What is CVE-2008-4929?

CVE-2008-4929 is a high-severity vulnerability in Mybb, classified under Use of Insufficiently Random Values. CVSS score: 7.5/10. Published 2008-11-04.

How severe is CVE-2008-4929?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Mybb

CVE-2008-4929

MyBB (aka MyBulletinBoard) 1.4.2 uses insufficient randomness to compose filenames of uploaded files used as attachments, which makes it easier for remote attackers to read these files by guessing filenames.

Published 2008-11-04 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.022 (82.2th percentile), scored 2026-09-28.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000

Affected products

Mybb — versions 1.4.2

Weakness classification (CWE)

CWE-330 — Use of Insufficiently Random Values

References

www.securityfocus.com/bid/31936 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
archives.neohapsis.com/archives/bugtraq/2008-10/0203.html (mailing-list, Exploit, Broken Link)
www.vupen.com/english/advisories/2008/2967 (vdb-entry, Broken Link)
archives.neohapsis.com/archives/fulldisclosure/2008-10/0472.html (mailing-list, Exploit, Broken Link)
www.openwall.com/lists/oss-security/2008/11/01/2 (mailing-list, Exploit, Mailing List)

Frequently asked questions

What is CVE-2008-4929?: CVE-2008-4929 is a high-severity vulnerability in Mybb, classified under Use of Insufficiently Random Values. CVSS score: 7.5/10. Published 2008-11-04.
How severe is CVE-2008-4929?: High severity. CVSS v3 base score is 7.5 out of 10.