How severe is CVE-2021-27679?

CVE-2021-27679 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-2021-27679 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27679?

CVE-2021-27679 affects Batflat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27679?

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

When was CVE-2021-27679 published?

CVE-2021-27679 was published on 2021-03-11 and last updated on 2026-06-17.

CVE-2021-27679

CVE-2021-27679 is a medium-severity vulnerability in Batflat 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% (44th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Batflat
Published: 2021-03-11
Last modified: 2026-06-17

Description

Cross-site scripting (XSS) vulnerability in Navigation in Batflat CMS 1.3.6 allows remote attackers to inject arbitrary web script or HTML via the field name.

Frequently asked questions

What is CVE-2021-27679?: Cross-site scripting (XSS) vulnerability in Navigation in Batflat CMS 1.3.6 allows remote attackers to inject arbitrary web script or HTML via the field name.
How severe is CVE-2021-27679?: CVE-2021-27679 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-2021-27679 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27679?: CVE-2021-27679 affects Batflat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27679?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-27679 published?: CVE-2021-27679 was published on 2021-03-11 and last updated on 2026-06-17.

References

https://github.com/sruupl/batflat/issues/105

Affected products (1)

cpe:2.3:a:batflat:batflat:1.3.6:*:*:*:*:*:*:*

More vulnerabilities in Batflat

CVE-2021-41652 — High (CVSS 7.5): Insecure permissions in the file database.sdb of BatFlat CMS v1.3.6 allows attackers to dump the entire database.
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