CVE-2023-53979

8.6 highEPSS 0.8%

High (8.6) in mybb mybb. EPSS 0.8% chance of exploitation in the next 30 days.

MyBB 1.8.32 contains a chained vulnerability that allows authenticated administrators to bypass avatar upload restrictions and execute arbitrary code. Attackers can modify upload path settings, upload a malicious PHP-embedded image file, and execute commands through the language configuration editing interface.

Severity

CVSS 4.0

8.6 high

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

8.8 high

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

EPSS: 0.8% chance of exploitation in the next 30 days; higher than 57% of CVEs (scores of 2026-10-31)
CWE: CWE-22
Published: 2025-12-22
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mybb:mybb

References

https://fdlucifer.github.io/2023/01/17/mybb1-8-32-LFI-RCE/
https://mybb.com/
https://www.exploit-db.com/exploits/51213
https://www.vulncheck.com/advisories/mybb-authenticated-remote-code-execution-via-chained-vulnerabilities
https://www.cve.org/CVERecord?id=CVE-2022-45867

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