How severe is CVE-2019-12490?

CVE-2019-12490 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2019-12490 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-12490?

CVE-2019-12490 affects Simplemachines Simple Machines Forum. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-12490?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-12490 published?

CVE-2019-12490 was published on 2020-01-22 and last updated on 2026-06-17.

CVE-2019-12490

CVE-2019-12490 is a medium-severity vulnerability in Simplemachines Simple Machines Forum with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.3
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Simplemachines Simple Machines Forum
Published: 2020-01-22
Last modified: 2026-06-17

Description

An issue was discovered in Simple Machines Forum (SMF) before 2.0.16. Reverse tabnabbing can occur because of use of _blank for external links.

Frequently asked questions

What is CVE-2019-12490?: An issue was discovered in Simple Machines Forum (SMF) before 2.0.16. Reverse tabnabbing can occur because of use of _blank for external links.
How severe is CVE-2019-12490?: CVE-2019-12490 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2019-12490 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-12490?: CVE-2019-12490 affects Simplemachines Simple Machines Forum. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-12490?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-12490 published?: CVE-2019-12490 was published on 2020-01-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:simplemachines:simple_machines_forum:*:*:*:*:*:*:*:*

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