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CVE-2018-11385

26
FAUCET Score

CVE-2018-11385 is a session fixation vulnerability in the Security component of Symfony versions 2.7.x, 2.8.x, 3.3.x, 3.4.x, and 4.0.x, impacting Debian and Fedora distributions. This flaw allows an attacker to impersonate a victim if they previously knew the session ID. Rated with a CVSS score of 8.1 (HIGH), it has a network attack vector and high impact on confidentiality, integrity, and availability, though it requires high attack complexity. There is no evidence of active exploitation, public exploit code, or significant community discussion, and it is not listed in CISA's KEV catalog.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.7.0, < 2.7.48CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 2.8.0, < 2.8.41CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 3.3.0, < 3.3.17CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 3.4.0, < 3.4.11CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 4.0.0, < 4.0.11CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.1HIGH

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.01%
Probability of exploitation in next 30 days
EPSS Percentile
78.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0201 is in the 36th percentile among its peer group of 8,920 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 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

Patch Available

Vendor Patches (15)

composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 2.7.48
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 2.8.41
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 3.4.11
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 4.0.11
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 3.3.17
composerpatch availablevia ghsa
Product: symfony/security-httpFixed in: 2.7.48
composerpatch availablevia ghsa
Product: symfony/security-httpFixed in: 2.8.41
composerpatch availablevia ghsa
Product: symfony/security-httpFixed in: 3.3.17
composerpatch availablevia ghsa
Product: symfony/security-httpFixed in: 3.4.11
composerpatch availablevia ghsa
Product: symfony/security-httpFixed in: 4.0.11
composerpatch availablevia ghsa
Product: symfony/securityFixed in: 2.7.48
composerpatch availablevia ghsa
Product: symfony/securityFixed in: 2.8.41
composerpatch availablevia ghsa
Product: symfony/securityFixed in: 3.3.17
composerpatch availablevia ghsa
Product: symfony/securityFixed in: 3.4.11
composerpatch availablevia ghsa
Product: symfony/securityFixed in: 4.0.11

Vendor Advisories (1)

composerGHSA-g4rg-rw65-8hfghigh

Symfony Session Fixation Vulnerability

May 14, 2022

References

lists.debian.org / debian-lts-announce/2019/03/msg00009.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/G4XNBMFW33H47O5TZGA7JYCVLDBCXAJV
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/UBQK7JDXIELADIPGZIOUCZKMAJM5LSBW
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/WU5N2TZFNGXDGMXMPP7LZCWTFLENF6WH
symfony.com / blog/cve-2018-11385-session-fixation-issue-for-guard-authentication
Vendor Advisory
debian.org / security/2018/dsa-4262
Third Party Advisory