CVE-2026-57886Public exploitNetwork attack vector

Private attachment disclosure via unchecked UUID re-linking

Published Aug 13, 2026 · Updated Aug 13, 2026

Missing authorization in Gitea 1.26.4 and earlier allows remote authenticated users to disclose private attachments using known UUIDs. UpdateIssueAttachments and UpdateCommentAttachments load attacker-supplied attachment UUIDs and rewrite issue or comment links without confirming repository ownership. Exploitation requires an account able to edit an issue or comment and prior knowledge of a victim attachment UUID; it exposes the file and changes its logical association without affecting service availability.

CVSS severity5.9
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Gitea 1.26.4 and earlier allows remote authenticated users to disclose private attachments using known UUIDs. UpdateIssueAttachments and UpdateCommentAttachments load attacker-supplied attachment UUIDs and rewrite issue or comment links without confirming repository ownership. Exploitation requires an account able to edit an issue or comment and prior knowledge of a victim attachment UUID; it exposes the file and changes its logical association without affecting service availability.

The record

CVE
CVE-2026-57886
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Gitea
Product
Gitea
Classifications
CWE-862, CWE-639, T1213.003
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

5.9GitHubCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/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-862Missing Authorization
CWE-639Authorization Bypass Through User-Controlled Key
T1213.003Code Repositories

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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