VulnerabilityModified
CVE-2023-53979
MyBB 1.8.32 contains a chained vulnerability that allows authenticated administrators to bypass avatar upload restrictions and execute arbitrary code.
HIGH 8.6EPSS 0.80%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.80%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 4.0
- 8.6 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.80% probability · 55th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-22
- Affected
- mybb/mybb
- Source
- disclosure@vulncheck.com
References
- https://fdlucifer.github.io/2023/01/17/mybb1-8-32-LFI-RCE/Exploit, Third Party Advisory
- https://mybb.com/Product
- https://www.exploit-db.com/exploits/51213Exploit
- https://www.vulncheck.com/advisories/mybb-authenticated-remote-code-execution-via-chained-vulnerabilitiesExploit, Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2022-45867
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.