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VulnerabilityPublished Updated

CVE-2026-58446: presenton · Missing Authentication

Affects presentonSource CVE Database V5

0
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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

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (VulnCheck)CVSS 3.16.5
CNA (VulnCheck)CVSS 4.06.9
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:L

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

  1. Disclosed: evidence found.

    CVE published 30 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: evidence found.

    CISA SSVC: proof of concept public

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

Timeline

  1. CVE ID reserved

    by VulnCheck

    , 2 hours before disclosure

  2. CVE published

    on cve.org

    , t = 0

  3. 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

ProductAffectedFixed in
presentonpresentonAffected
  • <0.8.8-beta
Fixed in
  • 0.8.8-beta
GitHubpresentonpkg:github/presentonOther threatsAffected
  • <0.8.8-beta
Fixed in
  • 0.8.8-beta

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

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