CVE-2026-58446: presenton · Missing Authentication
Affects presentonSource CVE Database V5
Public exploit available · CVSS 6.5 Medium : upgrade to 0.8.8-beta as a priority.
Data as of 8 Nov 2026, 14:35 UTC
Thin evidence
One scorer or none| CNA (VulnCheck) | CVSS 3.1 | 6.5 |
|---|---|---|
| CNA (VulnCheck) | CVSS 4.0 | 6.9 |
- CISA SSVC
- Exploitation
- Proof of concept is public or traded
- Automatable
- Attackers can reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-07-01.
- Patch
- Available – fixed in 0.8.8-beta
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:LExploitation evidence
t = 0 is the CVE’s publication on cve.org
Disclosed: evidence found.
CVE published 30 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
CISA SSVC: proof of concept public
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
Timeline
CVE ID reserved
by VulnCheck
, 2 hours before disclosure
CVE published
on cve.org
, t = 0
CISA SSVC assessment
proof of concept public
, 17 hours after disclosure
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA SSVC, the Metasploit, Exploit-DB and nuclei-templates index as of 8 Nov 2026.
What to do
Upgrade presenton to 0.8.8-beta.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| presentonpresenton | Affected
| Fixed in
|
GitHubpresentonpkg:github/presentonOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Upgrade Presenton to version 0.8.8-beta or later, where this vulnerability is fixed. The fix addresses the missing authentication on the /mcp path by ensuring the nginx front-end applies the auth_request gate properly. No additional mitigation is required if the upgrade is applied.
Description
Presenton versions before 0.8.8-beta include a bundled MCP server that is accessible without authentication on the /mcp path when deployed with session authentication via nginx. This occurs because the nginx front-end does not enforce the auth_request gate on /mcp, allowing remote unauthenticated attackers to invoke MCP tools and perform actions such as generating presentations and consuming configured LLM API keys. The Electron desktop build is not affected as MCP is disabled there. A fix is available in version 0.8.8-beta.
References
- github.com/presenton/presenton/releases/tag/electron-v0.8.8-beta (opens in a new tab)
- github.com/presenton/presenton/issues/678 (opens in a new tab)
- github.com/presenton/presenton/pull/679 (opens in a new tab)
- github.com/presenton/presenton/commit/a1103dcef3c761cc8bab44e2862c81a49969abd7 (opens in a new tab)
- vulncheck.com/advisories/presenton-beta-authentication-bypass-of-session-auth-via-unprotected-mcp-endpoint (opens in a new tab)