How severe is CVE-2018-11756?

CVE-2018-11756 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-2018-11756 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-11756?

CVE-2018-11756 affects Apache Openwhisk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-11756?

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-2018-11756 published?

CVE-2018-11756 was published on 2018-07-23 and last updated on 2026-06-17.

CVE-2018-11756

CVE-2018-11756 is a critical-severity vulnerability in Apache Openwhisk 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.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 8% (94th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Apache Openwhisk
Published: 2018-07-23
Last modified: 2026-06-17

Description

In PHP Runtime for Apache OpenWhisk, a Docker action inheriting one of the Docker tags openwhisk/action-php-v7.2:1.0.0 or openwhisk/action-php-v7.1:1.0.1 (or earlier) may allow an attacker to replace the user function inside the container if the user code is vulnerable to code exploitation.

Frequently asked questions

What is CVE-2018-11756?: In PHP Runtime for Apache OpenWhisk, a Docker action inheriting one of the Docker tags openwhisk/action-php-v7.2:1.0.0 or openwhisk/action-php-v7.1:1.0.1 (or earlier) may allow an attacker to replace the user function inside the container if the user code is vulnerable to code exploitation.
How severe is CVE-2018-11756?: CVE-2018-11756 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-2018-11756 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-11756?: CVE-2018-11756 affects Apache Openwhisk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-11756?: 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-2018-11756 published?: CVE-2018-11756 was published on 2018-07-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:openwhisk:*:*:*:*:*:*:*:*

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