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SCA: security update for isso (GHSA-9fww-8cpr-q66r)

medium Tenable Cloud Security Plugin ID 437956

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2026-27469)

See Also

https://github.com/advisories/GHSA-9fww-8cpr-q66r

Plugin Details

Severity: Medium

ID: 437956

Version: Revision 1.5

Type: Local

Family: SCA Checks

Published: 2/24/2026

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 2.3

Percentile: 9.42

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

CVSS Score Source: CVE-2026-27469

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 2/24/2026

Vulnerability Publication Date: 2/21/2026

Reference Information

CVE: CVE-2026-27469