How severe is CVE-2019-12136?

CVE-2019-12136 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2019-12136 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-12136?

CVE-2019-12136 affects Boostio Boostnote. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-12136?

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

When was CVE-2019-12136 published?

CVE-2019-12136 was published on 2019-05-16 and last updated on 2026-06-17.

CVE-2019-12136

CVE-2019-12136 is a medium-severity vulnerability in Boostio Boostnote with a CVSS 3.x base score of 5.4. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Boostio Boostnote
Published: 2019-05-16
Last modified: 2026-06-17

Description

There is XSS in BoostIO Boostnote 0.11.15 via a label named mermaid, as demonstrated by a crafted SRC attribute of an IFRAME element.

Frequently asked questions

What is CVE-2019-12136?: There is XSS in BoostIO Boostnote 0.11.15 via a label named mermaid, as demonstrated by a crafted SRC attribute of an IFRAME element.
How severe is CVE-2019-12136?: CVE-2019-12136 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2019-12136 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-12136?: CVE-2019-12136 affects Boostio Boostnote. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-12136?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-12136 published?: CVE-2019-12136 was published on 2019-05-16 and last updated on 2026-06-17.

References

https://github.com/BoostIO/Boostnote/issues/3007

Affected products (1)

cpe:2.3:a:boostio:boostnote:0.11.15:*:*:*:*:*:*:*

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