Vulnerability-Lookup

CVE-2026-58272 (GCVE-0-2026-58272)

Vulnerability from cvelistv5 – Published: 2026-09-21 20:31 – Updated: 2026-09-23 19:42

Title

Sync-in Server has Username/Login Enumeration via Timing Side-Channel on POST /api/auth/login (incomplete fix of the prior timing-attack advisory)

Summary

Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing. Versions prior to 2.4.1 contain an observable timing discrepancy in the login endpoint because authentication attempts for nonexistent accounts return without performing the bcrypt comparison used for existing accounts. An unauthenticated attacker can measure response times to enumerate valid usernames or email addresses, facilitating credential-stuffing, password-spraying, and phishing attacks. Version 2.4.1 contains a patch.

Severity

5.3 (Medium)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-23 19:41 UTC

CWE

CWE-208 - Observable Timing Discrepancy

Assigner

GitHub_M mitre root Scorecard

References

1 reference

URL	Tags
https://github.com/Sync-in/server/security/adviso…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version	CPE status
Sync-in	server	Affected: < 2.4.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-58272

Vulnerability from fkie_nvd - Published: 2026-09-21 21:17 - Updated: 2026-09-30 17:32

Severity

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/Sync-in/server/security/advisories/GHSA-29hq-23m2-2j47
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/Sync-in/server/security/advisories/GHSA-29hq-23m2-2j47

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-29HQ-23M2-2J47

Vulnerability from github – Published: 2026-09-22 14:49 – Updated: 2026-09-22 14:49

Summary

Sync-in Server has Username/Login Enumeration via Timing Side-Channel on POST /api/auth/login (incomplete fix of the prior timing-attack advisory)

Details

Summary

validateUser() in backend/src/authentication/providers/mysql/auth-provider-mysql.service.ts returns immediately when the supplied login/email does not match any account, without ever calling comparePassword():

async validateUser(loginOrEmail: string, password: string, ip?: string, scope?: AUTH_SCOPE): Promise<UserModel> {
  let user: UserModel
  try {
    user = await this.usersManager.findUser(loginOrEmail, false)
  } catch (e) { ... }
  if (!user) {
    this.logger.warn(...)
    return null   // <-- comparePassword() is never reached here
  }
  return await this.usersManager.logUser(user, password, ip, scope)
}

comparePassword() (backend/src/common/functions.ts) already contains a dummy-hash branch that was clearly added to defend against exactly this class of attack:

export async function comparePassword(password: string, hash?: string | null): Promise<boolean> {
  if (!hash) {
    // No hash, waste time for time-based attacks
    await bcrypt.compare(password, DUMMY_PASSWORD_HASH)
    return false
  }
  return await bcrypt.compare(password, hash)
}

The problem is that this protection only runs when comparePassword() is actually invoked with a falsy hash. Because validateUser() short-circuits with return null as soon as findUser() comes back empty, the "account doesn't exist" path skips all cryptographic work entirely, while the "account exists, wrong password" path always performs a real bcrypt comparison (cost factor 10, ~100ms+). The two outcomes are trivially distinguishable by response time.

There's already a published advisory in this repo for "Username Enumeration via Timing Attack" - this looks like the same underlying issue surfacing through a different call path (the early return in validateUser()) that the existing fix (the dummy-hash branch in comparePassword()) doesn't actually reach, rather than a brand new vulnerability class.

Impact

Any unauthenticated client can determine whether a given username/email is a valid account on the instance by timing POST /api/auth/login: - Non-existent login: near-instant rejection (no bcrypt call). - Existing login (regardless of password correctness): consistently slower due to a real bcrypt comparison.

This enables efficient enumeration of valid accounts, which can then be used to focus credential-stuffing, password-spraying, or phishing against confirmed-valid targets.

Proof of Concept

Verified with the actual comparePassword() logic and the real DUMMY_PASSWORD_HASH constant copied verbatim from backend/src/common/functions.ts, using the project's own bcryptjs dependency (no mocking of bcrypt itself):

Avg time for "login does not exist" path (validateUser returns null, no bcrypt call): 0.00 ms
Avg time for "login exists, wrong password" path (real bcrypt.compare runs):          114.90 ms
Difference: 114.90 ms (ratio: ~58923x)

The "not found" path reproduces validateUser()'s exact early return (no call into comparePassword); the "wrong password" path reproduces logUser()'s real call into comparePassword(password, user.password). The gap is large enough to be trivially observable over a real network, even accounting for jitter.

Reachable endpoint: POST /api/auth/login, guarded only by AuthLocalGuard (Passport local strategy invoking validateUser()), no authentication required.

