What’s Vulnerable › Vulnerabilities

CVE-2018-19131

• Severity: medium (CVSS 6.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-11-09 · updated 2026-06-17
• Weakness: CWE-79

Description

Squid before 4.4 has XSS via a crafted X.509 certificate during HTTP(S) error page generation for certificate errors.

Affected products

• Squid: before 4.4 — fixed in 4.4

How to fix

Upgrade to a fixed version: Squid 4.4. Check the vendor advisory for mitigations.

References

• http://www.squid-cache.org/Advisories/SQUID-2018_4.txt
• http://www.squid-cache.org/Versions/v5/changesets/squid-5-6feeb15ff312f3e145763adf8d234ed6a0b3f11d.patch
• https://github.com/squid-cache/squid/pull/306
• http://www.squid-cache.org/Advisories/SQUID-2018_4.txt
• http://www.squid-cache.org/Versions/v5/changesets/squid-5-6feeb15ff312f3e145763adf8d234ed6a0b3f11d.patch
• https://github.com/squid-cache/squid/pull/306

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