CVE-2026-58428Public exploitNetwork attack vectorHinoki check available

Authenticated forbidden file distribution via unchecked attachment rename

Published Aug 13, 2026 · Updated Aug 13, 2026

File-type restriction bypass in Gitea 1.26.4 and earlier allows remote authenticated users to serve forbidden release attachments. EditReleasePost passes attacker-controlled attachment-edit names to UpdateRelease, which writes them with UpdateAttachmentByUUID without calling upload.Verify against Repository.Release.AllowedTypes. Repository write permission and a configured nonempty allowlist are required; the renamed file is served under the prohibited extension.

CVSS severity6.5
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

File-type restriction bypass in Gitea 1.26.4 and earlier allows remote authenticated users to serve forbidden release attachments. EditReleasePost passes attacker-controlled attachment-edit names to UpdateRelease, which writes them with UpdateAttachmentByUUID without calling upload.Verify against Repository.Release.AllowedTypes. Repository write permission and a configured nonempty allowlist are required; the renamed file is served under the prohibited extension.

The record

CVE
CVE-2026-58428
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Gitea
Product
Gitea
Classifications
CWE-424, CWE-434, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 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 <=1.26.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Gitea · Giteaversion=0 <=1.26.4

Published CVSS scores

6.5CISA ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
6.5GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

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-424Improper Protection of Alternate Path
CWE-434Unrestricted Upload of File with Dangerous Type
T1565.001Stored Data Manipulation

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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