Session fixation vulnerability in the Sessions subsystem in PHP before 5.5.2 allows remote attackers to hijack web sessions by specifying a…

published 2013-08-13 13 y ago modified 2026-06-16 4 mo ago also EUVD-2011-4636

cvss: 6.8; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 3.6%; EPSS 3.6% chance of exploitation in 30 days, percentile 89%
public exploits: 0; none known

Session fixation vulnerability in the Sessions subsystem in PHP before 5.5.2 allows remote attackers to hijack web sessions by specifying a session ID.

Patch / fix

distros 1

php7 openSUSE Tumbleweed 7.0.14-1.4
php5 openSUSE Tumbleweed 5.6.28-1.1

opensuse advisories openSUSE-SU-2024:10290-1 openSUSE-SU-2024:10344-1

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-2011-4718 updated 2026-11-05 cvss 5.8

php: session fixation vulnerability allows remote hijacking of sessions

Red Hat Enterprise Linux 5 php, php53 Red Hat Enterprise Linux 6 php, php-gd, php-cli, php-dba, php-fpm, php-pdo, +20 more Red Hat Enterprise Linux 7 php, php-gd, php-cli, php-dba, php-fpm, php-pdo, +18 more Red Hat Software Collections php54-php, php54-php-gd, php54-php-cli, php54-php-dba, php54-php-fpm, php54-php-pdo, +18 more
affected: no fix planned “Will not fix”

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

3.62% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness

CWE-264 Permissions, Privileges, and Access Controls

Technology feeds

PHP rss critical rss

References

Sources

CVE List CVE-2011-4718
NVD CVE-2011-4718

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