Vulnerability-Lookup

CVE-2026-27838 (GCVE-0-2026-27838)

Vulnerability from cvelistv5 – Published: 2026-02-26 22:04 – Updated: 2026-03-03 01:37

Title

wger: IDOR via user-unscoped cache keys on routine API actions exposes workout data

Summary

wger is a free, open-source workout and fitness manager. Five routine detail action endpoints check a cache before calling `self.get_object()`. In versions up to and including 2.4, ache keys are scoped only by `pk` — no user ID is included. When a victim has previously accessed their routine via the API, an attacker can retrieve the cached response for the same PK without any ownership check. Commit e964328784e2ee2830a1991d69fadbce86ac9fbf contains a patch for the issue.

Severity ?

3.1 (Low)


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

CWE

CWE-639 - Authorization Bypass Through User-Controlled Key

Assigner

GitHub_M

References

URL

Tags

	https://github.com/wger-project/wger/security/adv…	x_refsource_CONFIRM
	https://github.com/wger-project/wger/commit/e9643…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	wger-project	wger	Affected: <= 2.4

Show details on NVD website

JSON

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FKIE_CVE-2026-27838

Vulnerability from fkie_nvd - Published: 2026-02-26 23:16 - Updated: 2026-03-03 00:50

Severity ?

3.1 (Low) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
3.5 (Low) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/wger-project/wger/commit/e964328784e2ee2830a1991d69fadbce86ac9fbf	Patch
	security-advisories@github.com	https://github.com/wger-project/wger/security/advisories/GHSA-42cr-w2gr-m54q	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	wger	wger	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:wger:wger:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "069E9B5B-A461-47CB-90EA-9A0F99C25C77",
              "versionEndIncluding": "2.4",
              "vulnerable": true
            }
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      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "wger is a free, open-source workout and fitness manager. Five routine detail action endpoints check a cache before calling `self.get_object()`. In versions up to and including 2.4, ache keys are scoped only by `pk` \u2014 no user ID is included. When a victim has previously accessed their routine via the API, an attacker can retrieve the cached response for the same PK without any ownership check. Commit e964328784e2ee2830a1991d69fadbce86ac9fbf contains a patch for the issue."
    },
    {
      "lang": "es",
      "value": "wger es un gestor de entrenamientos y fitness gratuito y de c\u00f3digo abierto. Cinco endpoints de acci\u00f3n de detalle de rutina verifican una cach\u00e9 antes de llamar a `self.get_object()`. En versiones hasta la 2.4 inclusive, las claves de cach\u00e9 se limitan solo por `pk` \u2014 no se incluye ning\u00fan ID de usuario. Cuando una v\u00edctima ha accedido previamente a su rutina a trav\u00e9s de la API, un atacante puede recuperar la respuesta en cach\u00e9 para el mismo PK sin ninguna verificaci\u00f3n de propiedad. El commit e964328784e2ee2830a1991d69fadbce86ac9fbf contiene un parche para el problema."
    }
  ],
  "id": "CVE-2026-27838",
  "lastModified": "2026-03-03T00:50:54.890",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 3.1,
          "baseSeverity": "LOW",
          "confidentialityImpact": "LOW",
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          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
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        "source": "security-advisories@github.com",
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}

GHSA-42CR-W2GR-M54Q

Vulnerability from github – Published: 2026-02-26 22:15 – Updated: 2026-02-27 21:59

Summary

wger: IDOR via user-unscoped cache keys on routine API actions exposes workout data

Details

Summary

Five routine detail action endpoints check a cache before calling self.get_object(). Cache keys are scoped only by pk — no user ID is included. When a victim has previously accessed their routine via the API, an attacker can retrieve the cached response for the same PK without any ownership check.

Details

wger/manager/api/views.py — five actions follow this pattern (lines 134–201):

@action(detail=True)
def date_sequence_display_mode(self, request, pk=None):
    cache_key = make_routine_api_date_sequence_display_cache_key(pk)
    cached = cache.get(cache_key)
    if cached:
        return Response(cached)   # returned WITHOUT calling self.get_object()
    # only reaches ownership check on cache miss
    routine = self.get_object()
    ...

Cache key construction in wger/utils/cache.py:89–106:

def make_routine_api_date_sequence_display_cache_key(routine_id):
    return f"routine-api-date-sequence-display-{routine_id}"
    # No user ID in key

Cache TTL: 1 month (4 * 604800 seconds, settings_global.py:461).

