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Vulnerability record · CVE-2021-3337 · published 28 January 2021

CVE-2021-3337: Hide thread content project hide thread content incorrect authorization vulnerability

HHide Thread Content Project · Hide Thread Content

The Hide-Thread-Content plugin through 2021-01-27 for MyBB allows remote attackers to bypass intended content-reading restrictions by clicking on reply or quote in the postbit.

7.5 CVSS 3.1 High EPSS 11% · top 4.1% CWE-863 · Incorrect authorization
7.5CVSS 3.1 base score, v2 5.0
11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

The Hide-Thread-Content plugin through 2021-01-27 for MyBB allows remote attackers to bypass intended content-reading restrictions by clicking on reply or quote in the postbit.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/161185/MyBB-Hide-Thread-Content-1.0-Information-Disclosure.html ExploitThird Party AdvisoryVDB Entry
https://github.com/snlbaral/Hide-Thread-Content/issues/1 ExploitThird Party Advisory
http://packetstormsecurity.com/files/161185/MyBB-Hide-Thread-Content-1.0-Information-Disclosure.html ExploitThird Party AdvisoryVDB Entry
https://github.com/snlbaral/Hide-Thread-Content/issues/1 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-3337), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.