How severe is CVE-2021-45786?

CVE-2021-45786 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-2021-45786 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-2021-45786?

CVE-2021-45786 affects Maccms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-45786?

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-2021-45786 published?

CVE-2021-45786 was published on 2022-03-16 and last updated on 2026-06-17.

CVE-2021-45786

CVE-2021-45786 is a critical-severity vulnerability in Maccms 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-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Maccms
Published: 2022-03-16
Last modified: 2026-06-17

Description

In maccms v10, an attacker can log in through /index.php/user/login in the "col" and "openid" parameters to gain privileges.

Frequently asked questions

What is CVE-2021-45786?: In maccms v10, an attacker can log in through /index.php/user/login in the "col" and "openid" parameters to gain privileges.
How severe is CVE-2021-45786?: CVE-2021-45786 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-2021-45786 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-2021-45786?: CVE-2021-45786 affects Maccms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-45786?: 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-2021-45786 published?: CVE-2021-45786 was published on 2022-03-16 and last updated on 2026-06-17.

References

https://github.com/magicblack/maccms10/issues/747

Affected products (1)

cpe:2.3:a:maccms:maccms:10.0:*:*:*:*:*:*:*

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Other CWE-287 (Improper Authentication) vulnerabilities

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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…

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