Affected endpoints:

GET /api/v2/routine/{pk}/date-sequence-display/
GET /api/v2/routine/{pk}/date-sequence-gym/
GET /api/v2/routine/{pk}/structure/
GET /api/v2/routine/{pk}/logs/
GET /api/v2/routine/{pk}/stats/

PoC

1. Victim (user A) visits GET /api/v2/routine/5/structure/ → response cached under key "routine-api-structure-5"
2. Attacker (user B) visits GET /api/v2/routine/5/structure/ → cache hit → returns user A's routine structure without any ownership check

Requires the victim to have previously accessed the endpoint (cache must be populated). Once populated, the cache entry is valid for 1 month.

Impact

An attacker with a registered account can retrieve another user's routine details — workout day sequences, exercise structure, training logs, and statistics — from cache without ownership verification.

Fix: Include the user ID in the cache key:

def make_routine_api_date_sequence_display_cache_key(routine_id, user_id):
    return f"routine-api-date-sequence-display-{user_id}-{routine_id}"

Or move self.get_object() before the cache lookup so ownership is always verified first.

Severity ?

3.1 (Low)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "wger"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-27838"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-639"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-26T22:15:30Z",
    "nvd_published_at": "2026-02-26T23:16:34Z",
    "severity": "LOW"
  },
  "details": "### Summary\n\nFive routine detail action endpoints check a cache before calling `self.get_object()`. Cache keys are scoped only by `pk` \u2014 no user ID is included. When a victim has previously accessed their routine via the API, an attacker can retrieve the cached response for the same PK without any ownership check.\n\n### Details\n\n`wger/manager/api/views.py` \u2014 five actions follow this pattern (lines 134\u2013201):\n\n```python\n@action(detail=True)\ndef date_sequence_display_mode(self, request, pk=None):\n    cache_key = make_routine_api_date_sequence_display_cache_key(pk)\n    cached = cache.get(cache_key)\n    if cached:\n        return Response(cached)   # returned WITHOUT calling self.get_object()\n    # only reaches ownership check on cache miss\n    routine = self.get_object()\n    ...\n```\n\nCache key construction in `wger/utils/cache.py:89\u2013106`:\n\n```python\ndef make_routine_api_date_sequence_display_cache_key(routine_id):\n    return f\"routine-api-date-sequence-display-{routine_id}\"\n    # No user ID in key\n```\n\nCache TTL: 1 month (`4 * 604800` seconds, `settings_global.py:461`).\n\nAffected endpoints:\n```\nGET /api/v2/routine/{pk}/date-sequence-display/\nGET /api/v2/routine/{pk}/date-sequence-gym/\nGET /api/v2/routine/{pk}/structure/\nGET /api/v2/routine/{pk}/logs/\nGET /api/v2/routine/{pk}/stats/\n```\n\n### PoC\n\n```\n1. Victim (user A) visits GET /api/v2/routine/5/structure/ \u2192 response cached under key \"routine-api-structure-5\"\n2. Attacker (user B) visits GET /api/v2/routine/5/structure/ \u2192 cache hit \u2192 returns user A\u0027s routine structure without any ownership check\n```\n\nRequires the victim to have previously accessed the endpoint (cache must be populated). Once populated, the cache entry is valid for 1 month.\n\n### Impact\n\nAn attacker with a registered account can retrieve another user\u0027s routine details \u2014 workout day sequences, exercise structure, training logs, and statistics \u2014 from cache without ownership verification.\n\n**Fix**: Include the user ID in the cache key:\n```python\ndef make_routine_api_date_sequence_display_cache_key(routine_id, user_id):\n    return f\"routine-api-date-sequence-display-{user_id}-{routine_id}\"\n```\n\nOr move `self.get_object()` before the cache lookup so ownership is always verified first.",
  "id": "GHSA-42cr-w2gr-m54q",
  "modified": "2026-02-27T21:59:39Z",
  "published": "2026-02-26T22:15:30Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/wger-project/wger/security/advisories/GHSA-42cr-w2gr-m54q"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27838"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wger-project/wger/commit/e964328784e2ee2830a1991d69fadbce86ac9fbf"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/wger-project/wger"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "wger: IDOR via user-unscoped cache keys on routine API actions exposes workout data"
}

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-2026-27838 (GCVE-0-2026-27838)

FKIE_CVE-2026-27838

GHSA-42CR-W2GR-M54Q

Summary

Details

PoC

Impact

Tags

Sightings

Nomenclature