CVE-2026-16076Public exploitNetwork attack vector

Administrator impersonation via caller-controlled username

Published Jul 18, 2026 · Updated Jul 18, 2026

Authentication bypass in AstrBot 4.25.0 through 4.25.5 allows remote authenticated users to execute administrator-only commands. OpenApiRoute.chat_send replaces the API-key principal in g.username with the request body's username, and downstream authorization trusts that sender identifier. A valid chat-scope API key is required; an administrator ID grants that identity, with the published proof of concept persisting a forged alias through the admin-only /name command.

CVSS severity6.3
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in AstrBot 4.25.0 through 4.25.5 allows remote authenticated users to execute administrator-only commands. OpenApiRoute.chat_send replaces the API-key principal in g.username with the request body's username, and downstream authorization trusts that sender identifier. A valid chat-scope API key is required; an administrator ID grants that identity, with the published proof of concept persisting a forged alias through the admin-only /name command.

The record

CVE
CVE-2026-16076
Published
Jul 18, 2026
Updated
Jul 18, 2026
Vendor
AstrBotDevs
Product
AstrBot
Classifications
CWE-290, CWE-287, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.25.0
  2. Affected versionversion=4.25.1
  3. Affected versionversion=4.25.2
  4. Affected versionversion=4.25.3
  5. Affected versionversion=4.25.4
  6. Affected versionversion=4.25.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

AstrBotDevs · AstrBotversion=4.25.0; version=4.25.1; version=4.25.2; version=4.25.3; version=4.25.4; version=4.25.5

Published CVSS scores

5.3VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
6.5CISA-ADPAV:N/AC:L/Au:S/C:P/I:P/A:P
6.5VulDB CNAAV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR
6.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
6.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
6.3VulDB CNACVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing
CWE-287Improper Authentication
T1078Valid Accounts

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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