PatchSiren cyber security CVE debrief

CVE-2026-89261 moxi624 CVE debrief

CVE-2026-89261 is a vulnerability in MoguBlog through version 6.2, exposing Elasticsearch index management endpoints in the mogu_search service without authentication. This allows remote attackers to delete, recreate, or alter the blog search index. Attackers can invoke POST endpoints to wipe the entire search index, delete specific documents, or inject malicious index entries, causing search functionality to return incorrect or no results.

Vendor: moxi624
Product: MoguBlog
CVSS: MEDIUM 6.9
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-09-11
Original CVE updated: 2026-09-11
Advisory published: 2026-09-11
Advisory updated: 2026-09-11

Who should care

Defenders responsible for MoguBlog instances, security teams, and administrators of Elasticsearch services should be aware of this vulnerability and take necessary actions to secure their environments.

Why it matters

CVE-2026-89261 is a medium-severity vulnerability in MoguBlog that allows remote attackers to manipulate Elasticsearch index management endpoints without authentication, potentially impacting search functionality.

Search functionality may return incorrect or no results due to index manipulation
Defenders need to verify the presence of this vulnerability in their MoguBlog instances
Remediation involves ensuring proper authentication for Elasticsearch index management endpoints

Technical summary

The vulnerability exists in the mogu_search service of MoguBlog through version 6.2, where Elasticsearch index management endpoints are exposed without authentication. This allows remote attackers to perform various actions on the search index, including deletion, recreation, and alteration. The impact of this vulnerability is that search functionality may return incorrect or no results due to index manipulation. Defenders should prioritize verifying the presence of this vulnerability in their MoguBlog instances and ensuring proper authentication for Elasticsearch index management endpoints. Additionally, defenders should review and update access controls for the mogu_search service to prevent unauthorized use.

Defensive priority

Defenders should prioritize verifying the presence of this vulnerability in their MoguBlog instances and ensuring proper authentication for Elasticsearch index management endpoints.

Recommended defensive actions

Verify the presence of this vulnerability in MoguBlog instances
Ensure proper authentication for Elasticsearch index management endpoints
Review and update access controls for the mogu_search service
Perform a thorough review of the Elasticsearch index management endpoints for any potential security risks
Implement monitoring to detect any suspicious activity related to the mogu_search service
Conduct an asset inventory to identify all instances of MoguBlog that may be affected by this vulnerability
Review and update incident response plans to include procedures for responding to potential exploitation of this vulnerability

Evidence notes

The CVE record and NVD entry provide details about the vulnerability, including its description and CVSS score. However, the exact versions affected and the remediation steps are not explicitly mentioned in the provided sources.

Sources and references

Verified primary and authoritative sources

CVE-2026-89261 CVE Program record
Publisher, destination, and source semantics verified

URL: https://www.cve.org/CVERecord?id=CVE-2026-89261

CVE Program - Official CVE Program record with source-provided CVE metadata.
CVE-2026-89261 NVD vulnerability detail
Publisher, destination, and source semantics verified

URL: https://nvd.nist.gov/vuln/detail/CVE-2026-89261

NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Source reference
Unverified legacy reference

URL: https://gitee.com/moxi159753/mogu_blog_v2/releases

[email protected]
Source reference
Unverified legacy reference

URL: https://github.com/LinYuanyi1/cve-request-poc/blob/master/mogublog-poc/C05_search_initElasticSearchIndex.py

[email protected]
Source reference
Unverified legacy reference

URL: https://github.com/LinYuanyi1/cve-request-poc/blob/master/mogublog-poc/C06_search_deleteElasticSearchByUids.py

[email protected]
Source reference
Unverified legacy reference

URL: https://github.com/LinYuanyi1/cve-request-poc/blob/master/mogublog-poc/C07_search_deleteElasticSearchByUid.py

[email protected]
Source reference
Unverified legacy reference

URL: https://github.com/LinYuanyi1/cve-request-poc/blob/master/mogublog-poc/C11_search_addElasticSearchIndexByUid.py

[email protected]
Source reference
Unverified legacy reference

URL: https://github.com/moxi624/mogu_blog_v2

[email protected]
Source reference
Unverified legacy reference

URL: https://github.com/moxi624/mogu_blog_v2/blob/025d78c7ac7e19b1abf796fa3cc158d855723d15/mogu_search/src/main/java/com/moxi/mogublog/search/config/WebSecurityConfig.java

[email protected]
Source reference
Unverified legacy reference

URL: https://github.com/moxi624/mogu_blog_v2/blob/025d78c7ac7e19b1abf796fa3cc158d855723d15/mogu_search/src/main/java/com/moxi/mogublog/search/restapi/ElasticSearchRestApi.java

[email protected]

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.