CVE-2018-25160Network attack vectorHinoki check available

Unauthenticated backend command injection via session IDs

Published Feb 27, 2026 · Updated Feb 27, 2026

Improper input validation in HTTP::Session2 1.09 and earlier allows remote attackers to inject backend commands through a session cookie. ServerStore::load_session passes the cookie-derived session identifier directly to the configured store's get method without rejecting control characters or excessive length. The consequence depends on the session backend; with memcached, newline-bearing identifiers can become injected memcached commands.

CVSS severity6.5
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Improper input validation in HTTP::Session2 1.09 and earlier allows remote attackers to inject backend commands through a session cookie. ServerStore::load_session passes the cookie-derived session identifier directly to the configured store's get method without rejecting control characters or excessive length. The consequence depends on the session backend; with memcached, newline-bearing identifiers can become injected memcached commands.

The record

CVE
CVE-2018-25160
Published
Feb 27, 2026
Updated
Feb 27, 2026
Vendor
Tokuhiro Matsuno
Product
HTTP::Session2
Classifications
CWE-20, CAPEC-248, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.09

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Tokuhiro Matsuno · HTTP::Session2version=0 <=1.09

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CAPEC-248Command Injection
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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