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CVE-2026-89260 moxi624 CVE debrief

CVE-2026-89260 is an XML external entity injection vulnerability in MoguBlog through version 6.2, affecting the WeChat callback handler. The vulnerability allows unauthenticated remote attackers to read arbitrary local files or trigger outbound HTTP requests by submitting malicious DOCTYPE declarations with external parameter entities. This issue is caused by the WechatRestApi.index() method passing the raw request body to SignUtil.xmlToMap(), which uses an unhardened dom4j SAXReader without DTD or external-entity restrictions. Defenders should assess exposure and prioritize patching or mitigation efforts.

Vendor
moxi624
Product
MoguBlog
CVSS
HIGH 8.7
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 installations should assess exposure and prioritize patching or mitigation efforts. This includes verifying the presence of affected versions, applying patches or mitigations, and monitoring for suspicious activity related to the WeChat callback handler. Security teams should review compensating controls for exposed systems and track exceptions and retest remediated assets.

Why it matters

CVE-2026-89260 is a high-severity vulnerability in MoguBlog that allows unauthenticated remote attackers to read local files or trigger HTTP requests. Defenders should prioritize verifying exposure and applying patches or mitigations.

  • Potential unauthorized access to local files
  • Possible triggering of outbound HTTP requests
  • Need for verification of MoguBlog installations
  • Potential for reflected entities in error responses

Technical summary

The vulnerability is caused by the WechatRestApi.index() method passing the raw request body to SignUtil.xmlToMap(), which uses an unhardened dom4j SAXReader without DTD or external-entity restrictions. This allows unauthenticated remote attackers to submit DOCTYPE declarations with external parameter entities to read arbitrary local files or trigger outbound HTTP requests. The vulnerability has a CVSS score of 8.7 and is classified as HIGH severity. Defenders should prioritize verifying exposure of MoguBlog installations to this vulnerability and apply patches or mitigations as available.

Defensive priority

Defenders should prioritize verifying exposure of MoguBlog installations to this vulnerability and apply patches or mitigations as available.

Recommended defensive actions

  • Verify MoguBlog installations for exposure to CVE-2026-89260
  • Apply patches or mitigations as available
  • Monitor for suspicious activity related to the WeChat callback handler
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score of 8.7 and HIGH severity. The vulnerability is caused by the WechatRestApi.index() method passing the raw request body to SignUtil.xmlToMap(), which uses an unhardened dom4j SAXReader.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-89260 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-89260

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-89260 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-89260

    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/C10_wechat_callback_unsigned.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_utils/src/main/java/com/moxi/mogublog/utils/wechat/SignUtil.java

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://github.com/moxi624/mogu_blog_v2/blob/025d78c7ac7e19b1abf796fa3cc158d855723d15/mogu_web/src/main/java/com/moxi/mogublog/web/restapi/WechatRestApi.java

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://www.vulncheck.com/advisories/mogublog-through-6.2-xml-external-entity-injection-in-the-unauthenticated-wechat-callback-endpoint

    [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.