How severe is CVE-2018-12678?

CVE-2018-12678 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-12678 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-12678?

CVE-2018-12678 affects Portainer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-12678?

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

When was CVE-2018-12678 published?

CVE-2018-12678 was published on 2018-06-22 and last updated on 2026-06-17.

CVE-2018-12678

CVE-2018-12678 is a critical-severity vulnerability in Portainer with a CVSS 3.x base score of 9.8. 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-918.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-918
Affected product: Portainer
Published: 2018-06-22
Last modified: 2026-06-17

Description

Portainer before 1.18.0 supports unauthenticated requests to the websocket endpoint with an unvalidated id query parameter for the /websocket/exec endpoint, which allows remote attackers to bypass intended access restrictions or conduct SSRF attacks.

Frequently asked questions

What is CVE-2018-12678?: Portainer before 1.18.0 supports unauthenticated requests to the websocket endpoint with an unvalidated id query parameter for the /websocket/exec endpoint, which allows remote attackers to bypass intended access restrictions or conduct SSRF attacks.
How severe is CVE-2018-12678?: CVE-2018-12678 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-12678 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-12678?: CVE-2018-12678 affects Portainer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-12678?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2018-12678 published?: CVE-2018-12678 was published on 2018-06-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:portainer:portainer:*:*:*:*:*:*:*:*

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