CVE-2026-25742 | Zulip up to 11.5 File Content authorization

VDB-355186 · CVE-2026-25742 · GCVE-0-2026-25742 ZULIP UP TO 11.5 FILE CONTENT AUTHORIZATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.2 $0-$5k 0.58+ Summaryinfo A vulnerability was found in Zulip up to 11.5. It has been declared as problematic. The impacted element is an unknown function of the component File Content Handler. Executing a manipulation can lead to authorization. This vulnerability is handled as CVE-2026-25742. The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component. Detailsinfo A vulnerability classified as problematic was found in Zulip up to 11.5. This vulnerability affects some unknown processing of the component File Content Handler. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality. CVE summarizes: Zulip is an open-source team collaboration tool. Prior to version 11.6, Zulip is an open-source team collaboration tool. From version 1.4.0 to before version 11.6, even after spectator access (enable_spectator_access / WEB_PUBLIC_STREAMS_ENABLED) is disabled, attachments originating from web-public streams can still be retrieved anonymously. As a result, file contents remain accessible even after public access is intended to be disabled. Similarly, even after spectator access is disabled, the /users/me//topics endpoint remains reachable anonymously, allowing retrieval of topic history for web-public streams. This issue has been patched in version 11.6. This issue has been patched in version 11.6. The advisory is available at github.com. This vulnerability was named CVE-2026-25742 since 02/05/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. Upgrading to version 11.6 eliminates this vulnerability. Productinfo Name Zulip Version 11.0 11.1 11.2 11.3 11.4 11.5 Website Product: https://github.com/zulip/zulip/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 5.3 VulDB Meta Temp Score: 5.2 VulDB Base Score: 5.3 VulDB Temp Score: 5.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 5.3 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Authorization CWE: CWE-862 / CWE-863 / CWE-285 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: Zulip 11.6 Timelineinfo 02/05/2026 CVE reserved 04/03/2026 +56 days Advisory disclosed 04/03/2026 +0 days VulDB entry created 04/03/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-25742 (🔒) GCVE (CVE): GCVE-0-2026-25742 GCVE (VulDB): GCVE-100-355186 Entryinfo Created: 04/03/2026 23:17 Changes: 04/03/2026 23:17 (62) Complete: 🔍 Cache ID: 99:D3F:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