CVE-2026-45128Network attack vector

Administrator view tampering via unprotected GET

Published Aug 18, 2026 · Updated Aug 18, 2026

Cross-site request forgery in MyBB ACP Users View Manager before 1.8.40 lets attackers alter an administrator's default user view through a crafted URL. In admin/inc/functions_view_manager.php, the view_manager set_default path performed a state-changing action on a GET request and, before 1.8.40, did not verify my_post_key before saving the selected default view. Reachability requires placing or triggering a same-site link that a logged-in administrator loads, and the result is limited to integrity changes in that administrator's saved ACP user-list filtering and sorting.

CVSS severity3.5
Low
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in MyBB ACP Users View Manager before 1.8.40 lets attackers alter an administrator's default user view through a crafted URL. In admin/inc/functions_view_manager.php, the view_manager set_default path performed a state-changing action on a GET request and, before 1.8.40, did not verify my_post_key before saving the selected default view. Reachability requires placing or triggering a same-site link that a logged-in administrator loads, and the result is limited to integrity changes in that administrator's saved ACP user-list filtering and sorting.

The record

CVE
CVE-2026-45128
Published
Aug 18, 2026
Updated
Aug 18, 2026
Vendor
MyBB
Product
MyBB
Classifications
CWE-352
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.8.40

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

MyBB · MyBBversion=< 1.8.40

Published CVSS scores

3.5MyBBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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