How severe is CVE-2021-3271?

CVE-2021-3271 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-3271 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3271?

CVE-2021-3271 affects Pressbooks. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3271?

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

When was CVE-2021-3271 published?

CVE-2021-3271 was published on 2021-02-18 and last updated on 2026-06-17.

CVE-2021-3271

CVE-2021-3271 is a medium-severity vulnerability in Pressbooks with a CVSS 3.x base score of 4.8. 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 4.8)
CVSS v2: 3.5
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Pressbooks
Published: 2021-02-18
Last modified: 2026-06-17

Description

PressBooks 5.17.3 contains a cross-site scripting (XSS). Stored XSS can be submitted via the Book Info's Long Description Body, and all actions to open or preview the books page will result in the triggering the stored XSS.

Frequently asked questions

What is CVE-2021-3271?: PressBooks 5.17.3 contains a cross-site scripting (XSS). Stored XSS can be submitted via the Book Info's Long Description Body, and all actions to open or preview the books page will result in the triggering the stored XSS.
How severe is CVE-2021-3271?: CVE-2021-3271 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-3271 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3271?: CVE-2021-3271 affects Pressbooks. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3271?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-3271 published?: CVE-2021-3271 was published on 2021-02-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:pressbooks:pressbooks:*:*:*:*:*:*:*:*

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