Suggested fix

Make validateUser() always pass through comparePassword()'s timing-equalized path, even when no user is found, e.g.:

if (!user) {
  await comparePassword(password, null) // burns the same time as a real comparison
  return null
}

so the "account not found" and "account found, wrong password" branches take statistically indistinguishable time.

Severity

5.3 (Medium)


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

Show details on source website

JSON

To clipboard

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  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.4.0"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@sync-in/server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-58272"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-208"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-22T14:49:23Z",
    "nvd_published_at": "2026-09-21T21:17:06Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nvalidateUser() in backend/src/authentication/providers/mysql/auth-provider-mysql.service.ts returns immediately when the supplied login/email does not match any account, without ever calling comparePassword():\n\n    async validateUser(loginOrEmail: string, password: string, ip?: string, scope?: AUTH_SCOPE): Promise\u003cUserModel\u003e {\n      let user: UserModel\n      try {\n        user = await this.usersManager.findUser(loginOrEmail, false)\n      } catch (e) { ... }\n      if (!user) {\n        this.logger.warn(...)\n        return null   // \u003c-- comparePassword() is never reached here\n      }\n      return await this.usersManager.logUser(user, password, ip, scope)\n    }\n\ncomparePassword() (backend/src/common/functions.ts) already contains a dummy-hash branch that was clearly added to defend against exactly this class of attack:\n\n    export async function comparePassword(password: string, hash?: string | null): Promise\u003cboolean\u003e {\n      if (!hash) {\n        // No hash, waste time for time-based attacks\n        await bcrypt.compare(password, DUMMY_PASSWORD_HASH)\n        return false\n      }\n      return await bcrypt.compare(password, hash)\n    }\n\nThe problem is that this protection only runs when comparePassword() is actually invoked with a falsy hash. Because validateUser() short-circuits with return null as soon as findUser() comes back empty, the \"account doesn\u0027t exist\" path skips all cryptographic work entirely, while the \"account exists, wrong password\" path always performs a real bcrypt comparison (cost factor 10, ~100ms+). The two outcomes are trivially distinguishable by response time.\n\nThere\u0027s already a published advisory in this repo for \"Username Enumeration via Timing Attack\" - this looks like the same underlying issue surfacing through a different call path (the early return in validateUser()) that the existing fix (the dummy-hash branch in comparePassword()) doesn\u0027t actually reach, rather than a brand new vulnerability class.\n\n## Impact\n\nAny unauthenticated client can determine whether a given username/email is a valid account on the instance by timing POST /api/auth/login:\n- Non-existent login: near-instant rejection (no bcrypt call).\n- Existing login (regardless of password correctness): consistently slower due to a real bcrypt comparison.\n\nThis enables efficient enumeration of valid accounts, which can then be used to focus credential-stuffing, password-spraying, or phishing against confirmed-valid targets.\n\n## Proof of Concept\n\nVerified with the actual comparePassword() logic and the real DUMMY_PASSWORD_HASH constant copied verbatim from backend/src/common/functions.ts, using the project\u0027s own bcryptjs dependency (no mocking of bcrypt itself):\n\n    Avg time for \"login does not exist\" path (validateUser returns null, no bcrypt call): 0.00 ms\n    Avg time for \"login exists, wrong password\" path (real bcrypt.compare runs):          114.90 ms\n    Difference: 114.90 ms (ratio: ~58923x)\n\nThe \"not found\" path reproduces validateUser()\u0027s exact early return (no call into comparePassword); the \"wrong password\" path reproduces logUser()\u0027s real call into comparePassword(password, user.password). The gap is large enough to be trivially observable over a real network, even accounting for jitter.\n\nReachable endpoint: POST /api/auth/login, guarded only by AuthLocalGuard (Passport local strategy invoking validateUser()), no authentication required.\n\n## Suggested fix\n\nMake validateUser() always pass through comparePassword()\u0027s timing-equalized path, even when no user is found, e.g.:\n\n    if (!user) {\n      await comparePassword(password, null) // burns the same time as a real comparison\n      return null\n    }\n\nso the \"account not found\" and \"account found, wrong password\" branches take statistically indistinguishable time.",
  "id": "GHSA-29hq-23m2-2j47",
  "modified": "2026-09-22T14:49:23Z",
  "published": "2026-09-22T14:49:23Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Sync-in/server/security/advisories/GHSA-29hq-23m2-2j47"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-58272"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Sync-in/server/commit/b80efe04574039a7a302c0e1007f03a7dbe6a633"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Sync-in/server"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Sync-in/server/releases/tag/v2.4.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Sync-in Server has Username/Login Enumeration via Timing Side-Channel on POST /api/auth/login (incomplete fix of the prior timing-attack advisory)"
}

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Action not permitted

CVE-2026-58272 (GCVE-0-2026-58272)

FKIE_CVE-2026-58272

GHSA-29HQ-23M2-2J47

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Suggested fix

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