How severe is CVE-2020-27388?

CVE-2020-27388 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-2020-27388 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-27388?

CVE-2020-27388 affects Yourls. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-27388?

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

When was CVE-2020-27388 published?

CVE-2020-27388 was published on 2020-10-23 and last updated on 2026-07-05.

CVE-2020-27388

CVE-2020-27388 is a medium-severity vulnerability in Yourls 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% (51st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Yourls
Published: 2020-10-23
Last modified: 2026-07-05

Description

Multiple Stored Cross Site Scripting (XSS) vulnerabilities exist in the YOURLS Admin Panel, Versions 1.5 - 1.7.10. An authenticated user must modify a PHP plugin with a malicious payload and upload it, resulting in multiple stored XSS issues.

Frequently asked questions

What is CVE-2020-27388?: Multiple Stored Cross Site Scripting (XSS) vulnerabilities exist in the YOURLS Admin Panel, Versions 1.5 - 1.7.10. An authenticated user must modify a PHP plugin with a malicious payload and upload it, resulting in multiple stored XSS issues.
How severe is CVE-2020-27388?: CVE-2020-27388 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-2020-27388 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-27388?: CVE-2020-27388 affects Yourls. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-27388?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-27388 published?: CVE-2020-27388 was published on 2020-10-23 and last updated on 2026-07-05.

References

Affected products (1)

cpe:2.3:a:yourls:yourls:*:*:*:*:*:*:*:*

More vulnerabilities in Yourls

CVE-2019-14537 — Critical (CVSS 9.8): YOURLS through 1.7.3 is affected by a type juggling vulnerability in the api component that can result in login bypass.
CVE-2021-3734 — High (CVSS 8.8): yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames
CVE-2022-0088 — High (CVSS 7.4): Cross-Site Request Forgery (CSRF) in GitHub repository yourls/yourls prior to 1.8.3.
CVE-2021-3783 — Medium (CVSS 6.1): yourls is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2021-3785 — Medium (CVSS 5.4): yourls is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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