CVE-2026-40571: NamelessMC: Reactions on private or blocking profile posts can be modified without proper authorization

Severity: medium (CVSS 5.3 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-02 · updated 2026-07-21
Weakness: CWE-862

Description

NamelessMC is website software for Minecraft servers. In version 2.2.4, `core/classes/Misc/ProfilePostReactionContext.php` only verifies that the wall post exists and does not enforce blocked/private-profile visibility. This means that authenticated low-privileged users can add reactions to private or blocking profile posts. Version 2.2.5 contains a patch.

Affected products

NamelessMC Nameless: = 2.2.4

References

https://github.com/NamelessMC/Nameless/security/advisories/GHSA-47hr-jj6c-rqf9
https://github.com/NamelessMC/Nameless/security/advisories/GHSA-47hr-jj6c-rqf9

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