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CriticalVulnerabilityCVE-2026-116485updated 26 Oct 2026, 14:21 UTC

danmu_api lets anyone change server settings when default token is used

If this app runs with its default login token and no admin token set, anyone on the internet can change its settings, lock out the real operators, and point the server at other systems.

Fixed in danmu_api 1.21.7 or laterOfficial source
SeverityCriticalCVSS 9.3 of 10
Being exploited?UnclearNo reports either way yet
Fix available?Yesdanmu_api 1.21.7 or later · since 26 Oct 2026
How sure is this?Official sourceBacked by an official source

How the attack works simplified

  1. 1Unauthenticated attackerNo login needed
  2. 2POST to /api/env/setDefault TOKEN accepted
  3. 3Sets ADMIN_TOKENOperators are locked out
  4. 4Changes OTHER_SERVER/PROXY_URLEnables SSRF
  5. 5Triggers redeploymentConfig changes take effect
  6. ResultAttacker controls server configuration

What happened

An authentication bypass in danmu_api allows unauthenticated POST requests to /api/env/set, /api/env/add, and /api/env/del to modify environment configuration when the default TOKEN is in use and ADMIN_TOKEN is unset.

Why it is dangerous: An attacker can take over the server's configuration, lock out administrators, redirect OTHER_SERVER or PROXY_URL to enable server-side request forgery, and trigger redeployment.

Are you affected?

You are affected if you run danmu_api versions before 1.21.7 using the default TOKEN with ADMIN_TOKEN unset.

danmu_api before 1.21.7 (default TOKEN in use, ADMIN_TOKEN unset)

What to do

  1. Update danmu_api to version 1.21.7 or later
  2. Set a strong, unique ADMIN_TOKEN and TOKEN value in the environment
  3. Check the environment configuration for unexpected changes such as a new ADMIN_TOKEN, OTHER_SERVER, or PROXY_URL

Timeline

  1. 26 Oct 2026, 14:16 UTC
    Publicly disclosed
  2. 26 Oct 2026, 14:16 UTC
    Reported by NVD · NVD
  3. 26 Oct 2026, 14:21 UTC
    Picked up by Zero Radar

Sources 1 report, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-116485
CVSS
9.3 / 10
EPSS
2.3% chance of exploitation within 30 days
Disclosed
26 Oct 2026, 14:16 UTC
On Zero Radar
26 Oct 2026, 14:21 UTC (4 min after disclosure)
Last change
26 Oct 2026, 14:21 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

danmu_api lets anyone change server settings when default token is used · Zero Radar