CVE-2026-58426Public exploitNetwork attack vector

Artifact disclosure and staging write via HMAC ambiguity

Published Jul 3, 2026 · Updated Jul 3, 2026

Authorization bypass in Gitea Actions Artifacts V4 1.22.0 through 1.26.1 allows remote authenticated users to read or write artifacts. The signed-URL builder concatenates endpoint, expiry, artifact name, task ID, and artifact ID without boundaries, while verification trusts rewritten task and name fields instead of binding the signed artifact ID. Actions-job permission and a running target task are required; forged URLs expose cross-repository artifacts or alter another task's upload staging data and metadata.

CVSS severity9.6
Critical
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Gitea Actions Artifacts V4 1.22.0 through 1.26.1 allows remote authenticated users to read or write artifacts. The signed-URL builder concatenates endpoint, expiry, artifact name, task ID, and artifact ID without boundaries, while verification trusts rewritten task and name fields instead of binding the signed artifact ID. Actions-job permission and a running target task are required; forged URLs expose cross-repository artifacts or alter another task's upload staging data and metadata.

The record

CVE
CVE-2026-58426
Published
Jul 3, 2026
Updated
Jul 3, 2026
Vendor
Gitea
Product
Gitea
Classifications
CWE-347, T1213
Attack vector
network
Privileges
authenticated

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=1.22.0 <=1.26.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Gitea · Giteaversion=1.22.0 <=1.26.1

Published CVSS scores

9.6Gitea LimitedCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
T1213Data from Information 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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