MediaWiki before 1.23.12, 1.24.x before 1.24.5, 1.25.x before 1.25.4, and 1.26.x before 1.26.1 do not properly normalize IP addresses conta…

published 2017-03-23 9 y ago modified 2026-06-17 4 mo ago also EUVD-2015-8504

cvss: 5.3; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.4%; EPSS 1.4% chance of exploitation in 30 days, percentile 71%
public exploits: 0; none known

MediaWiki before 1.23.12, 1.24.x before 1.24.5, 1.25.x before 1.25.4, and 1.26.x before 1.26.1 do not properly normalize IP addresses containing zero-padded octets, which might allow remote attackers to bypass intended access restrictions by using an IP address that was not supposed to have been allowed.

Patch / fix

distros 1 links 4

mediawiki Debian 14, Debian 13, Debian 12 1:1.25.5-1

debian advisories DEBIAN-CVE-2015-8627

phabricator.wikimedia.org/T97897 advisory
lists.wikimedia.org/pipermail/mediawiki-announce/2015-December/000186.html advisory
openwall.com/lists/oss-security/2015/12/23/7 advisory
openwall.com/lists/oss-security/2015/12/21/8 advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-8627 updated 2025-11-21 cvss 5.8

mediawiki: multiple flaws fixed in 1.26.1, 1.25.4, 1.24.5, and 1.23.12

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.36% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.0	5.3	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:P/A:N

Classification

Weakness

CWE-284 Improper Access Control

References

phabricator.wikimedia.org /T97897
patch, third-party-advisory
lists.wikimedia.org /pipermail/mediawiki-announce/2015-December/000186.html
mailing-list, patch, release-notes, vendor-advisory
openwall.com /lists/oss-security/2015/12/23/7
mailing-list, patch, third-party-advisory
openwall.com /lists/oss-security/2015/12/21/8
mailing-list, patch, third-party-advisory

Sources

CVE List CVE-2015-8627
NVD CVE-2015-8627

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.

Summary