Vulnerability-Lookup

CVE-2026-22253 (GCVE-0-2026-22253)

Vulnerability from cvelistv5 – Published: 2026-01-08 18:39 – Updated: 2026-01-08 18:51

Title

Soft Serve is missing an authorization check in LFS lock deletion

Summary

Soft Serve is a self-hostable Git server for the command line. Prior to version 0.11.2, an authorization bypass in the LFS lock deletion endpoint allows any authenticated user with repository write access to delete locks owned by other users by setting the force flag. The vulnerable code path processes force deletions before retrieving user context, bypassing ownership validation entirely. This issue has been patched in version 0.11.2.

Severity ?

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

CWE

CWE-863 - Incorrect Authorization

Assigner

GitHub_M

References

URL

Tags

	https://github.com/charmbracelet/soft-serve/secur…	x_refsource_CONFIRM
	https://github.com/charmbracelet/soft-serve/commi…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	charmbracelet	soft-serve	Affected: < 0.11.2

Show details on NVD website

JSON

To clipboard

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GHSA-6JM8-X3G6-R33J

Vulnerability from github – Published: 2026-01-08 21:01 – Updated: 2026-01-08 21:37

Summary

Soft Serve is missing an authorization check in LFS lock deletion

Details

LFS Lock Force-Delete Authorization Bypass

Summary

An authorization bypass in the LFS lock deletion endpoint allows any authenticated user with repository write access to delete locks owned by other users by setting the force flag. The vulnerable code path processes force deletions before retrieving user context, bypassing ownership validation entirely.

Severity

CWE-863: Incorrect Authorization
CVSS 3.1: 5.4 (Medium) — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

Affected Code

File: pkg/web/git_lfs.go Function: serviceLfsLocksDelete (lines 831–945) Endpoint: POST /<repo>.git/info/lfs/locks/:lockID/unlock

The control flow processes req.Force at line 905 before retrieving user context at line 919:

// Line 905-916: Force delete executes immediately without authorization
if req.Force {
    if err := datastore.DeleteLFSLock(ctx, dbx, repo.ID(), lockID); err != nil {
        // ...
    }
    renderJSON(w, http.StatusOK, l)
    return  // Returns here, never reaching user validation
}

// Line 919: User context retrieved after force path has exited
user := proto.UserFromContext(ctx)

Proof of Concept

Setup: Two users with write access to the same repository—User A (lock owner) and User B (attacker).

User A creates a lock: bash curl -X POST http://localhost:23232/repo.git/info/lfs/locks \ -H "Authorization: Basic <user_a_token>" \ -H "Content-Type: application/vnd.git-lfs+json" \ -d '{"path": "protected-file.bin"}'
User B deletes User A's lock using force flag: bash curl -X POST http://localhost:23232/repo.git/info/lfs/locks/1/unlock \ -H "Authorization: Basic <user_b_token>" \ -H "Content-Type: application/vnd.git-lfs+json" \ -d '{"force": true}'
Result: Lock deleted successfully with 200 OK. Expected: 403 Forbidden.

Suggested Fix

Retrieve user context and validate authorization before processing the force flag:

user := proto.UserFromContext(ctx)
if user == nil {
    renderJSON(w, http.StatusUnauthorized, lfs.ErrorResponse{
        Message: "unauthorized",
    })
    return
}

if req.Force {
    if !user.IsAdmin() {
        renderJSON(w, http.StatusForbidden, lfs.ErrorResponse{
            Message: "admin access required for force delete",
        })
        return
    }
    if err := datastore.DeleteLFSLock(ctx, dbx, repo.ID(), lockID); err != nil {
        // ...
    }
    renderJSON(w, http.StatusOK, l)
    return
}

Impact

Affected Deployments: Soft Serve instances with LFS enabled and repositories with multiple collaborators.

Exploitation Requirements: - Authenticated session - Write access to target repository

Consequences: - Unauthorized deletion of other users' locks - Bypass of LFS file coordination mechanisms - Potential workflow disruption in collaborative environments

Limitations: Does not grant file access, escalate repository permissions, or affect repositories where the attacker lacks write access.

Severity ?

