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Not in CISA KEV
HIGH severity

CVE-2018-1340 — guacamole-common

HIGH

CVE-2018-1340 is a high-severity (CVSS 7.5) CWE-311 vulnerability in org.apache.guacamole:guacamole-common. A fix is available for org.apache.guacamole:guacamole-common — see the affected versions and patch details below.

Missing Encryption of Sensitive Data in Apache Guacamole

Also known asGHSA-wr7r-vg3c-54r5
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 31, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.0%probability of exploitation in next 30 days
Lower Risk-0.06%
Lower risk than most CVEs81th percentile — riskier than 81% of all scored CVEsHighest risk
0.13%0.96%1.78%2.60%0.6%2.0%May 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
☕org.apache.guacamole:guacamole-common

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Prior to 1.0.0, Apache Guacamole used a cookie for client-side storage of the user's session token. This cookie lacked the "secure" flag, which could allow an attacker eavesdropping on the network to intercept the user's session token if unencrypted HTTP requests are made to the same domain.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.apache.guacamole:guacamole-commonall versions1.0.0org.apache.guacamole:guacamole-common:1.0.0

Affected Products

1 product · 1 configurations
Application
guacamoleapache
≤ 0.9.14
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.guacamole:guacamole-common, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.apache.guacamole:guacamole-common to 1.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-1340 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

Prior to 1.0.0, Apache Guacamole used a cookie for client-side storage of the user's session token. This cookie lacked the "secure" flag, which could allow an attacker eavesdropping on the network to intercept the user's session token if unencrypted HTTP requests are made to the same domain.
O3 Security · Impact-Aware SCA

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CVE-2018-1340: guacamole-common — Fixed in 1.0.0