VulnerabilityPublished 7 Oct 2026Updated 26 Oct 2026

CVE-2026-43976: wger · cross-tenant admin notes/contracts leak via gym=None bypass (5 views)

Affects wgerSource GCVE Database

Authoritative record:CVE-2026-43976· High 7.1

Not known to be exploited · CVSS 7.1 High.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score

7.1High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 7 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
PyPIwger	Affected <=2.1	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available that corrects the gym-scope guard to explicitly check for None gym IDs and deny access if the trainer's gym is None or does not match the member's gym. Additionally, querysets must be tightened with secondary filters scoped to the trainer's gym to prevent unauthorized data disclosure. The vendor or maintainers should extract a shared helper function to enforce consistent gym-scoping checks across all affected views. Until patched, restrict permissions for users with gym=None or avoid assigning gym=None to trainers with sensitive permissions.

Description

wger contains an access control vulnerability affecting five gym management views where a gym-scope guard fails when both the requesting trainer and target user have no gym assigned (gym=None). This flaw allows an authenticated trainer with specific permissions and no gym assignment to access private admin notes, documents, contracts, user configurations, and permissions of any other unaffiliated user with gym=None. The root cause is a comparison that incorrectly allows access when both gym values are None, combined with querysets that lack secondary gym-scoped filtering.

Impact

An authenticated trainer with gym.gym_trainer and gym.add_adminusernote permissions and no gym assignment can access sensitive personal and administrative data of any other user without a gym assignment. This includes private admin notes (potentially containing salary, medical, and disciplinary information), uploaded documents (contracts, ID scans, medical forms), gym contracts, user configuration, and user permissions. This leads to a confidentiality breach of potentially sensitive personally identifiable information (PII) and administrative data.

Summary

The vulnerability in wger arises from a flawed gym-scope guard implemented as a comparison between the trainer's and user's gym attributes. When both are None, the guard incorrectly permits access. This affects five views: admin notes list, documents list, contracts list, user config, and permissions edit. An attacker with gym.gym_trainer and gym.add_adminusernote permissions and gym=None can enumerate and read sensitive data of any other gym=None user, including private notes, documents, contracts, and user permissions. The vulnerability is reproducible on the latest wger Docker image and is caused by missing gym-scoped filtering in querysets and an improper gym comparison that does not block access when both gyms are None. A patch involves explicitly checking for None gym IDs and adding gym-scoped filters to querysets.

CWE-863Incorrect Authorization (opens in a new tab)
Class weaknessLikelihood of exploit: HighCWE Top 25 (2025): #17OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
Architecture and Design
Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) to enforce the roles at the appropriate boundaries.
Architecture and Design
Ensure that access control checks are performed related to the business logic. These checks may be different than the access control checks that are applied to more generic resources such as files, connections, processes, memory, and database records.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
OWASP Cheat Sheets
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V8.3.8 (opens in a new tab)
V13.4.2 (opens in a new tab)
V7.2.2 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 16:36 UTC

WeaknessesCWE-863

Technical details

References

Community reviews

Related threats