How severe is CVE-2018-16278?

CVE-2018-16278 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-2018-16278 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-16278?

CVE-2018-16278 affects Phpkaiyuancms Phpopensourcecms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-16278?

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-2018-16278 published?

CVE-2018-16278 was published on 2018-08-31 and last updated on 2026-06-17.

CVE-2018-16278

CVE-2018-16278 is a critical-severity vulnerability in Phpkaiyuancms Phpopensourcecms 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-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-89
Affected product: Phpkaiyuancms Phpopensourcecms
Published: 2018-08-31
Last modified: 2026-06-17

Description

phpkaiyuancms PhpOpenSourceCMS (POSCMS) V3.2.0 allows an unauthenticated user to execute arbitrary SQL commands via the diy/module/member/controllers/Api.php ajax_save_draft function with the dir parameter.

Frequently asked questions

What is CVE-2018-16278?: phpkaiyuancms PhpOpenSourceCMS (POSCMS) V3.2.0 allows an unauthenticated user to execute arbitrary SQL commands via the diy/module/member/controllers/Api.php ajax_save_draft function with the dir parameter.
How severe is CVE-2018-16278?: CVE-2018-16278 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-2018-16278 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-16278?: CVE-2018-16278 affects Phpkaiyuancms Phpopensourcecms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-16278?: 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-2018-16278 published?: CVE-2018-16278 was published on 2018-08-31 and last updated on 2026-06-17.

References

https://github.com/howchen/howchen/issues/3

Affected products (1)

cpe:2.3:a:phpkaiyuancms:phpopensourcecms:3.2.0:*:*:*:*:*:*:*

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