How severe is CVE-2018-18891?

CVE-2018-18891 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 none, integrity high, and availability none.

Is CVE-2018-18891 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-18891?

CVE-2018-18891 affects 1234n Minicms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-18891?

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-2018-18891 published?

CVE-2018-18891 was published on 2018-11-01 and last updated on 2026-06-17.

CVE-2018-18891

CVE-2018-18891 is a high-severity vulnerability in 1234n Minicms 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-287.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 6.4
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: 1234n Minicms
Published: 2018-11-01
Last modified: 2026-06-17

Description

MiniCMS 1.10 allows file deletion via /mc-admin/post.php?state=delete&delete= because the authentication check occurs too late.

Frequently asked questions

What is CVE-2018-18891?: MiniCMS 1.10 allows file deletion via /mc-admin/post.php?state=delete&delete= because the authentication check occurs too late.
How severe is CVE-2018-18891?: CVE-2018-18891 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 none, integrity high, and availability none.
Is CVE-2018-18891 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-18891?: CVE-2018-18891 affects 1234n Minicms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-18891?: 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-2018-18891 published?: CVE-2018-18891 was published on 2018-11-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:1234n:minicms:1.10:*:*:*:*:*:*:*

More vulnerabilities in 1234n Minicms

CVE-2020-19896 — Critical (CVSS 9.8): File inclusion vulnerability in Minicms v1.9 allows remote attackers to execute arbitary PHP code via post-edit.php.
CVE-2020-36052 — Critical (CVSS 9.8): Directory traversal vulnerability in post-edit.php in MiniCMS V1.10 allows remote attackers to include and execute…
CVE-2018-18892 — Critical (CVSS 9.8): MiniCMS 1.10 allows execution of arbitrary PHP code via the install.php sitename parameter, which affects the site_name…
CVE-2021-33387 — Critical (CVSS 9.6): Cross Site Scripting Vulnerability in MiniCMS v.1.10 allows attacker to execute arbitrary code via a crafted get…
CVE-2018-9092 — High (CVSS 8.8): There is a CSRF vulnerability in mc-admin/conf.php in MiniCMS 1.10 that can change the administrator account password.
CVE-2022-33121 — High (CVSS 8.1): A Cross-Site Request Forgery (CSRF) in MiniCMS v1.11 allows attackers to arbitrarily delete local .dat files via…

All CVEs affecting 1234n Minicms →

Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-45480 — Critical (CVSS 10.0): Improper authentication in Azure Active Directory allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-46389 — Critical (CVSS 10.0): UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS…
CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

Browse all CWE-287 (Improper Authentication) vulnerabilities →