CVE-2026-25119Public exploitNetwork attack vector

Authentication bypass via untrusted reverse-proxy header

Published Jun 24, 2026 · Updated Jun 24, 2026

Authentication bypass in Gogs before 0.14.3 allows remote attackers to impersonate users through a forged reverse-proxy header. The authenticatedUser function reads the configured HTTP header from every request and treats its value as an authenticated username without checking the immediate peer. Exploitation requires ENABLE_REVERSE_PROXY_AUTHENTICATION and direct network reachability; auto-registration also lets a forged unknown username create an activated account.

CVSS severityUnavailable
Unscored
EPSS probability0.86%
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 Gogs before 0.14.3 allows remote attackers to impersonate users through a forged reverse-proxy header. The authenticatedUser function reads the configured HTTP header from every request and treats its value as an authenticated username without checking the immediate peer. Exploitation requires ENABLE_REVERSE_PROXY_AUTHENTICATION and direct network reachability; auto-registration also lets a forged unknown username create an activated account.

The record

CVE
CVE-2026-25119
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
Gogs
Product
Gogs
Classifications
CWE-290, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=< 0.14.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Gogs · Gogsversion=< 0.14.3

Published CVSS scores

7.7GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P

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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing
T1190Exploit Public-Facing Application

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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