vBulletin 5.x through 5.1.6 allows remote authenticated users to bypass authorization checks and inject private messages into conversations…

published 2017-09-19 9y ago modified 2026-06-17 4mo ago also EUVD-2015-3463

cvss: 6.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits: 0; none known

vBulletin 5.x through 5.1.6 allows remote authenticated users to bypass authorization checks and inject private messages into conversations via vectors related to an input validation failure.

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Exploit prediction

0.98% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.0	6.5	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD	2.0	4.0	AV:N/AC:L/Au:S/C:N/I:P/A:N

Classification

Weakness

CWE-20 Improper Input Validation

References

vbulletin.com /forum/forum/vbulletin-announcements/vbulletin-announcements_aa/4319488-security-patch-released-for-vbulletin-
vendor-advisory
openwall.com /lists/oss-security/2015/04/24/4
mailing-list, third-party-advisory

Sources

CVE List CVE-2015-3419
NVD CVE-2015-3419

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.