CVE-2025-66686: A stored Cross-Site Scripting (XSS) vulnerability exists in Perch CMS version 3.2

Routine

MEDIUM 6.1DOWNGRADE

CVE-2025-66686 is a medium-severity flaw (CVSS 6.1) affecting perch. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A stored Cross-Site Scripting (XSS) vulnerability exists in Perch CMS version 3.2. An authenticated attacker with administrative privileges can inject malicious JavaScript code into the “Help button url” setting within the admin panel. The injected payload is stored and executed when any authenticated user clicks the Help button, potentially leading to session hijacking, information disclosure, privilege escalation, and unauthorized administrativ

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-01-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: grabaperch

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-07 17:16 UTCPublished CVE record published
2026-06-17 09:57 UTCUpdated Record last modified

grabaperch perch DOWNGRADE

Affected: 3.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.2 (Debian / Ubuntu)

apt-cache madison perch sudo apt install perch=<VERSION_BEFORE_3.2> sudo apt-mark hold perch

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list perch sudo dnf downgrade perch-<VERSION_BEFORE_3.2> sudo dnf versionlock add perch

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-2025-66686?

perch: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-66686 being exploited?

CVE-2025-66686 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-2025-66686 affect?

CVE-2025-66686 affects perch. Severity is medium (CVSS 6.1). A stored Cross-Site Scripting (XSS) vulnerability exists in Perch CMS version 3.2. An authenticated attacker with administrative privileges can inject malicious JavaScript code into the “Help button url” setting within the admin panel. The

How urgent is CVE-2025-66686?

Priority 30/100. Public exploit reference

Related CVEs

CVE-2023-53890 MEDIUM 5.4 DOWNGRADE Perch CMS 3.2 contains a stored cross-site scripting vulnerability that allows authenticated users to upload m
CVE-2023-53889 HIGH 7.2 DOWNGRADE Perch CMS 3.2 contains a remote code execution vulnerability that allows authenticated administrators to uploa

References

← Back to latest CVEs