How severe is CVE-2018-1340?

CVE-2018-1340 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2018-1340 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-1340?

CVE-2018-1340 affects Apache Guacamole. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-1340?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-1340 published?

CVE-2018-1340 was published on 2019-02-07 and last updated on 2026-06-17.

CVE-2018-1340

CVE-2018-1340 is a high-severity vulnerability in Apache Guacamole with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-311.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-311
Affected product: Apache Guacamole
Published: 2019-02-07
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2018-1340?: 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.
How severe is CVE-2018-1340?: CVE-2018-1340 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2018-1340 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-1340?: CVE-2018-1340 affects Apache Guacamole. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-1340?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-1340 published?: CVE-2018-1340 was published on 2019-02-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:guacamole:*:*:*:*:*:*:*:*

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