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PYSEC-2026-3418
No affected components available
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.
The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the confidentiality of the information.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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