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CVE-2011-5133

27
FAUCET Score

CVE-2011-5133 describes an unspecified vulnerability in MyBB versions prior to 1.6.5, specifically related to an "unparsed user avatar in the buddy list." This flaw carries a critical CVSS score of 10.0, indicating a severe impact with complete compromise of confidentiality, integrity, and availability, achievable remotely with low attack complexity and no authentication required. Despite its high severity, there is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.6.4CPE matchmatch criteria
cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:*
1.1.0CPE matchmatch criteria
cpe:2.3:a:mybb:mybb:1.1.0:*:*:*:*:*:*:*
1.1.1CPE matchmatch criteria
cpe:2.3:a:mybb:mybb:1.1.1:*:*:*:*:*:*:*
1.1.2CPE matchmatch criteria
cpe:2.3:a:mybb:mybb:1.1.2:*:*:*:*:*:*:*
1.1.3CPE matchmatch criteria
cpe:2.3:a:mybb:mybb:1.1.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

10.0HIGH

AV:N/AC:L/Au:N/C:C/I:C/A:C

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.68%
Probability of exploitation in next 30 days
EPSS Percentile
74.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0168 is in the 57th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

blog.mybb.com / 2011/11/25/mybb-1-6-5-released-feature-update-security-maintenance-release
Vendor Advisory
secunia.com / advisories/46951
Vendor Advisory
osvdb.org / 77325
securityfocus.com / bid/50816