Is CVE-2026-27469 actively exploited?

No active exploitation of CVE-2026-27469 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-27469 be exploited remotely?

Yes. CVE-2026-27469 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-27469?

CVE-2026-27469 has a CVSS score of 6.1 (MEDIUM) and an EPSS exploitation probability of 0.06%.

HOME VULNERABILITIESCVE-2026-27469

MEDIUM

CVE-2026-27469

CWE-79Published: February 21, 2026· Updated: Feb 23, 2026

6.1

CVSS v3.1

EPSS:0.06%probability of exploitation in 30 daysPercentile:18.6th

Official Description

Isso is a lightweight commenting server written in Python and JavaScript. In commits before 0afbfe0691ee237963e8fb0b2ee01c9e55ca2144, there is a stored Cross-Site Scripting (XSS) vulnerability affecting the website and author comment fields. The website field was HTML-escaped using quote=False, which left single and double quotes unescaped. Since the frontend inserts the website value directly into a single-quoted href attribute via string concatenation, a single quote in the URL breaks out of the attribute context, allowing injection of arbitrary event handlers (e.g. onmouseover, onclick). The same escaping is missing entirely from the user-facing comment edit endpoint (PUT /id/) and the moderation edit endpoint (POST /id//edit/). This issue has been patched in commit 0afbfe0691ee237963e8fb0b2ee01c9e55ca2144. To workaround, nabling comment moderation (moderation = enabled = true in isso.cfg) prevents unauthenticated users from publishing comments, raising the bar for exploitation, but it does not fully mitigate the issue since a moderator activating a malicious comment would still expose visitors.

NVD Source

Technical Analysis

CVE-2026-27469 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.