---
title: "CVE-2026-103431: collectl - Stored XSS"
description: "collectl before 4.3.20.2 contains a stored XSS caused by unsanitized ANSI/VT100 escape sequences in data from remote instances, letting local users inject terminal escape sequences into operator's terminal, exploit requires local user on monitored host."
url: https://panop.io/threat-heartbeat/CVE-2026-103431/
---

# CVE-2026-103431 collectl - Stored XSS

collectl before 4.3.20.2 contains a stored XSS caused by unsanitized ANSI/VT100 escape sequences in data from remote instances, letting local users inject terminal escape sequences into operator's terminal, exploit requires local user on monitored host.

CVSS base score 7.7 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.18% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-103431)

## Details

Type

Stored XSS

Impact

Client Script Exec

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

Published

1 October 2026

Updated

15 October 2026

Weakness

[CWE-150](https://cwe.mitre.org/data/definitions/150.html)

## Vendor fix

Update to version 4.3.20.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-103431](https://nvd.nist.gov/vuln/detail/CVE-2026-103431)
- [https://access.redhat.com/security/cve/CVE-2026-103431](https://access.redhat.com/security/cve/CVE-2026-103431)
- [https://bugzilla.redhat.com/show\_bug.cgi?id=2543974](https://bugzilla.redhat.com/show_bug.cgi?id=2543974)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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