CVE-2026-3321 | ON24 Q&A Chat History answer authorization (EUVD-2026-17084)

VDB-354190 · CVE-2026-3321 · EUVD-2026-17084 ON24 Q&A CHAT HISTORY ANSWER AUTHORIZATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.3 $0-$5k 4.23+ Summaryinfo A vulnerability was found in ON24 Q&A Chat and classified as problematic. Affected by this issue is some unknown functionality of the file console-survey/api/v1/answer/ of the component History Handler. Executing a manipulation can lead to authorization. This vulnerability is registered as CVE-2026-3321. It is possible to launch the attack remotely. No exploit is available. Detailsinfo A vulnerability has been found in ON24 Q&A Chat (the affected version is unknown) and classified as problematic. This vulnerability affects an unknown code of the file console-survey/api/v1/answer/ of the component History Handler. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. As an impact it is known to affect confidentiality. CVE summarizes: A vulnerability of authorization bypass through user-controlled key in the 'console-survey/api/v1/answer/{EVENTID}/{TIMESTAMP}/' endpoint. Exploiting this vulnerability would allow an unauthenticated attacker to enumerate event IDs and obtain the complete Q&A history. This publicly exposed data may include IDs, private URLs, private messages, internal references, or other sensitive information that should only be exposed to authenticated users. In addition, the leaked content could be exploited to facilitate other malicious activities, such as reconnaissance for lateral movement, exploitation of related systems, or unauthorised access to internal applications referenced in the content of chat messages. The weakness was published by Samuel De Lucas Maroto. The advisory is available at incibe.es. This vulnerability was named CVE-2026-3321 since 02/27/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 03/30/2026). There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-17084). Productinfo Type Chat Software Vendor ON24 Name Q&A Chat CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 5.3 VulDB Meta Temp Score: 5.3 VulDB Base Score: 5.3 VulDB Temp Score: 5.3 VulDB Vector: 🔒 VulDB Reliability: 🔍 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-639 / CWE-285 / CWE-266 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: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 02/27/2026 CVE reserved 03/30/2026 +30 days Advisory disclosed 03/30/2026 +0 days VulDB entry created 03/30/2026 +0 days VulDB entry last update Sourcesinfo Advisory: incibe.es Researcher: Samuel De Lucas Maroto Status: Not defined CVE: CVE-2026-3321 (🔒) GCVE (CVE): GCVE-0-2026-3321 GCVE (VulDB): GCVE-100-354190 EUVD: 🔒 Entryinfo Created: 03/30/2026 15:43 Updated: 03/30/2026 17:21 Changes: 03/30/2026 15:43 (66), 03/30/2026 17:21 (1) Complete: 🔍 Cache ID: 99:A1E:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