CVE-2026-27779Network attack vector

Canonical URL spoofing via unvalidated forwarded-proto headers

Published Jul 3, 2026 · Updated Jul 3, 2026

Improper access control in Gitea before 1.25.5 allows remote attackers to spoof canonical URLs via crafted forwarded-proto headers. The public-URL detection path in modules/httplib/url.go accepts X-Forwarded-Proto and related values without restricting the scheme to one http or https token. An unauthenticated network request must reach forwarded-header processing, after which generated public URLs can carry an attacker-controlled scheme; no data access or code execution is reported.

CVSS severity7.5
High
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Gitea before 1.25.5 allows remote attackers to spoof canonical URLs via crafted forwarded-proto headers. The public-URL detection path in modules/httplib/url.go accepts X-Forwarded-Proto and related values without restricting the scheme to one http or https token. An unauthenticated network request must reach forwarded-header processing, after which generated public URLs can carry an attacker-controlled scheme; no data access or code execution is reported.

The record

CVE
CVE-2026-27779
Published
Jul 3, 2026
Updated
Jul 3, 2026
Vendor
Gitea
Product
Gitea
Classifications
CWE-284
Attack vector
network
Privileges
unauthenticated

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 <1.25.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Gitea · Giteaversion=0 <1.25.5

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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