5.4 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/charmbracelet/soft-serve"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.11.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-22253"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-08T21:01:54Z",
    "nvd_published_at": "2026-01-08T19:15:59Z",
    "severity": "MODERATE"
  },
  "details": "## LFS Lock Force-Delete Authorization Bypass\n\n### Summary\n\nAn authorization bypass in the LFS lock deletion endpoint allows any authenticated user with repository write access to delete locks owned by other users by setting the `force` flag. The vulnerable code path processes force deletions before retrieving user context, bypassing ownership validation entirely.\n\n### Severity\n\n- **CWE-863:** Incorrect Authorization\n- **CVSS 3.1:** 5.4 (Medium) \u2014 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L`\n\n### Affected Code\n\n**File:** `pkg/web/git_lfs.go`\n**Function:** `serviceLfsLocksDelete` (lines 831\u2013945)\n**Endpoint:** `POST /\u003crepo\u003e.git/info/lfs/locks/:lockID/unlock`\n\nThe control flow processes `req.Force` at line 905 before retrieving user context at line 919:\n\n```go\n// Line 905-916: Force delete executes immediately without authorization\nif req.Force {\n    if err := datastore.DeleteLFSLock(ctx, dbx, repo.ID(), lockID); err != nil {\n        // ...\n    }\n    renderJSON(w, http.StatusOK, l)\n    return  // Returns here, never reaching user validation\n}\n\n// Line 919: User context retrieved after force path has exited\nuser := proto.UserFromContext(ctx)\n```\n\n### Proof of Concept\n\n**Setup:** Two users with write access to the same repository\u2014User A (lock owner) and User B (attacker).\n\n1. **User A creates a lock:**\n   ```bash\n   curl -X POST http://localhost:23232/repo.git/info/lfs/locks \\\n     -H \"Authorization: Basic \u003cuser_a_token\u003e\" \\\n     -H \"Content-Type: application/vnd.git-lfs+json\" \\\n     -d \u0027{\"path\": \"protected-file.bin\"}\u0027\n   ```\n\n2. **User B deletes User A\u0027s lock using force flag:**\n   ```bash\n   curl -X POST http://localhost:23232/repo.git/info/lfs/locks/1/unlock \\\n     -H \"Authorization: Basic \u003cuser_b_token\u003e\" \\\n     -H \"Content-Type: application/vnd.git-lfs+json\" \\\n     -d \u0027{\"force\": true}\u0027\n   ```\n\n3. **Result:** Lock deleted successfully with `200 OK`. Expected: `403 Forbidden`.\n\n### Suggested Fix\n\nRetrieve user context and validate authorization before processing the force flag:\n\n```go\nuser := proto.UserFromContext(ctx)\nif user == nil {\n    renderJSON(w, http.StatusUnauthorized, lfs.ErrorResponse{\n        Message: \"unauthorized\",\n    })\n    return\n}\n\nif req.Force {\n    if !user.IsAdmin() {\n        renderJSON(w, http.StatusForbidden, lfs.ErrorResponse{\n            Message: \"admin access required for force delete\",\n        })\n        return\n    }\n    if err := datastore.DeleteLFSLock(ctx, dbx, repo.ID(), lockID); err != nil {\n        // ...\n    }\n    renderJSON(w, http.StatusOK, l)\n    return\n}\n```\n\n### Impact\n\n**Affected Deployments:** Soft Serve instances with LFS enabled and repositories with multiple collaborators.\n\n**Exploitation Requirements:**\n- Authenticated session\n- Write access to target repository\n\n**Consequences:**\n- Unauthorized deletion of other users\u0027 locks\n- Bypass of LFS file coordination mechanisms\n- Potential workflow disruption in collaborative environments\n\n**Limitations:** Does not grant file access, escalate repository permissions, or affect repositories where the attacker lacks write access.",
  "id": "GHSA-6jm8-x3g6-r33j",
  "modified": "2026-01-08T21:37:08Z",
  "published": "2026-01-08T21:01:54Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/charmbracelet/soft-serve/security/advisories/GHSA-6jm8-x3g6-r33j"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-22253"
    },
    {
      "type": "WEB",
      "url": "https://github.com/charmbracelet/soft-serve/commit/000ab5164f0be68cf1ea6b6e7227f11c0e388a42"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/charmbracelet/soft-serve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Soft Serve is missing an authorization check in LFS lock deletion"
}

FKIE_CVE-2026-22253

Vulnerability from fkie_nvd - Published: 2026-01-08 19:15 - Updated: 2026-01-08 19:15

Severity ?

5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/charmbracelet/soft-serve/commit/000ab5164f0be68cf1ea6b6e7227f11c0e388a42
	security-advisories@github.com	https://github.com/charmbracelet/soft-serve/security/advisories/GHSA-6jm8-x3g6-r33j

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Soft Serve is a self-hostable Git server for the command line. Prior to version 0.11.2, an authorization bypass in the LFS lock deletion endpoint allows any authenticated user with repository write access to delete locks owned by other users by setting the force flag. The vulnerable code path processes force deletions before retrieving user context, bypassing ownership validation entirely. This issue has been patched in version 0.11.2."
    }
  ],
  "id": "CVE-2026-22253",
  "lastModified": "2026-01-08T19:15:59.950",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.5,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-01-08T19:15:59.950",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/charmbracelet/soft-serve/commit/000ab5164f0be68cf1ea6b6e7227f11c0e388a42"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/charmbracelet/soft-serve/security/advisories/GHSA-6jm8-x3g6-r33j"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-22253 (GCVE-0-2026-22253)

GHSA-6JM8-X3G6-R33J

LFS Lock Force-Delete Authorization Bypass

Summary

Severity

Affected Code

Proof of Concept

Suggested Fix

Impact

FKIE_CVE-2026-22253

Tags

Sightings

Nomenclature