network attack vector with low attack complexity, requiring low privileges and no user interaction, with low impacts to confidentiality, integrity, and availability. The exploit availability flag (E:P) suggests public exploit existence. Remediation is confirmed through upgrade to version 3.9.2.

Official resources

2026-05-26