CVE-2026-58427: Gitea Private Org Member List Leaked Vulnerability

MODERATE
Advisory Identifier: GHSA-prr9-9mp4-5gp2
Share
CWE-200 CWE-863
Published
Advisory Summary

CVE-2026-58427 is a MODERATE private org member list leaked vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Gitea libraries in the Go ecosystem. The issue involves private org member list leaked via /members api endpoint — incomplete fix for pr #38145. Remediation is available by upgrading affected packages to version 1.27.0.

CVE-2026-58427 at a Glance

CVE Identifier CVE-2026-58427
GHSA Identifier GHSA-prr9-9mp4-5gp2
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Gitea
Package Ecosystem Go
Published Date
Last Updated

How to Fix CVE-2026-58427

To remediate this vulnerability, upgrade all affected Gitea dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

gitea.dev fixed: 1.27.0 
Upgrade gitea.dev to 1.27.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for gitea.dev

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-58427, inspect your project dependencies for Gitea:

inspect dependencies for gitea.dev

Analyze the terminal output to locate any version of Gitea in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.27.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor, where the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. In Gitea, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## Summary PR #38145 fixed ListPublicMembers and IsPublicMember but missed ListMembers. Any authenticated user can enumerate ALL members (not just public ones) of a private organization. ## Affected Versions <= v1.26.4 (latest) and main branch ## Root Cause routers/api/v1/org/member.go — ListMembers(): // Missing check: if !organization.HasOrgOrUserVisible(ctx, ctx.Org.Organization.AsUser(), ctx.Doer) { ctx.APIErrorNotFound() return } ## Proof of Concept # Setup: privateorg (private), alice = member, bob = outsider # Bob lists ALL members of private org curl -s "http://gitea/api/v1/orgs/privateorg/members" \ -H "Authorization: token BOB_TOKEN" # Result: HTTP 200 [{"login":"alice","email":"alice@test.com",...}] # Expected: HTTP 404 ## Note This is an incomplete fix variant of PR #38145. That PR fixed public_members endpoints only. ListMembers (/orgs/{org}/members) remains unpatched. ## Fix Add to ListMembers(): if !organization.HasOrgOrUserVisible(ctx, ctx.Org.Organization.AsUser(), ctx.Doer) { ctx.APIErrorNotFound() return }

CVE-2026-58427 Affected Gitea Versions

1 component(s)
Fixed Versions:
1.27.0
Product / Package Ecosystem Affected Versions Fixed Version
gitea.dev
golang/gitea.dev
Go
< 1.27.0
1.27.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/go-gitea/gitea/security/advisories/GHSA-prr9-9mp4-5gp2
Gitea Source Repository REPOSITORY
https://github.com/go-gitea/gitea
Gitea Release RELEASE
https://github.com/go-gitea/gitea/releases/tag/v1.27.0

Frequently Asked Questions

What is CVE-2026-58427?
CVE-2026-58427 is a security vulnerability in Gitea involving Private org member list leaked via /members API endpoint — incomplete fix for PR #38145 under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Gitea versions are affected?
Affected versions include releases prior to 1.27.0 across affected packages: gitea.dev.
What version fixes CVE-2026-58427?
Upgrading to 1.27.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is gitea.dev affected?
Yes, gitea.dev is affected in releases prior to 1.27.0. Upgrade your dependency to 1.27.0 or later.
What CWE is associated with CVE-2026-58427?
CVE-2026-58427 is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.).
How can I check Go dependencies for CVE-2026-58427?
Run the dependency tree command: 'inspect dependencies for gitea.dev'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-prr9-9mp4-5gp2",
  "modified" : "2026-07-21T21:49:00Z",
  "published" : "2026-07-21T21:49:00Z",
  "aliases" : [ "CVE-2026-58427" ],
  "summary" : "Gitea: Private org member list leaked via /members API endpoint — incomplete fix for PR #38145",
  "details" : "## Summary\nPR #38145 fixed ListPublicMembers and IsPublicMember but missed \nListMembers. Any authenticated user can enumerate ALL members \n(not just public ones) of a private organization.\n\n## Affected Versions\n<= v1.26.4 (latest) and main branch\n\n## Root Cause\nrouters/api/v1/org/member.go — ListMembers():\n\n// Missing check:\nif !organization.HasOrgOrUserVisible(ctx, \n    ctx.Org.Organization.AsUser(), ctx.Doer) {\n    ctx.APIErrorNotFound()\n    return\n}\n\n## Proof of Concept\n\n# Setup: privateorg (private), alice = member, bob = outsider\n\n# Bob lists ALL members of private org\ncurl -s \"http://gitea/api/v1/orgs/privateorg/members\" \\\n  -H \"Authorization: token BOB_TOKEN\"\n\n# Result: HTTP 200\n[{\"login\":\"alice\",\"email\":\"alice@test.com\",...}]\n# Expected: HTTP 404\n\n## Note\nThis is an incomplete fix variant of PR #38145.\nThat PR fixed public_members endpoints only.\nListMembers (/orgs/{org}/members) remains unpatched.\n\n## Fix\nAdd to ListMembers():\nif !organization.HasOrgOrUserVisible(ctx, \n    ctx.Org.Organization.AsUser(), ctx.Doer) {\n    ctx.APIErrorNotFound()\n    return\n}",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "gitea.dev"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.27.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/security/advisories/GHSA-prr9-9mp4-5gp2"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/go-gitea/gitea"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/releases/tag/v1.27.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200", "CWE-863" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-21T21:49:00Z",
    "nvd_published_at" : null
  }
}