Pydio Cells up to 5.0.2 Share Link handler.go LinkById improper authorization

Summaryinfo

A vulnerability marked as problematic has been reported in Pydio Cells up to 5.0.2. This vulnerability affects the function LinkById of the file idm/share/rest/handler.go of the component Share Link. The manipulation leads to improper authorization. This vulnerability is referenced as CVE-2026-76032. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Pydio Cells up to 5.0.2 and classified as problematic. This issue affects the function LinkById of the file idm/share/rest/handler.go of the component Share Link. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality. The summary by CVE is:

Pydio Cells 5.0.0 through 5.0.2 returns share-link details to any authenticated user. The REST handler for GET /a/share/link/{Uuid} in idm/share/rest/handler.go reads the workspace UUID from the path, calls LinkById, and writes the result with no authorization step, whereas the sibling handler for GET /a/share/cell/{Uuid} loads the workspace and requires MatchPolicies with ResourcePolicyAction_READ, returning a not-found error so that existence is not disclosed. Nothing compensates further down: GetLinkWorkspace reaches GetOrCreateWorkspace, which issues SearchWorkspace with a query carrying no ResourcePolicyQuery, and PrepareResourcePolicyQuery returns the query unmodified when that field is nil, so the workspace service applies no policy filter. The workspace UUID is not secret, because the unauthenticated public page served for a share link embeds it as START_REPOSITORY. Any account holding a standard user role can therefore submit the UUID and receive the link hash and URL, the owner's user identifier, the hidden share user login, the permission set, the download limit and count, the target users, the expiry, and the password-required flag, while a direct read of the shared node from the same account is refused.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-76032 since 08/18/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/18/2026). The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Pydio

Name

• Cells

Version

• 5.0.0
• 5.0.1
• 5.0.2

Website

• Product: https://github.com/pydio/cells/

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