CVE-2020-27388: Multiple Stored Cross Site Scripting (XSS) vulnerabilities exist in the YOURLS Admin Panel, Versions 1.5 - 1.7

Routine

MEDIUM 5.4UPGRADE

CVE-2020-27388 is a medium-severity flaw (CVSS 5.4) affecting yourls. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-10-23
Last modified	2026-07-09

Publisher (CNA): MITRE · Vendor: yourls

Last updated 2026-07-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-10-23 20:15 UTCPublished CVE record published
2026-07-09 01:16 UTCUpdated Record last modified

yourls yourls UPGRADE

Affected: >= 1.5 and <= 1.7.10

Fixed in: newer than 1.7.10

Safe to downgrade to: a release before 1.5

1. Check installed version

apt-cache policy yourls || rpm -q yourls || yourls --version

2. UPGRADE to newer than 1.7.10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade yourls

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade yourls

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.5 (Debian / Ubuntu)

apt-cache madison yourls sudo apt install yourls=<VERSION_BEFORE_1.5> sudo apt-mark hold yourls

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list yourls sudo dnf downgrade yourls-<VERSION_BEFORE_1.5> sudo dnf versionlock add yourls

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-27388?

yourls: upgrade to newer than 1.7.10. Exact commands for each OS are on this page.

Is CVE-2020-27388 being exploited?

CVE-2020-27388 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-27388 affect?

CVE-2020-27388 affects yourls. Severity is medium (CVSS 5.4). 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 issue

How urgent is CVE-2020-27388?

Priority 32/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

Related CVEs

CVE-2022-0088 HIGH 7.4 UPGRADE Cross-Site Request Forgery (CSRF) in GitHub repository yourls/yourls prior to 1.8.3.
CVE-2021-3785 MEDIUM 5.4 UPGRADE yourls is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2021-3783 MEDIUM 6.1 UPGRADE yourls is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2021-3734 HIGH 8.8 UPGRADE yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames

References

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