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Signals Exploited in the wild (KEV) 0 Patch available 1 No fix listed 0 Has CVE 1

Fix status Fixed 1 Partial 0 Will not fix 0 Deferred 0 No fix listed 0

Impact type Code execution 0 Privilege escalation 0 Security bypass 0 Information disclosure 0 Tampering 0 Denial of service 0 Spoofing 0 Cross-site scripting 1 SQL injection 0

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Requirements No authentication 1 No user interaction 0

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Weakness (CWE) CWE-116 Improper Encoding or Escaping of Output 1 CWE-79 Improper Neutralization of Input During Web Page Generation 1

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Vendor: isso-comments × Clear all filters

TI-2026-21876 CVE-2026-27469 · GHSA-9fww-8cpr-q66r

Isso: Stored XSS via comment website field

Priority LOW 27

Isso is a lightweight commenting server written in Python and JavaScript.

CVSS 3.1MEDIUM 6.1· Network · No auth · User interaction · EPSS 0.00259 · Published 2026-02-21 · Fixed in 0afbfe0691ee237963e8fb0b2ee01c9e55ca2144, 0.13.2 CWE-116

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