How severe is CVE-2021-26834?

CVE-2021-26834 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-2021-26834 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26834?

CVE-2021-26834 affects Znote. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-26834?

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

When was CVE-2021-26834 published?

CVE-2021-26834 was published on 2021-06-18 and last updated on 2026-06-17.

CVE-2021-26834

CVE-2021-26834 is a medium-severity vulnerability in Znote 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% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Znote
Published: 2021-06-18
Last modified: 2026-06-17

Description

A cross-site scripting (XSS) vulnerability exists in Znote 0.5.2. An attacker can insert payloads, and the code execution will happen immediately on markdown view mode.

Frequently asked questions

What is CVE-2021-26834?: A cross-site scripting (XSS) vulnerability exists in Znote 0.5.2. An attacker can insert payloads, and the code execution will happen immediately on markdown view mode.
How severe is CVE-2021-26834?: CVE-2021-26834 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-2021-26834 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26834?: CVE-2021-26834 affects Znote. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-26834?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-26834 published?: CVE-2021-26834 was published on 2021-06-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:znote:znote:0.5.2:*:*:*:*:*:*:*

More vulnerabilities in Znote

CVE-2022-4614 — Medium (CVSS 5.4): Cross-site Scripting (XSS) - Stored in GitHub repository alagrede/znote-app prior to 1.7.11.

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