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GHSA-wppc-7cq7-cgfv CVE-2026-27457 PYSEC-2026-2310

Weblate: Missing access control for the AddonViewSet API exposes all addon configurations

Medium PyPI
Severity
4.3 / 10
Medium · CVSS 3.1
Exploit chance (EPSS)
0.35%
Chance of exploitation in the next 30 days. Higher than 28.43% of scored vulnerabilities.
Known exploited
No
Not in CISA's catalog
Weakness
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-862 Missing Authorization
Fix
5.16.1
Upgrade weblate to this version or later

Description

Impact

Users were able to obtain add-on configuration via API.

Patches

References

Weblate thanks @lighthousekeeper1212 for responsible disclosure.

Affected versions

PyPI

PackageVulnerableFixed in
weblate
< 5.16.1
5.16.1

How to fix

Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.

weblate PyPI → 5.16.1

pip
pip install --upgrade "weblate>=5.16.1"
poetry
poetry add "weblate>=5.16.1"
uv
uv add "weblate>=5.16.1"

Severity breakdown

CVSS 3.1 4.3

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

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Weakness

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

How to prevent it
  • Architecture and Design: Compartmentalize the system to have "safe" areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area. Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.

CWE-862: Missing Authorization

The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

How to prevent it
  • 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) [REF-229] to enforce the roles at the appropriate boundaries. Note that this approach may not protect against horizontal authorization, i.e., it will not protect a user from attacking others with the same role.
  • 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. For example, a database may restrict access for medical records to a specific database user, but each record might only be intended to be accessible to the patient and the patient's doctor [REF-7].
  • Architecture and Design: Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, consider using authorization frameworks such as the JAAS Authorization Framework [REF-233] and the OWASP ESAPI Access Control feature [REF-45].
  • Architecture and Design: For web applications, make sure that the access control mechanism is enforced correctly at the server side on every page. Users should not be able to access any unauthorized functionality or information by simply requesting direct access to that page. One way to do this is to ensure that all pages containing sensitive information are not cached, and that all such pages restrict access to requests that are accompanied by an active and authenticated session token associated with a user who has the required permissions to access that page.
  • System Configuration, Installation: Use the access control capabilities of your operating system and server environment and define your access control lists accordingly. Use a "default deny" policy when defining these ACLs.

References

Advisories

Packages

Other links

Timeline

  1. Published
  2. Last updated by the source
  3. Latest EPSS score
AdvisorySeverityWhy it's related
GHSA-2q2q-jr9g-v9rf
Weblate has IDOR in GroupViewSet that allows authenticated project manager to gain unauthorized read access to any private project
High Also affects weblate
GHSA-2p9g-x3cv-5hh4
Private Weblate projects vulnerable to observable object existence disclosure via globally scoped object lookups
Medium Also affects weblate
GHSA-vmfc-9982-2m45
Weblate SSRF: outbound URL guard misses some private ranges
Medium Also affects weblate
GHSA-6wxc-8mgq-w26m
Weblate: Stored HTML injection in editor search preview
Medium Also affects weblate
GHSA-5cmv-3rc4-7279
Weblate vulnerable to XSS via crafted Markdown
Medium Also affects weblate
GHSA-gcg5-86jr-f7jg
Weblate Vulnerable to Private Translation Enumeration via Screenshot API
Medium Also affects weblate
GHSA-cwcx-382v-8m9g
Weblate Vulnerable to Authenticated SSRF via Project Backup Import bypassing validate_repo_url
High Also affects weblate
GHSA-6j8j-4qp3-36p2
Weblate Doesn't Invalidate API Token on Password Change
Medium Also affects weblate
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