CVE-2026-27780Network attack vector

Branch-protection bypass via ignored scanner errors

Published Jul 3, 2026 · Updated Jul 3, 2026

Incorrect authorization in Gitea before 1.26.0 allows remote attackers to bypass branch protection with oversized Git push input. The pre-receive hook reads update lines with bufio.Scanner but previously ignored scanner.Err(), so an oversized token silently ended scanning and skipped remaining protection logic. Exploitation requires reaching Git push processing; successful input can admit branch changes that configured protection rules should reject.

CVSS severity9.8
Critical
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Gitea before 1.26.0 allows remote attackers to bypass branch protection with oversized Git push input. The pre-receive hook reads update lines with bufio.Scanner but previously ignored scanner.Err(), so an oversized token silently ended scanning and skipped remaining protection logic. Exploitation requires reaching Git push processing; successful input can admit branch changes that configured protection rules should reject.

The record

CVE
CVE-2026-27780
Published
Jul 3, 2026
Updated
Jul 3, 2026
Vendor
Gitea
Product
Gitea
Classifications
CWE-863, T1190
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 3, 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 <1.26.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Gitea · Giteaversion=0 <1.26.0

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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