How severe is CVE-2021-25987?

CVE-2021-25987 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-25987 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25987?

CVE-2021-25987 affects Hexo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-25987?

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

When was CVE-2021-25987 published?

CVE-2021-25987 was published on 2021-11-30 and last updated on 2026-06-17.

CVE-2021-25987

CVE-2021-25987 is a medium-severity vulnerability in Hexo with a CVSS 3.x base score of 5.0. 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 5.0)
CVSS v2: 1.9
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Hexo
Published: 2021-11-30
Last modified: 2026-06-17

Description

Hexo versions 0.0.1 to 5.4.0 are vulnerable against stored XSS. The post “body” and “tags” don’t sanitize malicious javascript during web page generation. Local unprivileged attacker can inject arbitrary code.

Frequently asked questions

What is CVE-2021-25987?: Hexo versions 0.0.1 to 5.4.0 are vulnerable against stored XSS. The post “body” and “tags” don’t sanitize malicious javascript during web page generation. Local unprivileged attacker can inject arbitrary code.
How severe is CVE-2021-25987?: CVE-2021-25987 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-25987 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25987?: CVE-2021-25987 affects Hexo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-25987?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-25987 published?: CVE-2021-25987 was published on 2021-11-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hexo:hexo:*:*:*:*:*:node.js:*:*

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