CVE-2026-3877: A reflected cross-site scripting (XSS) vulnerability in the dashboard search functionality of the VertiGIS FM

Q: How do I fix CVE-2026-3877?

fm: upgrade to 10.13.403. Exact commands for each OS are on this page.

Q: Is CVE-2026-3877 being exploited?

CVE-2026-3877 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-3877 affect?

CVE-2026-3877 affects fm. Severity is medium (CVSS 6.1). A reflected cross-site scripting (XSS) vulnerability in the dashboard search functionality of the VertiGIS FM solution allows attackers to craft a malicious URL, that if visited by an authenticated victim, will execute arbitrary JavaScript

Q: How urgent is CVE-2026-3877?

Priority 28/100. Public exploit reference

Routine

MEDIUM 6.1UPGRADE

CVE-2026-3877 is a medium-severity flaw (CVSS 6.1) affecting fm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A reflected cross-site scripting (XSS) vulnerability in the dashboard search functionality of the VertiGIS FM solution allows attackers to craft a malicious URL, that if visited by an authenticated victim, will execute arbitrary JavaScript in the victim's context. Such a URL could be delivered through various means, for instance, by sending a link or by tricking victims to visit a page crafted by the attacker.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

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 92%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-01
Last modified	2026-10-26

Publisher (CNA): Switzerland Government Common Vulnerability Program · Vendor: vertigis

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-01 14:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

vertigis fm UPGRADE

Affected: < 10.13.403

Fixed in: 10.13.403

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 10.13.403 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fm

Note

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

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-2026-3877?

fm: upgrade to 10.13.403. Exact commands for each OS are on this page.

Is CVE-2026-3877 being exploited?

CVE-2026-3877 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-2026-3877 affect?

CVE-2026-3877 affects fm. Severity is medium (CVSS 6.1). A reflected cross-site scripting (XSS) vulnerability in the dashboard search functionality of the VertiGIS FM solution allows attackers to craft a malicious URL, that if visited by an authenticated victim, will execute arbitrary JavaScript

How urgent is CVE-2026-3877?

Priority 28/100. Public exploit reference

References

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