Microsoft Patches Critical Information Disclosure Flaw in Teams for Android (CVE-2026-42835)
On June 9, 2026, Microsoft disclosed a high-severity vulnerability in Microsoft Teams for Android (CVE-2026-42835) that could allow authenticated attackers to expose sensitive data remotely. The flaw, rated Important with a CVSS 3.1 base score of 8.1, stems from improper input sanitization (CWE-74), enabling attackers to extract small portions of heap memory without user interaction.
The vulnerability is remotely exploitable over the internet (AV:N) with low attack complexity (AC:L), meaning attackers require minimal system knowledge to craft a successful payload. While the flaw does not impact integrity, it poses high risks to confidentiality and availability, as heap memory may contain authentication tokens, session data, or cached credentials. Exploitation requires only low-privileged access, increasing the potential attack surface.
Microsoft’s assessment indicates exploitation is less likely, with no evidence of active attacks or public exploit code at the time of disclosure. The company has released a patch via the Google Play Store, urging users and enterprises to update immediately. The vulnerability was responsibly reported by Ofek Levin of Enclave through Microsoft’s coordinated disclosure program.
Given Teams’ role in enterprise communications, organizations handling sensitive data should prioritize applying the fix to mitigate exposure.
Source: https://cybersecuritynews.com/microsoft-teams-for-android-vulnerability/
Microsoft TPRM report: https://www.rankiteo.com/company/microsoft-security-response-center
"id": "mic1781238231",
"linkid": "microsoft-security-response-center",
"type": "Vulnerability",
"date": "6/2026",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"{'affected_entities': [{'industry': 'Technology',
'name': 'Microsoft',
'type': 'Corporation'}],
'attack_vector': 'Network',
'customer_advisories': 'Urged users and enterprises to update immediately via '
'Google Play Store.',
'data_breach': {'sensitivity_of_data': 'High',
'type_of_data_compromised': 'Heap memory (authentication '
'tokens, session data, cached '
'credentials)'},
'date_publicly_disclosed': '2026-06-09',
'description': 'On June 9, 2026, Microsoft disclosed a high-severity '
'vulnerability in Microsoft Teams for Android (CVE-2026-42835) '
'that could allow authenticated attackers to expose sensitive '
'data remotely. The flaw, rated Important with a CVSS 3.1 base '
'score of 8.1, stems from improper input sanitization '
'(CWE-74), enabling attackers to extract small portions of '
'heap memory without user interaction.',
'impact': {'data_compromised': 'Heap memory (may contain authentication '
'tokens, session data, or cached credentials)',
'systems_affected': 'Microsoft Teams for Android'},
'investigation_status': 'Patched',
'post_incident_analysis': {'corrective_actions': 'Patch released to fix the '
'vulnerability',
'root_causes': 'Improper input sanitization '
'(CWE-74)'},
'recommendations': 'Organizations handling sensitive data should prioritize '
'applying the fix to mitigate exposure.',
'references': [{'source': 'Microsoft Security Response Center'},
{'source': 'Ofek Levin of Enclave'}],
'response': {'communication_strategy': 'Public disclosure and advisory urging '
'users to update',
'containment_measures': 'Patch released via Google Play Store',
'remediation_measures': 'Update Microsoft Teams for Android'},
'title': 'Microsoft Patches Critical Information Disclosure Flaw in Teams for '
'Android (CVE-2026-42835)',
'type': 'Information Disclosure',
'vulnerability_exploited': 'Improper input sanitization (CWE-74)'}