CVE-2018-25100Network attack vector

Cookie disclosure via missing host-only tracking

Published Mar 24, 2024 · Updated Apr 10, 2025

Cookie disclosure in Mojolicious before 7.66 allows remote attackers to receive cookies sent by Mojo::UserAgent across host boundaries. Mojo::UserAgent::CookieJar leaves host-only cookies without an explicit host-only flag and retains stale same-name cookies, so later matching can send them to a different host. Exploitation requires an application to use the user agent with multiple similar cookies and request an attacker-controlled host, exposing cookie values without granting data modification.

CVSS severity5.3
Medium
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cookie disclosure in Mojolicious before 7.66 allows remote attackers to receive cookies sent by Mojo::UserAgent across host boundaries. Mojo::UserAgent::CookieJar leaves host-only cookies without an explicit host-only flag and retains stale same-name cookies, so later matching can send them to a different host. Exploitation requires an application to use the user agent with multiple similar cookies and request an attacker-controlled host, exposing cookie values without granting data modification.

The record

CVE
CVE-2018-25100
Published
Mar 24, 2024
Updated
Apr 10, 2025
Vendor
Mojolicious
Product
Mojolicious
Classifications
CWE-400, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 24, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 10, 2025Record 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 <7.66

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mojolicious · Mojoliciousversion=0 <7.66

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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-400Uncontrolled Resource Consumption
T1539Steal Web Session Cookie

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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